Valid Badminton Score?












20












$begingroup$


Introduction:



I saw there was only one other badminton related challenge right now. Since I play badminton myself (for the past 13 years now), I figured I'd add some badminton-related challenges. Here the first one:



Challenge:



Input: Two integers
Output: One of three distinct and unique outputs of your own choice. One indicating that the input is a valid badminton score AND the set has ended with a winner; one indicating that the input is a valid badminton score AND the set is still in play; one indicating the input is not a valid badminton score.



With badminton, both (pairs of) players start with 0 points, and you stop when one of the two (pairs of) players has reached a score of 21, with at least 2 points difference, up to a maximum of 30-29.



So these are all possible input-pairs (in either order) indicating it's a valid badminton score AND the set has ended:



[[0,21],[1,21],[2,21],[3,21],[4,21],[5,21],[6,21],[7,21],[8,21],[9,21],[10,21],[11,21],[12,21],[13,21],[14,21],[15,21],[16,21],[17,21],[18,21],[19,21],[20,22],[21,23],[22,24],[23,25],[24,26],[25,27],[26,28],[27,29],[28,30],[29,30]]


And these are all possible input-pairs (in either order) indicating it's a valid badminton score BUT the set is still in play:



[[0,0],[0,1],[0,2],[0,3],[0,4],[0,5],[0,6],[0,7],[0,8],[0,9],[0,10],[0,11],[0,12],[0,13],[0,14],[0,15],[0,16],[0,17],[0,18],[0,19],[0,20],[1,1],[1,2],[1,3],[1,4],[1,5],[1,6],[1,7],[1,8],[1,9],[1,10],[1,11],[1,12],[1,13],[1,14],[1,15],[1,16],[1,17],[1,18],[1,19],[1,20],[2,2],[2,3],[2,4],[2,5],[2,6],[2,7],[2,8],[2,9],[2,10],[2,11],[2,12],[2,13],[2,14],[2,15],[2,16],[2,17],[2,18],[2,19],[2,20],[3,3],[3,4],[3,5],[3,6],[3,7],[3,8],[3,9],[3,10],[3,11],[3,12],[3,13],[3,14],[3,15],[3,16],[3,17],[3,18],[3,19],[3,20],[4,4],[4,5],[4,6],[4,7],[4,8],[4,9],[4,10],[4,11],[4,12],[4,13],[4,14],[4,15],[4,16],[4,17],[4,18],[4,19],[4,20],[5,5],[5,6],[5,7],[5,8],[5,9],[5,10],[5,11],[5,12],[5,13],[5,14],[5,15],[5,16],[5,17],[5,18],[5,19],[5,20],[6,6],[6,7],[6,8],[6,9],[6,10],[6,11],[6,12],[6,13],[6,14],[6,15],[6,16],[6,17],[6,18],[6,19],[6,20],[7,7],[7,8],[7,9],[7,10],[7,11],[7,12],[7,13],[7,14],[7,15],[7,16],[7,17],[7,18],[7,19],[7,20],[8,8],[8,9],[8,10],[8,11],[8,12],[8,13],[8,14],[8,15],[8,16],[8,17],[8,18],[8,19],[8,20],[9,9],[9,10],[9,11],[9,12],[9,13],[9,14],[9,15],[9,16],[9,17],[9,18],[9,19],[9,20],[10,10],[10,11],[10,12],[10,13],[10,14],[10,15],[10,16],[10,17],[10,18],[10,19],[10,20],[11,11],[11,12],[11,13],[11,14],[11,15],[11,16],[11,17],[11,18],[11,19],[11,20],[12,12],[12,13],[12,14],[12,15],[12,16],[12,17],[12,18],[12,19],[12,20],[13,13],[13,14],[13,15],[13,16],[13,17],[13,18],[13,19],[13,20],[14,14],[14,15],[14,16],[14,17],[14,18],[14,19],[14,20],[15,15],[15,16],[15,17],[15,18],[15,19],[15,20],[16,16],[16,17],[16,18],[16,19],[16,20],[17,17],[17,18],[17,19],[17,20],[18,18],[18,19],[18,20],[19,19],[19,20],[20,20],[20,21],[21,21],[21,22],[22,22],[22,23],[23,23],[23,24],[24,24],[24,25],[25,25],[25,26],[26,26],[26,27],[27,27],[27,28],[28,28],[28,29],[29,29]]


Any other pair of integer would be an invalid badminton score.



Challenge rules:




  • I/O is flexible, so:


    • You can take the input as a list of two numbers; two separated numbers through STDIN or function parameters; two strings; etc.

    • Output will be three distinct and unique values of your own choice. Can be integers (i.e. [0,1,2], [1,2,3], [-1,0,1], etc.); can be Booleans (i.e. [true,false,undefined/null/empty]); can be characters/strings (i.e. ["valid & ended","valid","invalid"]); etc.

    • Please specify the I/O you've used in your answer!



  • You are allowed to take the input-integers pre-ordered from lowest to highest or vice-versa.

  • The input integers can be negative, in which case they are of course invalid.


General rules:




  • This is code-golf, so shortest answer in bytes wins.

    Don't let code-golf languages discourage you from posting answers with non-codegolfing languages. Try to come up with an as short as possible answer for 'any' programming language.


  • Standard rules apply for your answer with default I/O rules, so you are allowed to use STDIN/STDOUT, functions/method with the proper parameters and return-type, full programs. Your call.


  • Default Loopholes are forbidden.

  • If possible, please add a link with a test for your code (i.e. TIO).

  • Also, adding an explanation for your answer is highly recommended.


Test cases:



These test cases are valid, and the set has ended:



0 21
12 21
21 23
28 30
29 30


These test cases are valid, but the set is still in play:



0 0
0 20
12 12
21 21
21 22


These test cases are invalid:



-21 19
-19 21
-1 1
12 22
29 31
30 30
42 43
1021 1021









share|improve this question











$endgroup$

















    20












    $begingroup$


    Introduction:



    I saw there was only one other badminton related challenge right now. Since I play badminton myself (for the past 13 years now), I figured I'd add some badminton-related challenges. Here the first one:



    Challenge:



    Input: Two integers
    Output: One of three distinct and unique outputs of your own choice. One indicating that the input is a valid badminton score AND the set has ended with a winner; one indicating that the input is a valid badminton score AND the set is still in play; one indicating the input is not a valid badminton score.



    With badminton, both (pairs of) players start with 0 points, and you stop when one of the two (pairs of) players has reached a score of 21, with at least 2 points difference, up to a maximum of 30-29.



