neuroevolved-chess-engine/helpers.py at main · gzemo/neuroevolved-chess-engine · GitHub

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# Credits:
# Disservin: python chess engine (https://github.com/Disservin/python-chess-engine/tree/master)

MAX_PLY = 5 # default 60

CHECK_RATE = 256

VALUE_INFINITE = 32001
VALUE_NONE = 32002
VALUE_MATE = 32000
VALUE_MATE_IN_PLY = VALUE_MATE - MAX_PLY
VALUE_MATED_IN_PLY = -VALUE_MATE_IN_PLY

VALUE_TB_WIN = VALUE_MATE_IN_PLY
VALUE_TB_LOSS = -VALUE_TB_WIN
VALUE_TB_WIN_IN_MAX_PLY = VALUE_TB_WIN - MAX_PLY
VALUE_TB_LOSS_IN_MAX_PLY = -VALUE_TB_WIN_IN_MAX_PLY


def lsb(x: int) -> int:
    return (x & -x).bit_length() - 1


def poplsb(x: int) -> int:
    x &= x - 1
    return x


def mate_in(ply: int) -> int:
    return VALUE_MATE - ply


def mated_in(ply: int) -> int:
    return ply - VALUE_MATE