(1) <24...Rxf1+> 25.Qxf1 Qh4#

(2) <24...Qh4+> 25.Kg1 Re2+ 26.Qf2 Bxf2#

You go for the one you see that you're sure is checkmate.

If you see mate-in-three, is there really a reason to try to find a mate in two?

The basic "mate-in-three" idea that some of us saw was already in Black's head when he played 20.... Ng4. It had to be, since that attack is what makes Ng4 playable in the first place.

But at some point after that, perhaps while White's clock was running, or perhaps while Black was re-calculating to make sure he had no errors, he noticed the Rook sacrifice.

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The text opens up the bishop's eye on g2 with a check and decoys the queen away.

First thought of 24 ... Rxg2. Threat: 25 ... Rg1#. If 25 Bxg2, then the Bishop obstructs g2, so that after 25 ... Qh4+ White must play Bh3 and Qxh3 is mate, right?

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Rybka 4.1 x64: