Better than Checkmate

While I was struggling for an advantage in a must-win game, my opponent became cooperative. He played 26.Kh1?? from the diagram position.

White to move

This error made possible the combination of my fantasies. 26.Nxe4 keeps the struggle alive.

26...Qg5!

I spent some time working out some possibilities:

If 27.g4 Qh4 28.Kg2 Rxg4+! 29.hxg4 Qxg4+

White to move

30...Nd2 will follow either 30.Kg2 or 30.Kg1, and White must lose the queen to avoid checkmate.

If 27.g3 Nxg3+! 28.fxg3 Qxg2 29.Qc2 Qxh3+ 30.Qh2 Rxe3 with plenty to show for the knight.

White to move

My opponent deprived me of the opportunity for playing these strong moves.

27.Rg1 Nxf2+ 28.Kh2 Qg3#

Checkmate, in this case, was a disappointing end to the game.