# Is it possible to force checkmate with King, knight, and Bishop vs. King?

If a King, Knight, and Bishop are pitted against the opposing King, is it possible to force checkmate? I find it very hard to do, enough so that I'm not sure whether there's a clean method.

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Yes, mate can be forced in 33 moves from nearly any position, according to Wikipedia.

See the standard "w" maneuver cited in that article.

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Here is that longest checkmate: gilith.com/chess/endgames/kbn_k.html – Xonatron Jan 5 '15 at 23:21

Yes it is possible to force mate. There's a phenomenal video explaining the process on chessvideos.tv.

If you want to practice the endgame, you can do so on the same site as well.

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Yes, it can be done. The standard position is to force the enemy king into a corner of the same color as the bishop. Then there are four squares (the corner, the diagonal, and two lateral) squares that need to be attacked.

The bishop attacks the corner and diagonal squares, the king guards one of the lateral squares, and the knight the other one.

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Diagram oh so welcome. This would really make this question and answer incredibly more useful (tell me if you'd rather have me post it). – Nikana Reklawyks Nov 27 '12 at 5:02

Yes it is. Check out this video!

The general rule is to get the opponent king in the same corner as your bishop. Use the knight and king to control the squares of opposite color to the color your bishop controls. Then, drive the opponent king to one of the two corners with the correct color!

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It is not always possible , I try out everything possible in maximum cases I found it written as possible but then I started playing obtaining that position with chess grandmaster , it doesn't let his game defeated by any cost , then I tried grandmaster with various softwares and finally game draw .

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It is actually always possible, except when the defender can take one of the pieces. Can you give an example of a position you think is a draw? – Dag Oskar Madsen Jan 20 '14 at 10:55
What do you mean by a "chess grandmaster"? A software or a human GM? – JiK Jan 20 '14 at 15:48