Let's take stock for a moment: material is even, but
we (Black) have a pawn on the 7th rank, ready to promote.
There's only one problem - White threatens checkmate: 1...f1=Q
2.Rg8 mate.
Analysis Diagram: after 2.Rg8 mate
This is one of the basic checkmate patterns that you
should be familiar with. Note how the knight protects the rook?
It would also prevent ...Kh7 if the square wasn't already occupied.
Nor will capturing the knight stop mate: 1...Rxf6
2.Rb8+ and now it is mate in two.
1...Re8 2.Rxf2 Rxb1 wins, but the actual move played
here is much faster.
1...f1=N+
This under-promotion probably took White by surprise.
Now Black has managed to promote his pawn, achieving a material
superiority, without allowing White time to effect mate.
2.Kh1
2.Kg1 Nd2+ 3.Kh2 (3.Rxe1 Nf3+ 4.Kh1 Rxe1+ 5.Rg1 Rxg1#)
3...Nf3+ 4.Kg3 Rxb1 and Black wins.
2...Ng3+
Double-check.
3.Kh2
Black chooses this moment to simplify by trading off
all of White's remaining pieces, winning the hanging rook in the
process.
3...Rxb1 4.Rxg3 Rb2+ 5.Rg2 Rxg2+ 6.Kxg2 Rxf6
Black's remaining pieces are unopposed, and White can
safely resign now.
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