A fantastic game from Doha- Naiditsch v Ankit

Thanks to @Boltonchessclub, who tweeted me to point out this fantastic game:

Naiditsch, A v Ankit, R, Qatar Masters 26/11/14

I have lightly annotated the game on my blog cloud database. If you wish to have a go at the puzzle, read the rest of this blog before looking at the game file.

The diagram below shows white's king's walk.

Below is a critical position.

Questions

What was black's last move (note, it wasn't a capture);

What did white play?;

What are my engine's two top choices for white?

Solution

Bh4-g3;

Kg3 (the easiest question)

Nf6+!, with the idea of exchanging queens before taking the Bg3; and its first preference:

Nf5! and the tactics after Be5 2 Bc4 g6 3 Re1! Nd7 4 Bf4! apparently favour white.

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