    So these are all possible input-pairs (in either order) indicating it's a valid badminton score AND the set has ended:



    [[0,21],[1,21],[2,21],[3,21],[4,21],[5,21],[6,21],[7,21],[8,21],[9,21],[10,21],[11,21],[12,21],[13,21],[14,21],[15,21],[16,21],[17,21],[18,21],[19,21],[20,22],[21,23],[22,24],[23,25],[24,26],[25,27],[26,28],[27,29],[28,30],[29,30]]


    And these are all possible input-pairs (in either order) indicating it's a valid badminton score BUT the set is still in play:



    [[0,0],[0,1],[0,2],[0,3],[0,4],[0,5],[0,6],[0,7],[0,8],[0,9],[0,10],[0,11],[0,12],[0,13],[0,14],[0,15],[0,16],[0,17],[0,18],[0,19],[0,20],[1,1],[1,2],[1,3],[1,4],[1,5],[1,6],[1,7],[1,8],[1,9],[1,10],[1,11],[1,12],[1,13],[1,14],[1,15],[1,16],[1,17],[1,18],[1,19],[1,20],[2,2],[2,3],[2,4],[2,5],[2,6],[2,7],[2,8],[2,9],[2,10],[2,11],[2,12],[2,13],[2,14],[2,15],[2,16],[2,17],[2,18],[2,19],[2,20],[3,3],[3,4],[3,5],[3,6],[3,7],[3,8],[3,9],[3,10],[3,11],[3,12],[3,13],[3,14],[3,15],[3,16],[3,17],[3,18],[3,19],[3,20],[4,4],[4,5],[4,6],[4,7],[4,8],[4,9],[4,10],[4,11],[4,12],[4,13],[4,14],[4,15],[4,16],[4,17],[4,18],[4,19],[4,20],[5,5],[5,6],[5,7],[5,8],[5,9],[5,10],[5,11],[5,12],[5,13],[5,14],[5,15],[5,16],[5,17],[5,18],[5,19],[5,20],[6,6],[6,7],[6,8],[6,9],[6,10],[6,11],[6,12],[6,13],[6,14],[6,15],[6,16],[6,17],[6,18],[6,19],[6,20],[7,7],[7,8],[7,9],[7,10],[7,11],[7,12],[7,13],[7,14],[7,15],[7,16],[7,17],[7,18],[7,19],[7,20],[8,8],[8,9],[8,10],[8,11],[8,12],[8,13],[8,14],[8,15],[8,16],[8,17],[8,18],[8,19],[8,20],[9,9],[9,10],[9,11],[9,12],[9,13],[9,14],[9,15],[9,16],[9,17],[9,18],[9,19],[9,20],[10,10],[10,11],[10,12],[10,13],[10,14],[10,15],[10,16],[10,17],[10,18],[10,19],[10,20],[11,11],[11,12],[11,13],[11,14],[11,15],[11,16],[11,17],[11,18],[11,19],[11,20],[12,12],[12,13],[12,14],[12,15],[12,16],[12,17],[12,18],[12,19],[12,20],[13,13],[13,14],[13,15],[13,16],[13,17],[13,18],[13,19],[13,20],[14,14],[14,15],[14,16],[14,17],[14,18],[14,19],[14,20],[15,15],[15,16],[15,17],[15,18],[15,19],[15,20],[16,16],[16,17],[16,18],[16,19],[16,20],[17,17],[17,18],[17,19],[17,20],[18,18],[18,19],[18,20],[19,19],[19,20],[20,20],[20,21],[21,21],[21,22],[22,22],[22,23],[23,23],[23,24],[24,24],[24,25],[25,25],[25,26],[26,26],[26,27],[27,27],[27,28],[28,28],[28,29],[29,29]]


    Any other pair of integer would be an invalid badminton score.



    Challenge rules:




    • I/O is flexible, so:


      • You can take the input as a list of two numbers; two separated numbers through STDIN or function parameters; two strings; etc.

      • Output will be three distinct and unique values of your own choice. Can be integers (i.e. [0,1,2], [1,2,3], [-1,0,1], etc.); can be Booleans (i.e. [true,false,undefined/null/empty]); can be characters/strings (i.e. ["valid & ended","valid","invalid"]); etc.

      • Please specify the I/O you've used in your answer!



    • You are allowed to take the input-integers pre-ordered from lowest to highest or vice-versa.

    • The input integers can be negative, in which case they are of course invalid.


    General rules:




    • This is code-golf, so shortest answer in bytes wins.

      Don't let code-golf languages discourage you from posting answers with non-codegolfing languages. Try to come up with an as short as possible answer for 'any' programming language.


    • Standard rules apply for your answer with default I/O rules, so you are allowed to use STDIN/STDOUT, functions/method with the proper parameters and return-type, full programs. Your call.


    • Default Loopholes are forbidden.

    • If possible, please add a link with a test for your code (i.e. TIO).

    • Also, adding an explanation for your answer is highly recommended.


    Test cases:



    These test cases are valid, and the set has ended:



    0 21
    12 21
    21 23
    28 30
    29 30


    These test cases are valid, but the set is still in play:



    0 0
    0 20
    12 12
    21 21
    21 22


    These test cases are invalid:



    -21 19
    -19 21
    -1 1
    12 22
    29 31
    30 30
    42 43
    1021 1021









    share|improve this question











    $endgroup$















      20












      20








      20


      1



      $begingroup$


      Introduction:



      I saw there was only one other badminton related challenge right now. Since I play badminton myself (for the past 13 years now), I figured I'd add some badminton-related challenges. Here the first one:



      Challenge:



      Input: Two integers
      Output: One of three distinct and unique outputs of your own choice. One indicating that the input is a valid badminton score AND the set has ended with a winner; one indicating that the input is a valid badminton score AND the set is still in play; one indicating the input is not a valid badminton score.



      With badminton, both (pairs of) players start with 0 points, and you stop when one of the two (pairs of) players has reached a score of 21, with at least 2 points difference, up to a maximum of 30-29.



      So these are all possible input-pairs (in either order) indicating it's a valid badminton score AND the set has ended:



      [[0,21],[1,21],[2,21],[3,21],[4,21],[5,21],[6,21],[7,21],[8,21],[9,21],[10,21],[11,21],[12,21],[13,21],[14,21],[15,21],[16,21],[17,21],[18,21],[19,21],[20,22],[21,23],[22,24],[23,25],[24,26],[25,27],[26,28],[27,29],[28,30],[29,30]]


      And these are all possible input-pairs (in either order) indicating it's a valid badminton score BUT the set is still in play:



      [[0,0],[0,1],[0,2],[0,3],[0,4],[0,5],[0,6],[0,7],[0,8],[0,9],[0,10],[0,11],[0,12],[0,13],[0,14],[0,15],[0,16],[0,17],[0,18],[0,19],[0,20],[1,1],[1,2],[1,3],[1,4],[1,5],[1,6],[1,7],[1,8],[1,9],[1,10],[1,11],[1,12],[1,13],[1,14],[1,15],[1,16],[1,17],[1,18],[1,19],[1,20],[2,2],[2,3],[2,4],[2,5],[2,6],[2,7],[2,8],[2,9],[2,10],[2,11],[2,12],[2,13],[2,14],[2,15],[2,16],[2,17],[2,18],[2,19],[2,20],[3,3],[3,4],[3,5],[3,6],[3,7],[3,8],[3,9],[3,10],[3,11],[3,12],[3,13],[3,14],[3,15],[3,16],[3,17],[3,18],[3,19],[3,20],[4,4],[4,5],[4,6],[4,7],[4,8],[4,9],[4,10],[4,11],[4,12],[4,13],[4,14],[4,15],[4,16],[4,17],[4,18],[4,19],[4,20],[5,5],[5,6],[5,7],[5,8],[5,9],[5,10],[5,11],[5,12],[5,13],[5,14],[5,15],[5,16],[5,17],[5,18],[5,19],[5,20],[6,6],[6,7],[6,8],[6,9],[6,10],[6,11],[6,12],[6,13],[6,14],[6,15],[6,16],[6,17],[6,18],[6,19],[6,20],[7,7],[7,8],[7,9],[7,10],[7,11],[7,12],[7,13],[7,14],[7,15],[7,16],[7,17],[7,18],[7,19],[7,20],[8,8],[8,9],[8,10],[8,11],[8,12],[8,13],[8,14],[8,15],[8,16],[8,17],[8,18],[8,19],[8,20],[9,9],[9,10],[9,11],[9,12],[9,13],[9,14],[9,15],[9,16],[9,17],[9,18],[9,19],[9,20],[10,10],[10,11],[10,12],[10,13],[10,14],[10,15],[10,16],[10,17],[10,18],[10,19],[10,20],[11,11],[11,12],[11,13],[11,14],[11,15],[11,16],[11,17],[11,18],[11,19],[11,20],[12,12],[12,13],[12,14],[12,15],[12,16],[12,17],[12,18],[12,19],[12,20],[13,13],[13,14],[13,15],[13,16],[13,17],[13,18],[13,19],[13,20],[14,14],[14,15],[14,16],[14,17],[14,18],[14,19],[14,20],[15,15],[15,16],[15,17],[15,18],[15,19],[15,20],[16,16],[16,17],[16,18],[16,19],[16,20],[17,17],[17,18],[17,19],[17,20],[18,18],[18,19],[18,20],[19,19],[19,20],[20,20],[20,21],[21,21],[21,22],[22,22],[22,23],[23,23],[23,24],[24,24],[24,25],[25,25],[25,26],[26,26],[26,27],[27,27],[27,28],[28,28],[28,29],[29,29]]


