White resigned, since after 43.Kd3, there follows 43...c4+.

The white e-pawn cannot advance, because the d4-pawn would be hanging. This means that it needs to be blockaded, so as to leave White with a bad bishop. Obviously, to do this, we need the knight. The route to e4 is obvious:

The attack on the rook is extremely useful for Black, as it effectively shortens by one tempo the route to e4.

Definitely the right move, forcing the exchange of bishops. The superiority of the knight over the remaining white bishop will be overwhelming.

This desperate attempt at counterplay does not give any chances – the advance of the pawn is not supported by the white pieces. Black reacts in the simplest possible way, keeping the position closed, which suits him.

The queen alone cannot give mate, but it was hard to recommend anything to White – Black is already prepared to break in down the c-file.

White resigned, without waiting for 39...Rc8.

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The position is quite non-standard, with both kings in the centre. But whilst White can castle by hand, and evacuate his king to the kingside, it is harder for Black to find a safe home for his king. This is the main thing that defines White’s advantage. With his next move, White ensures himself a static advantage.

Black cannot bring his bishop out to a6 and it is impossible to get his pieces out at all. This means that sooner or later, he will have to advance the d-pawn, after which his pawn structure will lose its solidity.

Here, the rook exerts strong pressure on the open file. In open positions, such an approach is usually more effective than building pressure on some weakness or other. So this move is stronger than 20.Rhc1, for example.