How to Checkmate With Bishop and Knight
The technique that separates real endgame players
To checkmate with bishop and knight, drive the enemy king to the edge with all three pieces, then walk it along the edge into a corner of your bishop's color: that is where the standard method forces mate. The defender runs for a wrong-colored corner, where the method cannot mate him, and the knight's W maneuver is how you march him out of it. It is a forced win in at most 33 accurate moves, and grandmasters have still failed it over the board.
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Play this ending (free)The method in three steps
Bishop and knight control different colors, so they can never build the tidy wall two bishops make. Worse, they cannot mate just anywhere. The standard method aims for a corner the bishop controls (with a light-squared bishop, a8 or h1), because that is where the king can always be driven and mated against the best defense. Special positions sometimes allow a forced mate elsewhere on the edge, but the defender knows the method and sprints for a wrong-colored corner, where it does not lead to mate. So the ending has three steps.
1. Drive the king to the edge. Any edge will do. King, bishop and knight close in together, the king leading.
2. Escort it out of the wrong corner. This is the W maneuver below, the famous part.
3. Mate it in the right corner. A typical final picture: black king on a8, your king on b6, the knight on d7 covering b8, and Bb7# along the long diagonal.
The W maneuver
To evict the king from the wrong corner and march it along the edge to the right one, the knight travels a W-shaped path, zigzagging between two ranks (driving a king along the 8th rank, the knight bounces between the 7th and 5th) while king and bishop take turns sealing the escape squares behind it. Each zigzag of the W hands the defending king one forced step in the right direction.
Here is how it starts, with a light-squared bishop. White: king f6, bishop f5, knight f7. Black: king e8, which has left the h8 corner and tries to slip out over c7. 1.Ne5 Kd8 2.Ke6 Kc7 3.Nd7! The knight takes b8, b6 and c5. 3...Kc6 4.Bd3! closes b5, the last open door, and the king has to come back: 4...Kc7 5.Bb5 (now c6 is gone too) 5...Kd8 6.Nc5. The knight has drawn f7, e5, d7, c5, the first strokes of the W, and the black king is confined to the a8 side, where it is driven into the corner and mated.
Don't memorize those squares, though: the defender varies. Learn the cage: at every moment, king, bishop and knight form a shrinking pocket whose only exit points toward the mating corner. The knight is the slow piece, so it moves early; the bishop is the fast one, so it does the last-second sealing. Played this way, the whole eviction takes about ten moves.
Train it or lose it
This is the mate where practice against perfect defense is non-negotiable: the defender here takes the longest legal road to the wrong corner, punishes every inaccuracy with a reset toward the center, and makes the 50-move rule a real deadline. If you can convert bishop and knight against an opponent that never resigns and never hurries, no human will ever escape you.
It is also, honestly, a rite of passage: the ending occurs rarely, but the piece coordination it teaches (three pieces working as one cage) upgrades every endgame you play.
Questions
In which corner can bishop and knight checkmate?
The standard method mates in a corner of the bishop's color: with a light-squared bishop, a8 or h1; with a dark-squared bishop, a1 or h8. That is where the king can always be driven and mated against the best defense. Some particular positions also allow a forced mate elsewhere on the edge, even next to a wrong-colored corner, but the method does not lead to mate in the other two corners, so that is where the defender runs.
How many moves does the bishop and knight mate need?
At most 33 moves from the worst winning position with perfect play: inside the 50-move rule, but with far less slack than any other basic mate. Sloppy technique regularly burns the budget.
Has anyone actually failed this mate in a real game?
Yes, including grandmasters and even world-class players: draws by the 50-move rule in bishop-and-knight endings happen at every level. It is the standard example of a technique you must drill before you need it.
Why can't a king and a single bishop checkmate?
One bishop (or one knight) alone cannot cover all the escape squares around the enemy king: it is insufficient mating material and the game is a draw. Adding the knight to the bishop is exactly what makes a forced mate possible.
What is the W maneuver?
The knight's zigzag path used to escort the defending king from the safe (wrong-colored) corner along the edge to the mating corner. Its route traces a W shape while the king and bishop seal the escape squares.
Don't just read it, play it
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Practice all 8 checkmates positionsFollow the full curriculum (free)or sharpen these endings in rated drills
Keep reading
How to Checkmate in Chess
The five endings every chess player must be able to finish
How to Checkmate With Two Bishops
Two diagonals side by side make an unbreakable wall
Two Knights Checkmate (Why It Fails)
Enough material to mate, and no way to force it
The 50-Move Rule
The clock that ticks under every long endgame
Schematic Thinking
Decide where the pieces belong. The move order comes after.