Black is lining up for a kingside attack, while . . . Nd6-c4 is also a strong positional threat. White next is a blunder, missing Black's main threat.

Without queens the attack remains as strong. White has no defenders and is dead lost.

Black has a spatial advantage, but White finds the best way to activate her queen.

Asking for trouble. 24 . . Kh8 25.Nb6 Qd6 is equal. This was a blitz game . . .

Now Black loses material.

With a king's attack in the making, you would hardly be inclined to exchange queens. Nevertheless, having eliminated the alternatives Giri came to the conclusion this was the best way to continue the attack. He wrote: 'I was very, very happy with this move, which only occurred to me after a pretty long think.'

Here the straightforward 20.Bxe7 Nxe7 21.g4 would have left Black not a single chance, though, after the text move, Giri won the game anyway.

Protecting e2, while the rook can switch to d2 as well. This may not be your first idea due to the vis-a-vis with the e6-bishop.