      Any other pair of integer would be an invalid badminton score.



      Challenge rules:




      • I/O is flexible, so:


        • You can take the input as a list of two numbers; two separated numbers through STDIN or function parameters; two strings; etc.

        • Output will be three distinct and unique values of your own choice. Can be integers (i.e. [0,1,2], [1,2,3], [-1,0,1], etc.); can be Booleans (i.e. [true,false,undefined/null/empty]); can be characters/strings (i.e. ["valid & ended","valid","invalid"]); etc.

        • Please specify the I/O you've used in your answer!



      • You are allowed to take the input-integers pre-ordered from lowest to highest or vice-versa.

      • The input integers can be negative, in which case they are of course invalid.


      General rules:




      • This is code-golf, so shortest answer in bytes wins.

        Don't let code-golf languages discourage you from posting answers with non-codegolfing languages. Try to come up with an as short as possible answer for 'any' programming language.


      • Standard rules apply for your answer with default I/O rules, so you are allowed to use STDIN/STDOUT, functions/method with the proper parameters and return-type, full programs. Your call.


      • Default Loopholes are forbidden.

      • If possible, please add a link with a test for your code (i.e. TIO).

      • Also, adding an explanation for your answer is highly recommended.


      Test cases:



      These test cases are valid, and the set has ended:



      0 21
      12 21
      21 23
      28 30
      29 30


      These test cases are valid, but the set is still in play:



      0 0
      0 20
      12 12
      21 21
      21 22


      These test cases are invalid:



      -21 19
      -19 21
      -1 1
      12 22
      29 31
      30 30
      42 43
      1021 1021









      share|improve this question











      $endgroup$




      Introduction:



      I saw there was only one other badminton related challenge right now. Since I play badminton myself (for the past 13 years now), I figured I'd add some badminton-related challenges. Here the first one:



      Challenge:



      Input: Two integers
      Output: One of three distinct and unique outputs of your own choice. One indicating that the input is a valid badminton score AND the set has ended with a winner; one indicating that the input is a valid badminton score AND the set is still in play; one indicating the input is not a valid badminton score.



      With badminton, both (pairs of) players start with 0 points, and you stop when one of the two (pairs of) players has reached a score of 21, with at least 2 points difference, up to a maximum of 30-29.



      So these are all possible input-pairs (in either order) indicating it's a valid badminton score AND the set has ended:



      [[0,21],[1,21],[2,21],[3,21],[4,21],[5,21],[6,21],[7,21],[8,21],[9,21],[10,21],[11,21],[12,21],[13,21],[14,21],[15,21],[16,21],[17,21],[18,21],[19,21],[20,22],[21,23],[22,24],[23,25],[24,26],[25,27],[26,28],[27,29],[28,30],[29,30]]


      And these are all possible input-pairs (in either order) indicating it's a valid badminton score BUT the set is still in play:



      [[0,0],[0,1],[0,2],[0,3],[0,4],[0,5],[0,6],[0,7],[0,8],[0,9],[0,10],[0,11],[0,12],[0,13],[0,14],[0,15],[0,16],[0,17],[0,18],[0,19],[0,20],[1,1],[1,2],[1,3],[1,4],[1,5],[1,6],[1,7],[1,8],[1,9],[1,10],[1,11],[1,12],[1,13],[1,14],[1,15],[1,16],[1,17],[1,18],[1,19],[1,20],[2,2],[2,3],[2,4],[2,5],[2,6],[2,7],[2,8],[2,9],[2,10],[2,11],[2,12],[2,13],[2,14],[2,15],[2,16],[2,17],[2,18],[2,19],[2,20],[3,3],[3,4],[3,5],[3,6],[3,7],[3,8],[3,9],[3,10],[3,11],[3,12],[3,13],[3,14],[3,15],[3,16],[3,17],[3,18],[3,19],[3,20],[4,4],[4,5],[4,6],[4,7],[4,8],[4,9],[4,10],[4,11],[4,12],[4,13],[4,14],[4,15],[4,16],[4,17],[4,18],[4,19],[4,20],[5,5],[5,6],[5,7],[5,8],[5,9],[5,10],[5,11],[5,12],[5,13],[5,14],[5,15],[5,16],[5,17],[5,18],[5,19],[5,20],[6,6],[6,7],[6,8],[6,9],[6,10],[6,11],[6,12],[6,13],[6,14],[6,15],[6,16],[6,17],[6,18],[6,19],[6,20],[7,7],[7,8],[7,9],[7,10],[7,11],[7,12],[7,13],[7,14],[7,15],[7,16],[7,17],[7,18],[7,19],[7,20],[8,8],[8,9],[8,10],[8,11],[8,12],[8,13],[8,14],[8,15],[8,16],[8,17],[8,18],[8,19],[8,20],[9,9],[9,10],[9,11],[9,12],[9,13],[9,14],[9,15],[9,16],[9,17],[9,18],[9,19],[9,20],[10,10],[10,11],[10,12],[10,13],[10,14],[10,15],[10,16],[10,17],[10,18],[10,19],[10,20],[11,11],[11,12],[11,13],[11,14],[11,15],[11,16],[11,17],[11,18],[11,19],[11,20],[12,12],[12,13],[12,14],[12,15],[12,16],[12,17],[12,18],[12,19],[12,20],[13,13],[13,14],[13,15],[13,16],[13,17],[13,18],[13,19],[13,20],[14,14],[14,15],[14,16],[14,17],[14,18],[14,19],[14,20],[15,15],[15,16],[15,17],[15,18],[15,19],[15,20],[16,16],[16,17],[16,18],[16,19],[16,20],[17,17],[17,18],[17,19],[17,20],[18,18],[18,19],[18,20],[19,19],[19,20],[20,20],[20,21],[21,21],[21,22],[22,22],[22,23],[23,23],[23,24],[24,24],[24,25],[25,25],[25,26],[26,26],[26,27],[27,27],[27,28],[28,28],[28,29],[29,29]]


      Any other pair of integer would be an invalid badminton score.



