see_rec            32 src/see.cpp    static int  see_rec       (alists_t * alists, const board_t * board, int colour, int to, int piece_value);
see_rec           145 src/see.cpp       value -= see_rec(alists,board,def,to,piece_value);
see_rec           194 src/see.cpp       return see_rec(alists,board,att,to,piece_value);
see_rec           237 src/see.cpp       value -= see_rec(alists,board,COLOUR_OPP(colour),to,piece_value);