BIT_LAST          941 src/eval.cpp            rank = BIT_LAST(board->pawn_file[att][file]);
BIT_LAST         1847 src/eval.cpp      dist = BIT_LAST(board->pawn_file[COLOUR_OPP(colour)][file]);
BIT_LAST          508 src/pawn.cpp               rank = BIT_LAST(board->pawn_file[me][file]);