      Challenge rules:




      • I/O is flexible, so:


        • You can take the input as a list of two numbers; two separated numbers through STDIN or function parameters; two strings; etc.

        • Output will be three distinct and unique values of your own choice. Can be integers (i.e. [0,1,2], [1,2,3], [-1,0,1], etc.); can be Booleans (i.e. [true,false,undefined/null/empty]); can be characters/strings (i.e. ["valid & ended","valid","invalid"]); etc.

        • Please specify the I/O you've used in your answer!



      • You are allowed to take the input-integers pre-ordered from lowest to highest or vice-versa.

      • The input integers can be negative, in which case they are of course invalid.


      General rules:




      • This is code-golf, so shortest answer in bytes wins.

        Don't let code-golf languages discourage you from posting answers with non-codegolfing languages. Try to come up with an as short as possible answer for 'any' programming language.


      • Standard rules apply for your answer with default I/O rules, so you are allowed to use STDIN/STDOUT, functions/method with the proper parameters and return-type, full programs. Your call.


      • Default Loopholes are forbidden.

      • If possible, please add a link with a test for your code (i.e. TIO).

      • Also, adding an explanation for your answer is highly recommended.


      Test cases:



      These test cases are valid, and the set has ended:



      0 21
      12 21
      21 23
      28 30
      29 30


      These test cases are valid, but the set is still in play:



      0 0
      0 20
      12 12
      21 21
      21 22


      These test cases are invalid:



      -21 19
      -19 21
      -1 1
      12 22
      29 31
      30 30
      42 43
      1021 1021






      code-golf number integer






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 15 hours ago







      Kevin Cruijssen

















      asked 16 hours ago









      Kevin CruijssenKevin Cruijssen

      41.6k567215




      41.6k567215






















          8 Answers
          8






          active

          oldest

          votes


















          4












          $begingroup$


          Jelly, 25 bytes



          »19«28‘<‘×+2>ɗʋ⁹×,%Ƒ“œþ‘ɗ


          Try it online!



          Left argument: minimum. Right argument: maximum.

          Invalid: 0. Ongoing: 1. Ended: 2.






          share|improve this answer











          $endgroup$





















            4












            $begingroup$


            C# (Visual C# Interactive Compiler), 53 52 bytes





            a=>b=>b<0|a-b>2&a>21|b>29|a>30?3:a>20&a-b>1|a>29?1:2


            Called as f(max)(min). Returns 3 for invalid, 1 for finished, 2 for ongoing.



            Saved 1 byte thanks to Kevin Cruijjsen



            Try it online!






            share|improve this answer











            $endgroup$





















              4












              $begingroup$


              Python 2, 97 95 75 72 71 70 69 bytes





              lambda a,b:(-1<a<=b<22or 0<a>b-3<b<31>a+1)and(20<b-(b<30)>a)+(a<20<b)


              Try it online!



              Takes input as pre-ordered a,b.



              Returns 1, 0, False for ended, in play, invalid.



              -1 byte, thanks to Kevin Cruijssen






              share|improve this answer











              $endgroup$





















                3












                $begingroup$

                JavaScript (ES6),  55 53  48 bytes



                Thanks to @KevinCruijssen for noticing that I was not fully assuming $ale b$ (saving 5 bytes)



                Takes input as (a)(b) with $ale b$. Returns $0$ (valid), $1$ (ended) or $2$ (invalid).





                a=>b=>a<0|a>29|b>30|b>21&b-a>2?2:b>20&b-a>1|b>29


                Try it online!






                share|improve this answer











                $endgroup$





















                  2












                  $begingroup$


                  VDM-SL, 80 bytes





                  f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)} 


                  This function takes the scores ordered in ascending order and returns the empty set if the score is invalid or the set containing whether the set is complete (so {true} if the set is complete and valid and {false} if the set is incomplete and valid)



                  A full program to run might look like this:



                  functions
                  f:int*int+>set of bool
                  f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)}


                  Explanation:



                  if(j-i>2 and j>21)             /*if scores are too far apart*/
                  or(i<0 or i=30 or j>30) /*or scores not in a valid range*/
                  then {} /*return the empty set*/
                  else{ } /*else return the set containing...*/
                  (j>20 and j-i>1 or j=30) /*if the set is complete*/





                  share|improve this answer









                  $endgroup$





















                    2












                    $begingroup$


                    Java (JDK), 59 48 bytes





                    a->b->b<0|b>29|a>b+2&a>21|a>30?0:a<21|a<30&a<b+2


                    Try it online!



                    Returns an Object, which is the Integer 0 for invalid games and the Booleans true and false for valid ongoing games and for valid finished games respectively. Takes the score ordered (and curried), with the higher score first.



                    -2 bytes by inverting the end-of-match check.
                    -11 bytes by currying, using bitwise operators, and some return type autoboxing trickery - thanks to @KevinCruijssen



                    Ungolfed



                    a->                      // Curried: Target type IntFunction<IntFunction<Object>>
                    b-> // Target type IntFunction<Object>
                    // Invalid if:
                    b<0 // Any score is negative
                    | b > 29 // Both scores above 29
                    | a > b + 2 // Lead too big
                    & a > 21 // and leader has at least 21 points
                    | a > 30 // Anyone has 31 points
                    ? 0 // If invalid, return 0 (autoboxed to Integer)
                    // If valid, return whether the game is ongoing (autoboxed to Boolean)
                    // Ongoing if:
                    : a < 21 // Nobody has 21 points
                    | a < 30 // Leader has fewer than 30 points
                    & a < b + 2 // and lead is small





                    share|improve this answer











                    $endgroup$





















                      2












                      $begingroup$


                      Python 2, 47 bytes





                      lambda a,b:[61>60-a>b<3+max(19,a)for b in-~b,b]


                      Try it online!



                      Outputs a list of two Booleans. Thanks to TFeld for writing a test suite in their answer that made it easy to check my solution.



                      ended: [False, True]
                      going: [True, True]
                      invalid: [False, False]


                      The key insight is that a valid score ends the game exactly if increasing the higher value b makes the score invalid. So, we just code up the validity condition, and check it for (a,b+1) in addition to (a,b) to see if the game has ended.



                      Validity is checked via three conditions that are chained together:





                      • b<3+max(19,a): Checks that the higher score b isn't past winning, with either b<=21 or b<=a+2 (win by two)


                      • 60-a>b: Equivalent to a+b<=59, ensuring the score isn't above (29,30)


                      • 61>60-a: Equivalent to a>=0, ensures the lower score is non-negative





                      Python 2, 43 bytes





                      lambda a,b:a>>99|cmp(2+max(19,a)%30-a/29,b)


                      Try it online!



