Threatening Nf6+. A fighting draw followed:

1.h7?? A fatal blunder that costs White the game.

Instead, he should have played: 1.Kd2! Rh3 2.h7 with an easy draw.

1...Be8! Heading for g6 to seize the b1-h7 diagonal.

The bishop is installed on a protected square. Black has no problems.

1.c4!
Clearing the long diagonal for the bishop, where there is no black counterpart.

In order to soften up Black's kingside.

Heading for b3 to harass the a5-bishop.

White has a clear advantage.