Savestate Request - Bowser Fight (EXTBG?)

I'm curious to understand EXTBG a little better. I don't have any of these games that utilize it though:

* Contra 3
* Super Ghouls 'n Ghosts
* Super Turrican 2
* Tiny Toon's Adventures

But, I've heard SMW's Bowser fight may use EXTBG: https://helmet.kafuka.org/bboard/thread.php?pid=2530#2530

I've never beaten SMW before, but I have a cart. Does anyone have a savestate of this fight (preferably in Mesen) by any chance? $2133.4 is displayed way at the bottom of the register viewer; that's how I was able to verify that Super Mario Kart's "Ghost Valley" track does not use EXTBG. Or, if there's anyone who can explain what graphical effect is being achieved with EXTBG in the Bowser fight, that's fine too - I've seen it on YouTube.

If you've never heard of EXTBG, here's an excellent explanation of what it was supposed to be: https://forums.nesdev.org/viewtopic.php?p=168183#p168183

BTW, thanks to Ladida for explaining to me that EXTBG is more of a "bonus" - it falls far short of having a second background.

I think the poster there was just remembering wrong/misinformed. SMW never sets the EXTBG bit anywhere, including for the Bowser fight.

Ah, ok thanks. I'm sure ACE is faster, but I found a way to skip ahead to the bowser fight:

https://www.chaptercheats.com/cheat/snes/7074/Super-Mario-World/hint/1730/

Not that I don't believe you - just a tip for anyone who wants to verify. Sounds like getting those other games is the best way to move forward in my EXTBG research.