                      Outputs:



                      ended: 0
                      going: -1
                      invalid: 1


                      Assumes that the inputs are not below $-2^{99}$.






                      share|improve this answer











                      $endgroup$





















                        1












                        $begingroup$


                        Retina 0.8.2, 92 bytes



                        d+
                        $*
                        ^(1{0,19},1{21}|(1{20,28}),112|1{29},1{30})$|^(1*,1{0,20}|(1{0,28}),1?4)$|.+
                        $#1$#3


                        Try it online! Link includes test cases. Takes input in ascending order. Explanation: The first stage simply converts from decimal to unary so that the scores can be properly compared. The second stage contains six alternate patterns, grouped into three groups so that three distinct values can be output, which are 10 for win, 01 for ongoing and 00 for illegal. The patterns are:




                        • Against 0-19, a score of 21 is a win

                        • Against 20-28, a score of +2 is a win

                        • Against 29, a score of 30 is a win

                        • Against any (lower) score, a score of 0-20 is ongoing

                        • Against a score of up to 28, a score of +1 is ongoing

                        • Anything else (including negative scores) is illegal






                        share|improve this answer









                        $endgroup$













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                          8 Answers
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                          4












                          $begingroup$


                          Jelly, 25 bytes



                          »19«28‘<‘×+2>ɗʋ⁹×,%Ƒ“œþ‘ɗ


                          Try it online!



                          Left argument: minimum. Right argument: maximum.

                          Invalid: 0. Ongoing: 1. Ended: 2.






                          share|improve this answer











                          $endgroup$


















                            4












                            $begingroup$


                            Jelly, 25 bytes



                            »19«28‘<‘×+2>ɗʋ⁹×,%Ƒ“œþ‘ɗ


                            Try it online!



                            Left argument: minimum. Right argument: maximum.

                            Invalid: 0. Ongoing: 1. Ended: 2.






                            share|improve this answer











                            $endgroup$
















                              4












                              4








                              4





                              $begingroup$


                              Jelly, 25 bytes



                              »19«28‘<‘×+2>ɗʋ⁹×,%Ƒ“œþ‘ɗ


                              Try it online!



                              Left argument: minimum. Right argument: maximum.

                              Invalid: 0. Ongoing: 1. Ended: 2.






                              share|improve this answer











                              $endgroup$




                              Jelly, 25 bytes



                              »19«28‘<‘×+2>ɗʋ⁹×,%Ƒ“œþ‘ɗ


                              Try it online!



                              Left argument: minimum. Right argument: maximum.

                              Invalid: 0. Ongoing: 1. Ended: 2.







                              share|improve this answer














                              share|improve this answer



                              share|improve this answer








                              edited 13 hours ago

























                              answered 14 hours ago









                              Erik the OutgolferErik the Outgolfer

                              32.8k429105




                              32.8k429105























                                  4












                                  $begingroup$


                                  C# (Visual C# Interactive Compiler), 53 52 bytes





                                  a=>b=>b<0|a-b>2&a>21|b>29|a>30?3:a>20&a-b>1|a>29?1:2


                                  Called as f(max)(min). Returns 3 for invalid, 1 for finished, 2 for ongoing.



                                  Saved 1 byte thanks to Kevin Cruijjsen



                                  Try it online!






                                  share|improve this answer











                                  $endgroup$


















                                    4












                                    $begingroup$


                                    C# (Visual C# Interactive Compiler), 53 52 bytes





                                    a=>b=>b<0|a-b>2&a>21|b>29|a>30?3:a>20&a-b>1|a>29?1:2


                                    Called as f(max)(min). Returns 3 for invalid, 1 for finished, 2 for ongoing.



                                    Saved 1 byte thanks to Kevin Cruijjsen



                                    Try it online!






                                    share|improve this answer











                                    $endgroup$
















                                      4












                                      4








                                      4





                                      $begingroup$


                                      C# (Visual C# Interactive Compiler), 53 52 bytes





                                      a=>b=>b<0|a-b>2&a>21|b>29|a>30?3:a>20&a-b>1|a>29?1:2


                                      Called as f(max)(min). Returns 3 for invalid, 1 for finished, 2 for ongoing.



                                      Saved 1 byte thanks to Kevin Cruijjsen



                                      Try it online!






                                      share|improve this answer











                                      $endgroup$




                                      C# (Visual C# Interactive Compiler), 53 52 bytes





                                      a=>b=>b<0|a-b>2&a>21|b>29|a>30?3:a>20&a-b>1|a>29?1:2


                                      Called as f(max)(min). Returns 3 for invalid, 1 for finished, 2 for ongoing.



                                      Saved 1 byte thanks to Kevin Cruijjsen



                                      Try it online!







                                      share|improve this answer














                                      share|improve this answer



                                      share|improve this answer








                                      edited 13 hours ago

























                                      answered 13 hours ago









                                      Embodiment of IgnoranceEmbodiment of Ignorance

                                      2,208125




                                      2,208125























                                          4












                                          $begingroup$


                                          Python 2, 97 95 75 72 71 70 69 bytes





                                          lambda a,b:(-1<a<=b<22or 0<a>b-3<b<31>a+1)and(20<b-(b<30)>a)+(a<20<b)


                                          Try it online!



                                          Takes input as pre-ordered a,b.



                                          Returns 1, 0, False for ended, in play, invalid.



                                          -1 byte, thanks to Kevin Cruijssen






                                          share|improve this answer











                                          $endgroup$


















                                            4












                                            $begingroup$


                                            Python 2, 97 95 75 72 71 70 69 bytes





                                            lambda a,b:(-1<a<=b<22or 0<a>b-3<b<31>a+1)and(20<b-(b<30)>a)+(a<20<b)


                                            Try it online!



                                            Takes input as pre-ordered a,b.



                                            Returns 1, 0, False for ended, in play, invalid.



                                            -1 byte, thanks to Kevin Cruijssen






                                            share|improve this answer











                                            $endgroup$
















                                              4












                                              4








                                              4





                                              $begingroup$


                                              Python 2, 97 95 75 72 71 70 69 bytes





                                              lambda a,b:(-1<a<=b<22or 0<a>b-3<b<31>a+1)and(20<b-(b<30)>a)+(a<20<b)


                                              Try it online!



                                              Takes input as pre-ordered a,b.



                                              Returns 1, 0, False for ended, in play, invalid.



                                              -1 byte, thanks to Kevin Cruijssen






                                              share|improve this answer











                                              $endgroup$




                                              Python 2, 97 95 75 72 71 70 69 bytes





                                              lambda a,b:(-1<a<=b<22or 0<a>b-3<b<31>a+1)and(20<b-(b<30)>a)+(a<20<b)


                                              Try it online!



                                              Takes input as pre-ordered a,b.



                                              Returns 1, 0, False for ended, in play, invalid.



                                              -1 byte, thanks to Kevin Cruijssen







                                              share|improve this answer














                                              share|improve this answer



                                              share|improve this answer








                                              edited 23 mins ago

























                                              answered 15 hours ago









                                              TFeldTFeld

                                              16.1k21449




                                              16.1k21449























                                                  3












                                                  $begingroup$

                                                  JavaScript (ES6),  55 53  48 bytes



                                                  Thanks to @KevinCruijssen for noticing that I was not fully assuming $ale b$ (saving 5 bytes)



                                                  Takes input as (a)(b) with $ale b$. Returns $0$ (valid), $1$ (ended) or $2$ (invalid).





                                                  a=>b=>a<0|a>29|b>30|b>21&b-a>2?2:b>20&b-a>1|b>29


                                                  Try it online!






                                                  share|improve this answer











                                                  $endgroup$


















                                                    3












                                                    $begingroup$

                                                    JavaScript (ES6),  55 53  48 bytes



                                                    Thanks to @KevinCruijssen for noticing that I was not fully assuming $ale b$ (saving 5 bytes)



                                                    Takes input as (a)(b) with $ale b$. Returns $0$ (valid), $1$ (ended) or $2$ (invalid).





