#define DARK(DUMMY) ((!CNDBIT(game.loc,LIGHT)) && (game.prop[LAMP] == 0 || !HERE(LAMP)))
#define PCT(N) (randrange(100) < (N))
#define GSTONE(OBJ) ((OBJ) == EMRALD || (OBJ) == RUBY || (OBJ) == AMBER || (OBJ) == SAPPH)
#define DARK(DUMMY) ((!CNDBIT(game.loc,LIGHT)) && (game.prop[LAMP] == 0 || !HERE(LAMP)))
#define PCT(N) (randrange(100) < (N))
#define GSTONE(OBJ) ((OBJ) == EMRALD || (OBJ) == RUBY || (OBJ) == AMBER || (OBJ) == SAPPH)