There is a dedicated thread for this: List of standard maps for Heroes 3, and in this post – an archive of all the standard maps.

Correction: No, I checked, the map “The Ultimate Fight” is NOT one of the standard ones! Moreover, it’s not in any of my collections, nor in the largest online collections. And even after searching on Google, I didn't find either the map itself or even a mention of it anywhere on the Internet! From which we can make two assumptions:
a) This map once existed but somehow disappeared from everywhere (how? :confused:);
b) The map was actually called something else.
Personally, I lean towards option "b". ;) And, by the way, Elsukov: the post you quoted dates back to December 16, 2011! :)