Bishop and Knight Checkmate
The most difficult basic checkmate in chess, requiring precise technique to drive the king to the correct corner.
Published 2026-02-01 | Last verified 2026-02-12
Professor Archer says: The bishop and knight checkmate is the Mount Everest of basic endgame technique. Many strong players have never practiced it and pray they will never need it. But I have seen grandmasters fail to deliver this checkmate in tournament games, losing half a point because they ran out of moves. Do not be that player. Learn the technique, practice it until it is automatic, and you will never have to worry about it again.
The Challenge
Bishop and knight checkmate is the hardest of the basic mating techniques because the knight's limited range makes it difficult to control the enemy king. Unlike two bishops, which cover all squares together, a bishop and knight leave gaps that the defending king can exploit.
The critical requirement is that the king must be driven to the corner that matches the bishop's color. A dark-squared bishop requires the king to be mated in a dark-squared corner (a1 or h8 for a dark-squared bishop). If the king reaches the wrong corner, the checkmate cannot be forced there.
The entire process takes up to 33 moves with optimal play, which is uncomfortably close to the 50-move rule in practical games. This is why practicing the technique is essential: wasted moves in a real game can lead to a draw by the 50-move rule.
Driving the King to the Correct Corner
In this position, White has a dark-squared bishop, so the king must be driven to a1 or h8 (the dark-squared corners). The defending king will naturally try to escape to the light-squared corners (a8 or h1), where checkmate cannot be forced.
The technique involves using all three pieces in coordination. The bishop controls diagonals of one color, the knight hops to cover key squares, and the king leads the way by establishing dominance in the center and then guiding the enemy king toward the correct corner.
Position (FEN): 8/8/8/8/3k4/8/1BN5/4K3 w - - 0 1
White must drive the black king to a light-squared corner (a1 or h8) for checkmate.
The W-Maneuver
When the defending king reaches the wrong corner, you need the W-maneuver (also called the Deletang triangles) to redirect it. This technique uses the knight and bishop to create a series of barriers that guide the king from the wrong corner to the correct one.
The name "W-maneuver" comes from the path the knight traces as it hops from square to square, creating a zigzag pattern that resembles the letter W. Each knight move blocks an escape route, and the bishop covers the diagonal, forcing the king to march along the edge toward the correct corner.
This is the phase where most players go wrong. Without knowing the W-maneuver, the knight seems to stumble around aimlessly while the king escapes. With the technique, the knight's moves are purposeful and the king's journey to the correct corner is inevitable.
Should You Even Learn It?
Honest answer: this ending appears in maybe one game in five thousand, and famous grandmasters have failed to convert it under the clock, with the fifty-move rule ticking. If your study time is scarce, rook endgames and king-and-pawn endgames repay it fifty times more often. Nobody should feel guilty about postponing the bishop and knight mate until they are comfortably past club level.
The case FOR learning it has little to do with frequency. Mastering the W-maneuver teaches piece coordination at its purest: three pieces with completely different movement patterns herding a king along a precise route, with zero margin for waste because the fifty-move rule is always in the background. Players who put in the two or three hours it takes report that their knight handling improves everywhere. If you do learn it, drill it against an engine until you can finish from any starting position in under forty moves; a checkmate you can only execute slowly is a checkmate you do not own. Set up practice positions in our board editor and race the move counter.
Bishop and Knight Checkmate FAQ
How many moves does it take?
With optimal play, the maximum is 33 moves from the worst starting position. In practice, you need to complete it within the 50-move rule (50 moves without a pawn move or capture), so there is little room for error.
What happens if the king reaches the wrong corner?
The king can always be driven from the wrong corner to the correct one using the W-maneuver. It takes additional moves but is always achievable with correct technique.
Can I avoid this endgame in practical play?
You cannot always control what ending you reach. While bishop and knight vs king is rare, it does occur in tournament games. Being prepared for it means you will never lose half a point needlessly.
Professor Archer says: The hardest part of this checkmate is driving the king to the correct corner, the one controlled by your bishop. Once the king is there, the mate is straightforward. The W-maneuver is the standard technique for redirecting the king when it tries to escape to the wrong corner. Master the W-pattern and the rest follows naturally.
Quick Quiz
Why must the defending king be driven to the corner matching the bishop's color?
- Because checkmate requires the bishop to control the corner escape diagonal, which only works on its own color (Correct) - Correct. The final mating pattern requires the bishop to cover the diagonal near the corner. Since the bishop only controls one color of squares, the corner must match. In the wrong corner, the bishop cannot cover the escape squares.
- Because the knight is stronger on squares matching the bishop's color - The knight can operate on any color square. The reason is about the bishop: it can only cover the escape diagonal in a corner of its own color.
- Because the king moves faster on squares matching the bishop - The king moves at the same speed on all squares. The correct corner matters because the bishop needs to control the escape diagonal near the corner for the checkmate to work.
- Because it is a rule of chess that you must use the matching corner - There is no such rule. The reason is geometric: the checkmate pattern only works when the bishop can control the diagonal near the corner, which requires the corner to be on the bishop's color.