Any means by which White can get his queen to h4 or h5 are good. He finds a way:

27...Qxb8 28.Qxh4 and soon mate.

The final deflection. White resigned. After any capture, he is mated: 29.Qxe3 Qg2# or 29.Rxe3 Qf1+ 30.Bxf1 Rxf1#.

It seems that the knight has fallen on c8, because natural kinds of pressure on the bishop on c5 do not bring significant benefits. For example, 15.Rc1 can be met by 15...Nd7, with an uncertain struggle. However, if you connect your imagination, it is possible to find...

Black’s pieces are scattered and passive, and White’s initiative is very dangerous. Noticing that the black queenside would be indefensible without his queen, one can find...

It is rare that with development incomplete, one can make a decisive sacrifice with an already developed piece. This example confirms the rule – White brings his undeveloped bishop out with decisive effect.

If the bishop is taken, then after 11...Qxg5 12.Qb6 Qxg2 (12...Be7 13.Qxa7 0-0 14.g3) 13.Qxa7, White wins.

On 13...f5, White opens the position by means of 14.g4!.

There is no defence against the threat of advancing the h- and g-pawns.