The W-maneuver, the bishop-colored corner, the win.
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K+B+N mate (animated)
Concept
K+B+N mate (animated)
The hardest basic mate. Mate only lives in the bishop-colored corner. Drive the king there with the W-maneuver: knight zig-zag while king and bishop press in.
Remember
• Mate only lives in the corner the bishop's color reaches.
• Drive the king there with the W-maneuver: a knight zig-zag.
• 50-move rule means you can't dawdle. Execute cleanly.
• Every master knows it cold. Many club players don't.