The concluding move of a nice combination. White resigned.

White has full control of the e-file, but Black’s pawn formation is harmonious, and there are no entry squares in his position. At the same time, the Nc4 is cut off from the kingside, and the Bg7 is restricted by both his own pawns and the white chain on c3-d4. Meanwhile, White’s own dark-squared bishop is not a very active piece. This all points to a small sacrifice, which has more of a positional rather than a tactical character.

Black loses time, which allows White to bring the inactive Ra1 into the attack. It was essential to find the problem-like 26...Rh6! 27.Nxf7 Qxf7 28.g4 Rf6 29.Qe8+ Bf8 30.Qxf7+ Kxf7, with a double-edged, roughly equal endgame.

This attempt to hang onto the material meets a refutation.
It was still possible to restore the coordination between his pieces by means of 27...Rdf6, although after 28.Nxf7 Qxf7 29.Qg4+ Kh8 30.f3 White has a lasting initiative, with approximate material equality.

The white pieces cooperate excellently, and even with minimal forces are able to create a decisive attack on the undefended black king.

In view of the unavoidable mate in 2, Black resigned.

The exchange of all the major pieces is not so terrible for Black, because he has an outside passed h-pawn. But all the while, the white king remains safe, and it is uncomfortable for Black to continually watch his weak back rank. Therefore, Black gives up one of his doubled pawns, to break up the white king’s cover.

The knight comes to d5 with tempo – this is the ideal square for the attack.

This move, ensuring the b3-square for his major pieces, decides the outcome of the game.

White resigned.