Okay. This is a really critical move.
The obvious line involves trading knight for bishop, and I've got to decide if I like the resulting position.
First, what viable alternatives do I have to making the trade? I can't really see any. I could delay it for a bit, maybe Rdg1? That gets crazy complicated. The line I'm looking at as I type is:
Rdg1 Nd5/Rxg4 Rxf2/Nxd4 and I don't know what the what is going on. I've got so many pieces in danger, especially from his bishop, but it kind of looks like I'm better as long as I'm not tactically lost.
If he doesn't play Nd5, what else could he play?
Rdg1 Kg7 looks kind of similar to if I just play Bxg6 right away. Rdg1 Kg7/Bxg6+ Rxf6/Rxg4 and we're back to the same complications that are coming later in this analysis.
Rdg1 could also be met by Rac1 or Rad1, with him making a similarly calm move before we enter the forcing lines.
Umm, okay. I'm getting sucked way down the rabbit hole here. This is going to be one of those positions where I'm in way over my head and if it works out in my favor it looks like I'm brilliant but it was just luck.
Let's check the most forcing line before I get myself too confused.
Bxg6 Rxg6/Rxg4
I'm threatening the d4 pawn, but I'm not even sure I want it. Activating his bishop would be brutal in this endgame. I was thinking earlier that Rxg4 Rxf2/Rxg6+ Kf7/Rdg1 worked for me because I could win his corner rook if he took my knight, but his king gets away via f6-e5-d6.
Ummm, that means I'd have to play Bxf6 Rxf6/Rxg4 Rxf2/Nxd4 if I want to go that route. I really hate that line because after he protects his pawns, I'm not going to be able to stop his bishop from controlling g1 and that's going to make the rook battle impossible.
I could be more patient, I guess. Bxf6 Rxf6/Rg2 looks promising. I can try to get my knight to g3 and then the super dominating e4 spot.
Bxf6 Rxf7/Rg2 Raf8 and I guess maybe I have to sac another pawn in this line.
Bxf6 Rxf7/Rg2 Raf8/Ng3 Rxf2/Rxf2 Rxf2/Ne4 doesn't look good to me. He can play Rf5 and hold everything together and I'll have to fight to get both my pawns back, or I wonder if he can just ignore that, let me take the bishop, and roll down with g3-g2-g1-touchdown!. Testing that out (I won't type out the line), he ends up a tempo short and I just keep it all together. So I guess I just have to worry about Ne4 Rf5, but I still don't know if I like that.
This looked a lot better to me before I started analyzing lines.
What about Bxf6 Rxf6/Rxg4 Rxf2/Ng3 immediately? That looks a lot better. He doesn't have time to get his a8 rook into the game easily because I'm threatening a lot of things at once. His next move is critical. He has to worry about Rxg6 and how he intends to respond to Ne4.
Rf6 to protect g6 just loses immediately to Ne4. If he wants to protect that pawn, it has to be a king move, which gives me time to play Ne4 and force Rf5, which then gives me time to play Rg1 and I'm sitting awfully pretty. I think I'm finally on to something here.
So if he doesn't want to play a king move, his other options would be to counterattack or ignore the threat of Rxg6.
His best "ignore it and develop" move would be Raf8. That's met with Ne4/Rf5 and white just looks so much better.
He could counterattack. With what? If I were him, I'd be looking hard at Rg2, threatening Bc6.
Rg2/Rxg6+ Kf7/Rg5 Bc6/Ne4 Rxg5/Nxg5+ and I think I'm not only going out good but winning a pawn as well.
I've been at this for about an hour now, and I'm so far down the rabbit hole I can barely remember what the original position looks like. I hope this all made sense, and I pity any poor soul who has tried to follow my mental ramblings to this point. Everything seems to point to the Bxf6 Rxf6/Rxg4 Rxf2/Ng3 variation. There's something not good about trying to figure all this out through pure brute force variation-checking, but it's all I got