DRY: the roomier-side bias computed its probability two ways (STROLL_TOWARD_ROOM and 1 - STROLL_TOWARD_ROOM). One draw XNOR'd against the roomier side says the same thing more plainly.
DRY: the roomier-side bias computed its probability two ways (STROLL_TOWARD_ROOM and 1 - STROLL_TOWARD_ROOM). One draw XNOR'd against the roomier side says the same thing more plainly.