Bamzuke 

A hard event that no one could probably ever beat

That was a unbeatable bamzuke

Bamzuke by Steven Carpenter May 20, 2008

banzuke 

A japanese word meaning "list" or "ranking". Most known in tournaments, but can even be used to describe a class rank.

Also in the TV show, "Unbeatable Banzuke".

Watashi mo Unbeatable banzuke ga suki desu.

(I also like Unbeatable banzuke.)

banzuke by Eric Babaganoush January 12, 2009