# [Python 2], <s>97</s> 95 bytes

<!-- language-all: lang-python -->

    def f(a,b):
     if a>b:a,b=b,a
     if-1<a<=b<22or 0<a>=b-2<b<31>a+1:return a<20<b==21or 20<b-(b<30)>a

[Try it online!][TIO-jtpyhm4m]

[Python 2]: https://docs.python.org/2/
[TIO-jtpyhm4m]: https://tio.run/##jZZPi9tIFMTv/hS6jc3aoHrdrT@DPRBIDgvLHvcyzEHG9qwh2IPjDeTTz0qvqke2koW9vMlT1PV7krtK/fbj@vf5ZO/vu/2hOMy75XbxOCuOh6J72j723Wa77IZ@hXW33mzXZudLUa67p812ZevtOuCp@w2Pl/31n8up6NZWrrebjaG/a/jnat7fUi6euve3y/F0LR6@d1@Pu2J/2u13jw8zXjzMi3JZGBYfPey@N/R9uOmbZdHLjn3LfnZHOZ6Kt6/djwmnuFnn3PKeC5twp3PYyDmenHRDWA23oB2XrNDeaxSr4Y7Js9rkWW7@P5T3zxr7@@PNu0DpyHJg8OLsr09//P558/xcLsuXZV/h1bwGr9Fr8lp5rb02Xluu0mKuBpeD60EBUAGUADVAEVDFqGKDCpas5jV4jV6T18pr7bXx2nJVyT/S4HJwPSgAKoASoAYoAqoYVXwS8xnMZzCfwXwG8xnMZzCfwXwG4wzGGYwzGGcwzmCcwTiDcQbjDMYZjDMYZwhOD04PTg9OD04PTg9OD6QH0gPpgfRAeiA9kB5ID6QH0gPpgfTo3Ojc6Nzo3Ojc6NxIbiQ3khvJjeRGciO5kdxIbiQ3khvJTU5MTkxOTE5MTkwkJhITiYnERGIiMZGYSEwkJhITiYnEylmVsypnVc6qyKrIqsiqyKrIqsiqyKrIqsiqyKrIqsiqnVI7pXZKTUpNSk1KTUpNSk1KTUpNSk1KTUpNSk1K4/qN6zfUb6jfUL@hfkP9hvoN9RvqN9RvqN9Qv6F@68otlVsqt1RuqdxSuaVyS@WWyi2VWyq3VG6VAIoVKFegYIGSBYoWKFugcIHSBYoXKF@ggEFOmJwSOSZyTuSgyEmRoyJnRQ6LnBY5LpQXkOUhz0Omh1wP2R7yPWR8yPmQ9SHvQ@6F7Av5FzIw5GDIwpCHIRNDLoZsCPkQMiLkRMiKkBchM0JuhNwE2QnyE2QoyFGQpSBPQZaAPAGZAnIFZAvIF9CuhrY1tK@hjQ3tbGhbQvsS2pjQzoR2FbStoH1l2gdWjr1HdM57jL1ntqm3sfcQD@rD2HuqR/Vx7D3mk/o09p77lfpq7P1DUKuvx96/DI365qMP/jyt@nboX2azL39@/sJPu76o@XOG22hX0ir@lEyKDjk82zHbJm/zvD3z9srbJP/s@efMP1f@WX567dPXOn1t09cyeWw@7u157uOU9W1/nfOoeuiPmf3f4aTnZ558Knq4P2D@coG/yY8Fr@fj6fV/EIaj8XN/4aU4na83Mv91IpwoDSsu3el1P1@l/vxVLorh8vbnyz3m2/ly3e/mTltkHB/z/V8 "Python 2 – Try It Online"

Returns `True`, `False`, `None` for `ended`, `in play`, `invalid`.