How To Checkmate With Bishop and Knight EASY (not really)

My knowledge of the Bishop and Knight mate was not complete.  I've pulled it off a couple of times, but not against what I think is the best defense.

About 6.5 minutes into this video, he assumes that the Black king runs back toward the wrong corner.  However, this makes White's job easier.


I always had trouble if the King runs the other way, which is to d8 and c7.  I had a general idea of what to do, but I hadn't practiced it enough to have mastered it, until now.

In the following sequence, moves 15 to 26 are the key idea.  Learn this sequence and the mate becomes easier.

[Event "Blitz:5'+2""]
[Site "?"]
[Date "2021.01.23"]
[Round "?"]
[White "Coffey, John"]
[Black "Stockfish 12"]
[Result "1-0"]
[SetUp "1"]
[FEN "8/8/8/8/4k3/8/8/4KBN1 w - - 0 0"]
[PlyCount "59"]
[EventType "blitz"]

1. Kd2 Kd4 2. Bd3 Kd5 3. Ne2 Kc5 4. Ke3 Kb4 5. Kd4 Kb3 6. Be4 Kb2 7. Kc4 Ka1 8.
Kc3 Ka2 9. Nd4 Ka1 10. Nb3+ Ka2 11. Bf5 Ka3 12. Bb1 Ka4 13. Nd4 Ka5 14. Kc4 Kb6
15. Nb5 Kb7 16. Bf5 Kc6 17. Be6 Kb6 18. Bd7 Ka5 19. Kc5 { Some knight moves mate 1
move faster, but I like the simplicity of moving the king.} Ka4
20. Be6 Ka5 21. Bb3 Ka6 22. Nd6 Ka5 (22... Ka7 23. Bc4 Kb8 24. Kb6 Ka8 25. Kc7
Ka7 26. Nc8+ Ka8 27. Bd5#) 23. Nb7+ Ka6 24. Kc6 Ka7 25. Kc7 Ka6 26. Bc4+ Ka7
27. Nd6 Ka8 28. Bd3 Ka7 29. Nc8+ Ka8 30. Be4# 1-0

There is an alternative method where you use your three pieces to make a diagonal shaped wedge, and you try to force the enemy king into a smaller wedge.  Although supposedly simpler to understand, in practice I find that I can become confused on how to play it.  The cool thing about the above game is that you are almost guaranteed to reach the position after White's move 14, although possibly on a different edge of the board.  From there you just need to know the sequence to finish it.

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