chance
chance = ch;
if (abs(chance - ch) + 25 * n > rnum(150))
return (n ? (n < 0) : (ch < chance));
static int chance; /* chance of being hit */
chance();
void chance(void);
int chance, next, roomcnt;
chance = random() % 10;
if (roomcnt == 3 && chance < 2) {
} else if (roomcnt == 4 && chance < 6) {