it turns out that the opposition of the queens is in White’s favour.
It was essential to increase the pressure with 21...Bc5!. White would have to fight for equality: 22.b4! (he cannot solve his problems with 22.Rd2 Rd8 23.Qb3 (23.Rad1 Nxb2 24.Nc6+ Kc7 25.Rxd8 Bxe3–+) 23...Rxd4 24.Rxd4 Bxd4 25.Qxa4 Bxf2+ 26.Kh1 Qxb2 Black has the advantage, since the e5-pawn is also an object of attack) 22...Bxb4 23.Qb3 Bc3 24.Rac1 Bxd4 25.Qxa4 Bxf2+ 26.Kh1 Be3 27.Rc3 Rc8. The e5-pawn is weak, and Black’s chances are preferable.

There is no defence against the Rf1 being brought in, so Black resigned.

The Bd5 is X-rayed by the Bg2, but defended by the Ne7. With the help of a piece currently standing on the edge of the board, White gets through to the target:

It should be noted that, in such positions, a knight on h4 has no other prospects than a possible jump to g6.

The light squares in Black’s camp are creaking, and so he is defenceless.

Black resigned.

Black has incautiously placed his queen on c7, which White exploits:

White has not only an extra pawn, but an active rook, which is no less important.

Now, the advance ...a6-a5 is impossible, and the black rook remains in a passive position.

This attempt to get active is doomed to failure, since he has no targets on the kingside – the f2-pawn is not only defended, but ensures an excellent post on e3 for the bishop.