What attempts by the Foundation to destroy 498 has it withstood, hence the Durability? In any case, I think this COULD have a conclusive victor.
Victory Conditions: Killing the opponent, removing the opponent from the battlefield for at least one week (
BFR), knocking the opponent out for at least one hour, or incapacitating the opponent by putting him in a state in which he can not harm the other fighter(s) for over a day, are to be assumed as victory conditions.
498 "attacks" through sound waves, which require air as a medium to travel through. Or, making assumptions about 498's supernatural nature, it would have to create sound waves... which are vibrating air.
A Black Hole would absorb any & all matter, air -vibrating or not- included? So wouldn't the black hole absorb 498's sound, preventing it from actually damaging anything?
Of course, said black hole would be either its own or 891's, which would probably trap the cake(s) indefinitely. Is self-incapacitation a lose condition?
However, supposing the cakes duplicate independent of the black hole, they could be argued as less incapacitated. The clock's parts, however, could still release sound... they'd just still be in the black hole & still get absorbed.
(Also, cake mass might EVENTUALLY press the Snooze button down.)
Does that seem like sound reasoning for 871 to win?