Black resigned.

Swapping the main defender of Black's kingside.

Now that Black's dark-squared bishop is gone, this knight cannot be exchanged.

This quiet move connects the rooks with decisive effect.

Black resigned in view of 5.Ke2 Qxc3 6.Qxc3 dxc3 7.Rah1 and the mate is inevitable.

Eliminating the main defender of Black's kingside.

Underestimating White's attack.

Correct was 2...Be5 3.Qf2 Rf8! 4.Qh4 Rf7 with chances for a defence.

5...Kxh7 6.Qf7 with the inevitable 7 Rh1+ next.

White soon won the game.