Queen vs Bishop and Knight: The Karstedt Exception

White to play and draw

Play

Queen against bishop and knight usually wins, but this corner setup is one of the rare exceptions. The bishop guards the knight on e5, his king guards the bishop, and together they cover every square your king needs to come closer. The rule: recognize the setup, never let his pieces win your queen for nothing, and take the draw.

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Queen Against Bishop and Knight: The Rare Exception

White to play and draw · Hold the draw against perfect play

Waking the engine…

The theory

Watch the method: press play to see the winning idea run, or step through it move by move.

Look at the wall. The knight on e5 covers f7 and g6, and the bishop on g7 covers f6. First the trap: a careless check like Qf7+ only hangs the queen to the knight. With bishop and knight against your bare king, you lose: those two pieces can force mate.

A bishop and a knight normally lose against a queen. A handful of exceptions exist, and this one, from Karstedt in 1903, is the one to remember.

Why it holds. The knight on e5 and the bishop on g7 screen the black king from every approach square, and the bishop guards the knight while the king guards the bishop. The setup cannot be broken up: the bishop simply steps between g7 and h8 forever.

What it is not. This is not a general balance of material. Queen against bishop and knight is a win in the overwhelming majority of positions, so do not draw the wrong conclusion from this diagram.

In this drill you hold the queen and the honest result is a draw. Recognize the wall, avoid pointless risk, and bank the half point.

Keep going

Bishop Pawn: Winning With the Defender by the Corner

Black to play and win

Bishop Pawn: The King on the Wrong Side

Black to play and win

The Corner Trick: Invite the Promotion

Black to play and draw

All 18 queen endgames positionsFollow the full curriculum (free)