SLIDER_ATTACK     342 src/attack.cpp    return COLOUR_IS(piece,COLOUR_OPP(colour)) && SLIDER_ATTACK(piece,inc);
SLIDER_ATTACK     362 src/move_check.cpp          ASSERT(SLIDER_ATTACK(piece,inc));
SLIDER_ATTACK     315 src/see.cpp          if (SLIDER_ATTACK(piece,inc)) {