Sorry to repeat an earlier Ncd7

I also think this was the best recapture. EDIT actually in light of 22.Nh4! I think the queen recapture was more correct.

I think Nh4!? Was whites best move. With the idea of getting the knight to the powerful f5 square. Check it out, 22.Nh4 Bxg2 23.Nf5 Qc7 (for example) Kxg2 and white seems alright. If 22...Nc7? 23.Qc6! Leaves white with a very good position, check out the variations for yourself. And blacks last try is Bc2?? 23.Rc1! 22...Bg6 also looses. Actually I think 22.Nh4!? Is pretty good and practically forces ...Bxg2 23. Nf5! (An important in-between move) with Kxg2 to follow looks as though white has an edge. .

@jkarp, a and c files are already open. Black has full control of a file and perhaps using his central minor pieces may want to control further squares around the pawn

Played one move too late with the black queen no longer on e7 this move lacks the sting it otherwise would have had.

26....Qa1+ 27.Rd1? Qxsb2 would win a pawn for black, so 27.Kg2 was better.

I think Qg4!? Was worth a shot.

If the h4 knight moves, black straight away plays Nf3+, winning the exchange. So this move for white allows him to move his knight (probably to f5). So it absolutely matters.