                                                    a=>b=>a<0|a>29|b>30|b>21&b-a>2?2:b>20&b-a>1|b>29


                                                    Try it online!






                                                    share|improve this answer











                                                    $endgroup$
















                                                      3












                                                      3








                                                      3





                                                      $begingroup$

                                                      JavaScript (ES6),  55 53  48 bytes



                                                      Thanks to @KevinCruijssen for noticing that I was not fully assuming $ale b$ (saving 5 bytes)



                                                      Takes input as (a)(b) with $ale b$. Returns $0$ (valid), $1$ (ended) or $2$ (invalid).





                                                      a=>b=>a<0|a>29|b>30|b>21&b-a>2?2:b>20&b-a>1|b>29


                                                      Try it online!






                                                      share|improve this answer











                                                      $endgroup$



                                                      JavaScript (ES6),  55 53  48 bytes



                                                      Thanks to @KevinCruijssen for noticing that I was not fully assuming $ale b$ (saving 5 bytes)



                                                      Takes input as (a)(b) with $ale b$. Returns $0$ (valid), $1$ (ended) or $2$ (invalid).





                                                      a=>b=>a<0|a>29|b>30|b>21&b-a>2?2:b>20&b-a>1|b>29


                                                      Try it online!







                                                      share|improve this answer














                                                      share|improve this answer



                                                      share|improve this answer








                                                      edited 14 hours ago

























                                                      answered 15 hours ago









                                                      ArnauldArnauld

                                                      79.8k797330




                                                      79.8k797330























                                                          2












                                                          $begingroup$


                                                          VDM-SL, 80 bytes





                                                          f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)} 


                                                          This function takes the scores ordered in ascending order and returns the empty set if the score is invalid or the set containing whether the set is complete (so {true} if the set is complete and valid and {false} if the set is incomplete and valid)



                                                          A full program to run might look like this:



                                                          functions
                                                          f:int*int+>set of bool
                                                          f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)}


                                                          Explanation:



                                                          if(j-i>2 and j>21)             /*if scores are too far apart*/
                                                          or(i<0 or i=30 or j>30) /*or scores not in a valid range*/
                                                          then {} /*return the empty set*/
                                                          else{ } /*else return the set containing...*/
                                                          (j>20 and j-i>1 or j=30) /*if the set is complete*/





                                                          share|improve this answer









                                                          $endgroup$


















                                                            2












                                                            $begingroup$


                                                            VDM-SL, 80 bytes





                                                            f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)} 


                                                            This function takes the scores ordered in ascending order and returns the empty set if the score is invalid or the set containing whether the set is complete (so {true} if the set is complete and valid and {false} if the set is incomplete and valid)



                                                            A full program to run might look like this:



                                                            functions
                                                            f:int*int+>set of bool
                                                            f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)}


                                                            Explanation:



                                                            if(j-i>2 and j>21)             /*if scores are too far apart*/
                                                            or(i<0 or i=30 or j>30) /*or scores not in a valid range*/
                                                            then {} /*return the empty set*/
                                                            else{ } /*else return the set containing...*/
                                                            (j>20 and j-i>1 or j=30) /*if the set is complete*/





                                                            share|improve this answer









                                                            $endgroup$
















                                                              2












                                                              2








                                                              2





                                                              $begingroup$


                                                              VDM-SL, 80 bytes





                                                              f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)} 


                                                              This function takes the scores ordered in ascending order and returns the empty set if the score is invalid or the set containing whether the set is complete (so {true} if the set is complete and valid and {false} if the set is incomplete and valid)



                                                              A full program to run might look like this:



                                                              functions
                                                              f:int*int+>set of bool
                                                              f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)}


                                                              Explanation:



                                                              if(j-i>2 and j>21)             /*if scores are too far apart*/
                                                              or(i<0 or i=30 or j>30) /*or scores not in a valid range*/
                                                              then {} /*return the empty set*/
                                                              else{ } /*else return the set containing...*/
                                                              (j>20 and j-i>1 or j=30) /*if the set is complete*/





                                                              share|improve this answer









                                                              $endgroup$




                                                              VDM-SL, 80 bytes





                                                              f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)} 


                                                              This function takes the scores ordered in ascending order and returns the empty set if the score is invalid or the set containing whether the set is complete (so {true} if the set is complete and valid and {false} if the set is incomplete and valid)



                                                              A full program to run might look like this:



                                                              functions
                                                              f:int*int+>set of bool
                                                              f(i,j)==if(j-i>2and j>21)or(i<0or i=30or j>30)then{}else{(j>20and j-i>1or j=30)}


                                                              Explanation:



                                                              if(j-i>2 and j>21)             /*if scores are too far apart*/
                                                              or(i<0 or i=30 or j>30) /*or scores not in a valid range*/
                                                              then {} /*return the empty set*/
                                                              else{ } /*else return the set containing...*/
                                                              (j>20 and j-i>1 or j=30) /*if the set is complete*/






                                                              share|improve this answer












                                                              share|improve this answer



                                                              share|improve this answer










                                                              answered 14 hours ago









                                                              Expired DataExpired Data

                                                              3186




                                                              3186























                                                                  2












                                                                  $begingroup$


                                                                  Java (JDK), 59 48 bytes





                                                                  a->b->b<0|b>29|a>b+2&a>21|a>30?0:a<21|a<30&a<b+2


                                                                  Try it online!



                                                                  Returns an Object, which is the Integer 0 for invalid games and the Booleans true and false for valid ongoing games and for valid finished games respectively. Takes the score ordered (and curried), with the higher score first.



                                                                  -2 bytes by inverting the end-of-match check.
                                                                  -11 bytes by currying, using bitwise operators, and some return type autoboxing trickery - thanks to @KevinCruijssen



                                                                  Ungolfed



                                                                  a->                      // Curried: Target type IntFunction<IntFunction<Object>>
                                                                  b-> // Target type IntFunction<Object>
                                                                  // Invalid if:
                                                                  b<0 // Any score is negative
                                                                  | b > 29 // Both scores above 29
                                                                  | a > b + 2 // Lead too big
                                                                  & a > 21 // and leader has at least 21 points
                                                                  | a > 30 // Anyone has 31 points
                                                                  ? 0 // If invalid, return 0 (autoboxed to Integer)
                                                                  // If valid, return whether the game is ongoing (autoboxed to Boolean)
                                                                  // Ongoing if:
                                                                  : a < 21 // Nobody has 21 points
                                                                  | a < 30 // Leader has fewer than 30 points
                                                                  & a < b + 2 // and lead is small





                                                                  share|improve this answer











                                                                  $endgroup$


















                                                                    2












                                                                    $begingroup$


                                                                    Java (JDK), 59 48 bytes





                                                                    a->b->b<0|b>29|a>b+2&a>21|a>30?0:a<21|a<30&a<b+2


                                                                    Try it online!



                                                                    Returns an Object, which is the Integer 0 for invalid games and the Booleans true and false for valid ongoing games and for valid finished games respectively. Takes the score ordered (and curried), with the higher score first.



