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Here is a picture of the starting position. White to move.

[FEN "8/8/8/3nk1pp/8/3K2PP/5P2/8 w - - 0 1"]

1. f3 h4 2. f4+ gxf4 3.gxf4+ Kxf4 4. Ke2 Kg3 5. Kf1 Kxh3 6. Kg1 Kg3

1. f3 h4

2. f4+ gxf4 (to make it into king and knight + rook pawn endgame which is drawn)

3.gxf4+ Kxf4

4. Ke2 (to reach the g1 and h1 squares to draw)

4... Kg3

5. Kf1 Kxh3

6. Kg1 Kg3

I forgot the rest of the moves, but somehow it's losing for white. I thought a king and knight + rook pawn is always drawn if the opponent's king can reach the g1 h1 squares. Why didn't it work this time and when are these endgames drawn?

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    Maybe what you have in mind is the situation where the black pawn has already been pushed to the second rank. If you push the pawn too early too far, it's actually a draw.
    – BlindKungFuMaster
    Feb 7, 2016 at 10:18

1 Answer 1

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14

You're confusing this theoretical endgame with K+B+P vs K.

If the bishop doesn't match the promotion square of a or h file that the pawn is on, then the pawn can not promote in your scenario.

On the other hand, the knight can go to any square on the board potentially so the h1 square can be covered by it.

enter image description here

I suggest going to the link below to understand how to force the king out of the corner. Ideally you should get this position with white to play, and check to force Kg8 and push the pawn.

enter image description here

http://www.chesskit.com/training/endgame/KNPk/1/index.php

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    If you get that position with black on the next square over, that's just as good for white, because h7+ Kh8 Nf7 would be checkmate.
    – Brilliand
    Nov 19, 2017 at 2:38

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