Instructive endgame

An instructive position from one of my games.A rather poorly played game from my side but I managed to save it through better endgame knowledge.

White has 2 moves that force an easy draw.Can you spot the idea?

1. Na3 or Ne3 (any Black move)
2. Nc4 (any Black move)
3. Nxb6

Then the White kings runs to h1 and plays back and forth between this square and g1, g2 or h2. The king can't forced away from the corner as Black's bishop controls the wrong colour (h1 is a white square, the bishop is a black-squared bishop) and so Black's h-pawn can never be forced home.

Originally posted by Fat Lady
1. Na3 or Ne3 (any Black move)
2. Nc4 (any Black move)
3. Nxb6

Then the White kings runs to h1 and plays back and forth between this square and g1, g2 or h2. The king can't forced away from the corner as Black's bishop controls the wrong colour (h1 is a white square, the bishop is a black-squared bishop) and so Black's h-pawn can never be forced home.

Originally posted by Fat Lady
1. Na3 or Ne3 (any Black move)
2. Nc4 (any Black move)
3. Nxb6

Then the White kings runs to h1 and plays back and forth between this square and g1, g2 or h2. The king can't forced away from the corner as Black's bishop controls the wrong colour (h1 is a white square, the bishop is a black-squared bishop) and so Black's h-pawn can never be forced home.