                                                                    -2 bytes by inverting the end-of-match check.
                                                                    -11 bytes by currying, using bitwise operators, and some return type autoboxing trickery - thanks to @KevinCruijssen



                                                                    Ungolfed



                                                                    a->                      // Curried: Target type IntFunction<IntFunction<Object>>
                                                                    b-> // Target type IntFunction<Object>
                                                                    // Invalid if:
                                                                    b<0 // Any score is negative
                                                                    | b > 29 // Both scores above 29
                                                                    | a > b + 2 // Lead too big
                                                                    & a > 21 // and leader has at least 21 points
                                                                    | a > 30 // Anyone has 31 points
                                                                    ? 0 // If invalid, return 0 (autoboxed to Integer)
                                                                    // If valid, return whether the game is ongoing (autoboxed to Boolean)
                                                                    // Ongoing if:
                                                                    : a < 21 // Nobody has 21 points
                                                                    | a < 30 // Leader has fewer than 30 points
                                                                    & a < b + 2 // and lead is small





                                                                    share|improve this answer











                                                                    $endgroup$
















                                                                      2












                                                                      2








                                                                      2





                                                                      $begingroup$


                                                                      Java (JDK), 59 48 bytes





                                                                      a->b->b<0|b>29|a>b+2&a>21|a>30?0:a<21|a<30&a<b+2


                                                                      Try it online!



                                                                      Returns an Object, which is the Integer 0 for invalid games and the Booleans true and false for valid ongoing games and for valid finished games respectively. Takes the score ordered (and curried), with the higher score first.



                                                                      -2 bytes by inverting the end-of-match check.
                                                                      -11 bytes by currying, using bitwise operators, and some return type autoboxing trickery - thanks to @KevinCruijssen



                                                                      Ungolfed



                                                                      a->                      // Curried: Target type IntFunction<IntFunction<Object>>
                                                                      b-> // Target type IntFunction<Object>
                                                                      // Invalid if:
                                                                      b<0 // Any score is negative
                                                                      | b > 29 // Both scores above 29
                                                                      | a > b + 2 // Lead too big
                                                                      & a > 21 // and leader has at least 21 points
                                                                      | a > 30 // Anyone has 31 points
                                                                      ? 0 // If invalid, return 0 (autoboxed to Integer)
                                                                      // If valid, return whether the game is ongoing (autoboxed to Boolean)
                                                                      // Ongoing if:
                                                                      : a < 21 // Nobody has 21 points
                                                                      | a < 30 // Leader has fewer than 30 points
                                                                      & a < b + 2 // and lead is small





                                                                      share|improve this answer











                                                                      $endgroup$




                                                                      Java (JDK), 59 48 bytes





                                                                      a->b->b<0|b>29|a>b+2&a>21|a>30?0:a<21|a<30&a<b+2


                                                                      Try it online!



                                                                      Returns an Object, which is the Integer 0 for invalid games and the Booleans true and false for valid ongoing games and for valid finished games respectively. Takes the score ordered (and curried), with the higher score first.



                                                                      -2 bytes by inverting the end-of-match check.
                                                                      -11 bytes by currying, using bitwise operators, and some return type autoboxing trickery - thanks to @KevinCruijssen



                                                                      Ungolfed



                                                                      a->                      // Curried: Target type IntFunction<IntFunction<Object>>
                                                                      b-> // Target type IntFunction<Object>
                                                                      // Invalid if:
                                                                      b<0 // Any score is negative
                                                                      | b > 29 // Both scores above 29
                                                                      | a > b + 2 // Lead too big
                                                                      & a > 21 // and leader has at least 21 points
                                                                      | a > 30 // Anyone has 31 points
                                                                      ? 0 // If invalid, return 0 (autoboxed to Integer)
                                                                      // If valid, return whether the game is ongoing (autoboxed to Boolean)
                                                                      // Ongoing if:
                                                                      : a < 21 // Nobody has 21 points
                                                                      | a < 30 // Leader has fewer than 30 points
                                                                      & a < b + 2 // and lead is small






                                                                      share|improve this answer














                                                                      share|improve this answer



                                                                      share|improve this answer








                                                                      edited 9 hours ago

























                                                                      answered 11 hours ago









                                                                      Sara JSara J

                                                                      37519




                                                                      37519























                                                                          2












                                                                          $begingroup$


                                                                          Python 2, 47 bytes





                                                                          lambda a,b:[61>60-a>b<3+max(19,a)for b in-~b,b]


                                                                          Try it online!



                                                                          Outputs a list of two Booleans. Thanks to TFeld for writing a test suite in their answer that made it easy to check my solution.



                                                                          ended: [False, True]
                                                                          going: [True, True]
                                                                          invalid: [False, False]


                                                                          The key insight is that a valid score ends the game exactly if increasing the higher value b makes the score invalid. So, we just code up the validity condition, and check it for (a,b+1) in addition to (a,b) to see if the game has ended.



                                                                          Validity is checked via three conditions that are chained together:





                                                                          • b<3+max(19,a): Checks that the higher score b isn't past winning, with either b<=21 or b<=a+2 (win by two)


                                                                          • 60-a>b: Equivalent to a+b<=59, ensuring the score isn't above (29,30)


                                                                          • 61>60-a: Equivalent to a>=0, ensures the lower score is non-negative





                                                                          Python 2, 43 bytes





                                                                          lambda a,b:a>>99|cmp(2+max(19,a)%30-a/29,b)


                                                                          Try it online!



                                                                          Outputs:



                                                                          ended: 0
                                                                          going: -1
                                                                          invalid: 1


                                                                          Assumes that the inputs are not below $-2^{99}$.






                                                                          share|improve this answer











                                                                          $endgroup$


















                                                                            2












                                                                            $begingroup$


                                                                            Python 2, 47 bytes





                                                                            lambda a,b:[61>60-a>b<3+max(19,a)for b in-~b,b]


                                                                            Try it online!



                                                                            Outputs a list of two Booleans. Thanks to TFeld for writing a test suite in their answer that made it easy to check my solution.



                                                                            ended: [False, True]
                                                                            going: [True, True]
                                                                            invalid: [False, False]


                                                                            The key insight is that a valid score ends the game exactly if increasing the higher value b makes the score invalid. So, we just code up the validity condition, and check it for (a,b+1) in addition to (a,b) to see if the game has ended.



                                                                            Validity is checked via three conditions that are chained together:





                                                                            • b<3+max(19,a): Checks that the higher score b isn't past winning, with either b<=21 or b<=a+2 (win by two)


                                                                            • 60-a>b: Equivalent to a+b<=59, ensuring the score isn't above (29,30)


                                                                            • 61>60-a: Equivalent to a>=0, ensures the lower score is non-negative





                                                                            Python 2, 43 bytes





                                                                            lambda a,b:a>>99|cmp(2+max(19,a)%30-a/29,b)


                                                                            Try it online!



                                                                            Outputs:



                                                                            ended: 0
                                                                            going: -1
                                                                            invalid: 1


                                                                            Assumes that the inputs are not below $-2^{99}$.






                                                                            share|improve this answer











                                                                            $endgroup$
















                                                                              2












                                                                              2








                                                                              2





                                                                              $begingroup$


                                                                              Python 2, 47 bytes





                                                                              lambda a,b:[61>60-a>b<3+max(19,a)for b in-~b,b]


                                                                              Try it online!



                                                                              Outputs a list of two Booleans. Thanks to TFeld for writing a test suite in their answer that made it easy to check my solution.



