# [Python 2], <s>97</s> <s>95</s> <s>75</s> <s>72</s> <s>71</s> <s>70</s> 69 bytes <!-- language-all: lang-python --> 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!][TIO-jtqv5ak6] [Python 2]: https://docs.python.org/2/ [TIO-jtqv5ak6]: https://tio.run/##jZbNbuNGEITvfgreLGElgNXzQ85CNrDA7iFAkGMujg8UZDkCHNnwGgH26R2qq8aUmA2QyxhNa@prkl3Fefnx9ufz0d73N3@8Pw1/bXdDM6y2nxdrbIbNzXZj9vzatJvhdrsOm@0m4Hb4hOVw3C2s3WzXi/FSu7wdlp8Ww@Z0Zfn@8no4vjXXfw9Ph13zcNw97D5fX/HiftG0q8aw/Khhl7VhrMNZ3a@aETDVhfXVBeVwbF6ehh8zTnO2z7ntJRc24877sIlzODrpjLA@/QRl2rJGudRo1qdfzO7VZvdy9v/QXt5rHH8fz54FWke2JwYvXv3@5ddfvt7c3bWr9n41rvDVfA2@Rl@Tr9nXztfe18Jd2szd4HZwPygAKoASoAYoAqoYVeykghVX8zX4Gn1NvmZfO197Xwt3tfwjDW4H94MCoAIoAWqAIqCKUcU7Me/BvAfzHsx7MO/BvAfzHsx7MPZg7MHYg7EHYw/GHow9GHsw9mDswdiDsYfg9OD04PTg9OD04PTg9EB6ID2QHkgPpAfSA@mB9EB6ID2QHkiPzo3Ojc6Nzo3Ojc6N5EZyI7mR3EhuJDeSG8mN5EZyI7mR3OTE5MTkxOTE5MREYiIxkZhITCQmEhOJicREYiIxkZhIzM7KzsrOys7KZGWyMlmZrExWJiuTlcnKZGWyMlmZrM4pnVM6p3SkdKR0pHSkdKR0pHSkdKR0pHSkdKR0pPSu37t@T/2e@j31e@r31O@p31O/p35P/Z76PfV76hdXLlQuVC5ULlQuVC5ULlQuVC5ULlQuVC5KAMUKlCtQsEDJAkULlC1QuEDpAsULlC9QwKAmTE2JGhM1J2pQ1KSoUVGzooZFTYsaF8oLyPKQ5yHTQ66HbA/5HjI@5HzI@pD3IfdC9oX8CxkYcjBkYcjDkIkhF0M2hHwIGRFyImRFyIuQGSE3Qm6C7AT5CTIU5CjIUpCnIEtAnoBMAbkCsgXkC2iqobGG5hoabGiyobGE5hIaTGgyoamCxgqaK9McWDvVHtE17zHVntmm2qbaQzyoDlPtqR5Vx6n2mE@q01R77mfVear9Q9Cp7qbavwy96v6jDn4/RXU51fdXV99@@/qNn3Z9UevnDOfRrqRV/CmZFB1yeLVjtU0d8zqedbzqmNTXXl9nfV31tfzrsc8f6/yxzR/L7LZ5u@fnuY9T1veHt8V@MZ5Hl/vxFDr@PZ30/MxTT0XXlwfMn27wJ/mx4fH5cHz8H4TmsG/uxgv3zfH57Uzmv06EM6XTjtfh@PiwWKfx/NUum9Pl7XR58ItzCG/u/R8 "Python 2 – Try It Online" Takes input as pre-ordered `a,b`. Returns `1`, `0`, `False` for `ended`, `in play`, `invalid`. <sub>-1 byte, thanks to Kevin Cruijssen</sub>