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In chess, one player can have different material combinations, for example:
"1 queen, 2 rooks, 2 knights, 2 bishops, 8 pawns + the king" is one combination
if the player loses one bishop:
"1 queen, 2 rooks, 2 knights, 1 bishop, 8 pawns + the king" is another combination
..afterwards, if a paw...