                                                                              ended: [False, True]
                                                                              going: [True, True]
                                                                              invalid: [False, False]


                                                                              The key insight is that a valid score ends the game exactly if increasing the higher value b makes the score invalid. So, we just code up the validity condition, and check it for (a,b+1) in addition to (a,b) to see if the game has ended.



                                                                              Validity is checked via three conditions that are chained together:





                                                                              • b<3+max(19,a): Checks that the higher score b isn't past winning, with either b<=21 or b<=a+2 (win by two)


                                                                              • 60-a>b: Equivalent to a+b<=59, ensuring the score isn't above (29,30)


                                                                              • 61>60-a: Equivalent to a>=0, ensures the lower score is non-negative





                                                                              Python 2, 43 bytes





                                                                              lambda a,b:a>>99|cmp(2+max(19,a)%30-a/29,b)


                                                                              Try it online!



                                                                              Outputs:



                                                                              ended: 0
                                                                              going: -1
                                                                              invalid: 1


                                                                              Assumes that the inputs are not below $-2^{99}$.






                                                                              share|improve this answer











                                                                              $endgroup$




                                                                              Python 2, 47 bytes





                                                                              lambda a,b:[61>60-a>b<3+max(19,a)for b in-~b,b]


                                                                              Try it online!



                                                                              Outputs a list of two Booleans. Thanks to TFeld for writing a test suite in their answer that made it easy to check my solution.



                                                                              ended: [False, True]
                                                                              going: [True, True]
                                                                              invalid: [False, False]


                                                                              The key insight is that a valid score ends the game exactly if increasing the higher value b makes the score invalid. So, we just code up the validity condition, and check it for (a,b+1) in addition to (a,b) to see if the game has ended.



                                                                              Validity is checked via three conditions that are chained together:





                                                                              • b<3+max(19,a): Checks that the higher score b isn't past winning, with either b<=21 or b<=a+2 (win by two)


                                                                              • 60-a>b: Equivalent to a+b<=59, ensuring the score isn't above (29,30)


                                                                              • 61>60-a: Equivalent to a>=0, ensures the lower score is non-negative





                                                                              Python 2, 43 bytes





                                                                              lambda a,b:a>>99|cmp(2+max(19,a)%30-a/29,b)


                                                                              Try it online!



                                                                              Outputs:



                                                                              ended: 0
                                                                              going: -1
                                                                              invalid: 1


                                                                              Assumes that the inputs are not below $-2^{99}$.







                                                                              share|improve this answer














                                                                              share|improve this answer



                                                                              share|improve this answer








                                                                              edited 5 hours ago

























                                                                              answered 7 hours ago









                                                                              xnorxnor

                                                                              93k18190447




                                                                              93k18190447























                                                                                  1












                                                                                  $begingroup$


                                                                                  Retina 0.8.2, 92 bytes



                                                                                  d+
                                                                                  $*
                                                                                  ^(1{0,19},1{21}|(1{20,28}),112|1{29},1{30})$|^(1*,1{0,20}|(1{0,28}),1?4)$|.+
                                                                                  $#1$#3


                                                                                  Try it online! Link includes test cases. Takes input in ascending order. Explanation: The first stage simply converts from decimal to unary so that the scores can be properly compared. The second stage contains six alternate patterns, grouped into three groups so that three distinct values can be output, which are 10 for win, 01 for ongoing and 00 for illegal. The patterns are:




                                                                                  • Against 0-19, a score of 21 is a win

                                                                                  • Against 20-28, a score of +2 is a win

                                                                                  • Against 29, a score of 30 is a win

                                                                                  • Against any (lower) score, a score of 0-20 is ongoing

                                                                                  • Against a score of up to 28, a score of +1 is ongoing

                                                                                  • Anything else (including negative scores) is illegal






                                                                                  share|improve this answer









                                                                                  $endgroup$


















                                                                                    1












                                                                                    $begingroup$


                                                                                    Retina 0.8.2, 92 bytes



                                                                                    d+
                                                                                    $*
                                                                                    ^(1{0,19},1{21}|(1{20,28}),112|1{29},1{30})$|^(1*,1{0,20}|(1{0,28}),1?4)$|.+
                                                                                    $#1$#3


                                                                                    Try it online! Link includes test cases. Takes input in ascending order. Explanation: The first stage simply converts from decimal to unary so that the scores can be properly compared. The second stage contains six alternate patterns, grouped into three groups so that three distinct values can be output, which are 10 for win, 01 for ongoing and 00 for illegal. The patterns are:




                                                                                    • Against 0-19, a score of 21 is a win

                                                                                    • Against 20-28, a score of +2 is a win

                                                                                    • Against 29, a score of 30 is a win

                                                                                    • Against any (lower) score, a score of 0-20 is ongoing

                                                                                    • Against a score of up to 28, a score of +1 is ongoing

                                                                                    • Anything else (including negative scores) is illegal






                                                                                    share|improve this answer









                                                                                    $endgroup$
















                                                                                      1












                                                                                      1








                                                                                      1





                                                                                      $begingroup$


                                                                                      Retina 0.8.2, 92 bytes



                                                                                      d+
                                                                                      $*
                                                                                      ^(1{0,19},1{21}|(1{20,28}),112|1{29},1{30})$|^(1*,1{0,20}|(1{0,28}),1?4)$|.+
                                                                                      $#1$#3


                                                                                      Try it online! Link includes test cases. Takes input in ascending order. Explanation: The first stage simply converts from decimal to unary so that the scores can be properly compared. The second stage contains six alternate patterns, grouped into three groups so that three distinct values can be output, which are 10 for win, 01 for ongoing and 00 for illegal. The patterns are:




                                                                                      • Against 0-19, a score of 21 is a win

                                                                                      • Against 20-28, a score of +2 is a win

                                                                                      • Against 29, a score of 30 is a win

                                                                                      • Against any (lower) score, a score of 0-20 is ongoing

                                                                                      • Against a score of up to 28, a score of +1 is ongoing

                                                                                      • Anything else (including negative scores) is illegal






                                                                                      share|improve this answer









                                                                                      $endgroup$




                                                                                      Retina 0.8.2, 92 bytes



                                                                                      d+
                                                                                      $*
                                                                                      ^(1{0,19},1{21}|(1{20,28}),112|1{29},1{30})$|^(1*,1{0,20}|(1{0,28}),1?4)$|.+
                                                                                      $#1$#3


                                                                                      Try it online! Link includes test cases. Takes input in ascending order. Explanation: The first stage simply converts from decimal to unary so that the scores can be properly compared. The second stage contains six alternate patterns, grouped into three groups so that three distinct values can be output, which are 10 for win, 01 for ongoing and 00 for illegal. The patterns are:




                                                                                      • Against 0-19, a score of 21 is a win

                                                                                      • Against 20-28, a score of +2 is a win

                                                                                      • Against 29, a score of 30 is a win

                                                                                      • Against any (lower) score, a score of 0-20 is ongoing

                                                                                      • Against a score of up to 28, a score of +1 is ongoing

                                                                                      • Anything else (including negative scores) is illegal







                                                                                      share|improve this answer












                                                                                      share|improve this answer



                                                                                      share|improve this answer










                                                                                      answered 11 hours ago









                                                                                      NeilNeil

                                                                                      82.1k745178




                                                                                      82.1k745178






























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