Bishop and Knight Mate: The W-Maneuver Explained
White to play and win
PlayThe defending king is hiding in the wrong corner, the one your bishop cannot touch. To win, you have to walk it along the edge to the right corner. The knight leads the way with the famous W-maneuver.
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Two Minor Pieces: The W-Maneuver
White to play and win · Win against perfect defense
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The theory
Watch the method: press play to see the winning idea run, or step through it move by move.
The king is hiding on h8, a dark corner where your light-squared bishop can never give mate. You must walk it along the eighth rank to a8, a light corner. The knight does the guiding, and its five jumps trace a W: f7, e5, d7, c5, b7.
The trickiest phase of the bishop and knight mate is the wrong corner. The king dives into a corner the bishop cannot reach, and you must relocate it without ever letting it break free.
Why it is hard. Mate happens only in a corner of the bishop's color. If the king sits in the opposite corner, no checkmate exists there, so you have to march it across the edge.
The W-maneuver. The knight zigzags in a W pattern, controlling the squares just ahead of the king while the bishop and king form a moving cage that shepherds the defender toward the correct corner.
In this drill the defender clings to the safe corner and squirms toward the center at every chance. Execute the W cleanly and the win is guaranteed inside the fifty-move limit.