White has sacrificed a pawn, and needs to show that he has something for it.

An unexpected square for the queen. The main idea is to cover the square e3, via which the black queen could travel with check, to her king’s defence. Other moves are simply bad:
A) 18.Qh4? h6 19.Rhd1 Ng6 20.Qh5 a5μ;
B) 18.Qh5? gxf6 19.Rh4 Qe3+ 20.Kb1 h6–+.

Sad for Black, but necessary, otherwise he cannot avoid mate on g7.

In addition to his material advantage, White can add the plus of the weakened enemy king.

Black resigned.

This example reminds us of the importance of knowing the opening well, and thoroughly analysing one’s own games. White had prepared for the game, but Black had done so significantly better.

Beginning a direct attack on the king.

There is already no defence! It turned out that Sergei Zhigalko had had this position on his board at home, and, what is even more important, he remembered its assessment!

It was essential to test the opponent in the variation 22.Bxc6 Nxf1 23.Bg2 Rg6 24.f4, although here too, Black wins:
24...Nxe3! (24...Nxh2? 25.Kh1! is already good for White) 25.Rxe3 Qxe3+ 26.Kh1 e4 27.Bc1 Rxg2 28.Qxg2 Qb3 29.Rxd6 Nf8 30.Bb2 g6 31.h4 Qxc4 32.h5 Rc8 33.hxg6 hxg6 34.Rxg6+ Nxg6 35.Qxg6+ Kf8 36.Qxf5+ Ke8–+.

White resigned.