King and Queen vs King

King and queen against a lone king is the checkmate that ends more games than any other, because nearly every winning endgame funnels into it the moment a pawn promotes. The method has three parts: confine the enemy king with the queen alone, walk your own king across the board, and deliver mate on the edge. From the worst possible starting position it takes exactly ten moves — and the only genuine danger along the way is one of the two stalemate traps that every beginner falls into at least once.

Why the Queen Cannot Mate Alone

A queen is the strongest piece on the board and still cannot checkmate a bare king by herself. Look at any checkmate picture in this endgame and you will see why: the queen delivers the check, but something else must take away the escape squares, and the only something else you have is your king. Both final patterns need it. In the first, the queen stands directly in front of the enemy king, protected by her own king one square away — the queen on b7, kings on b6 and b8. In the second, the queen checks along the edge from a distance — queen on d8 against a king on b8 — while your king on b6 covers the seventh-rank escape squares a7, b7, and c7.

That observation dictates the whole plan. Checking over and over with the queen feels forceful and achieves nothing: the king simply strolls toward the center, and no sequence of checks alone will ever push it back. Instead the queen must do the one thing she does better than any piece — imprison the king without checking at all — while your king makes the slow walk that actually wins the game.

The Box Method and the Knight's-Move Shadow

The queen confines the king by cutting off ranks, files, and diagonals at once — club players learn this as the box method: build a box around the king, and every time he steps backward, shrink it. The fastest version of the box is a trick I show every student on day one. Place the queen exactly a knight's move away from the enemy king, and then copy his moves like a shadow: whenever he steps, step so that you are a knight's move away again. The geometry is magic — from knight distance the queen always cuts off both the rank and the file the king would need to come forward, so he can only retreat.

1.Qg4! takes up the shadow post — g4 is a knight's move from the king on e5. Now watch the mirror: 1...Kd5 2.Qf4 Kc5 3.Qe4 Kb5 4.Qd4 Kc6 5.Qe5 Kb6 6.Qd5 Kc7 7.Qe6 Kb7 8.Qd6 Kc8 9.Qe7 Kb8 10.Qd7 and after 10...Ka8 the king is sealed in the corner with only a8 and b8 to shuffle between. Ten queen moves, zero checks, zero thinking — every move simply restored the knight's-move distance.

And here the shadow must stop. One more mirror move — 11.Qc7?? or 11.Qb6?? — is stalemate, because both squares are a knight's move from a8, and from there the queen covers a7, b7, and b8 all at once. The rule I drill: the moment the defending king is trapped on the edge with two squares left, the queen is finished. She freezes, and the king marches.

March the King and Deliver Mate

With the enemy king shuffling between a8 and b8, your king's route is completely safe — nothing on the board can touch it.

1.Kd2 Kb8 2.Kc3 Ka8 3.Kc4 Kb8 4.Kc5 Ka8 5.Kb6! The king takes up its post beside the corner, covering a7 and b7. Black has only 5...Kb8, and now both mating pictures from earlier are on the board at once: 6.Qb7# — the supported mate — or equally 6.Qd8#, the edge check with the king covering the seventh rank. Six moves of pure technique.

Notice what the queen did during the march: nothing. She sat on d7 holding the cage. Beginners lose patience here and start checking, which only shakes the king loose. The queen's job ended on move ten of the previous diagram; the king finishes the game.

The Two Stalemate Traps

Both classic accidents in this endgame have names in my lessons, and both are worth knowing by their exact squares.

The knight's-move trap. Queen on c7 or b6 against a king on a8 — or the mirrored g6 against h8, g3 against h1, and so on around the board. A queen a knight's move from a cornered king covers all three of its squares without giving check: stalemate. This is the shadow technique's one poisoned square, which is why the shadow stops the instant the king reaches the edge. Every one of these positions is a tablebase draw, and every one of them has cost somebody a tournament game.

The suffocation trap. The same accident in slow motion: while your king ambles over, some careless queen move takes away the cornered king's last square. In the diagram above, imagine the queen drifting from d7 to c7 "to be closer" while the king sits on a8 — game drawn on the spot. The working habit that prevents both traps costs one second per move: after every queen move near a confined king, ask "does he have a reply?" If the answer is ever no and he is not in check, you have thrown away the win.

Half a point saved per year, guaranteed.

How Long Should It Take?

Checked against the tablebase: the worst position in the entire endgame — white king buried on h8, queen on g7, black king on c4 — is mate in ten moves. A typical position after promotion takes six to eight. The fifty-move rule is never remotely in danger, so there is no reason to rush, and rushing is the only way to lose the half point. If you have never done it, set up the first diagram and play it out against an engine until the shadow, the stop, and the king march are automatic — this is the foundation for king and rook vs king and every mating technique after it, and the endpoint of every queen vs pawn race you win. A fuller tour of the elementary mates lives in the guide on how to checkmate.

Frequently Asked Questions

Can a queen checkmate a king by herself?

No. A queen alone can confine a bare king to the edge but never mate it, because every checking position leaves at least one escape square that only the attacking king can cover. All checkmates in this endgame use both pieces.

What is the fastest way to checkmate with king and queen?

Use the knight's-move shadow: park the queen a knight's move from the enemy king and copy his moves until he is trapped on the edge, then stop and walk your king over. From any legal position this wins in at most ten moves, with mate delivered beside your own king.

Why do beginners stalemate with a queen so often?

Because the queen covers so many squares that a cornered king often has none left. The classic accident is queen a knight's move from a king in the corner — c7 or b6 against a8 — covering a7, b7, and b8 with no check. One habit prevents it: after each queen move, confirm the defender still has a reply.

Do I need to drive the king into a corner?

No — any edge square works. Unlike the two-bishop or bishop-and-knight mates, king and queen mate happens anywhere on the rim: as soon as the defending king is stuck on an edge and your king arrives in front of it, both standard mating patterns are available.

Should I give checks while driving the king?

Almost never — checks let the king choose its direction and usually head for the center. Quiet confining moves take squares away permanently. The only check that matters is the last one, checkmate itself.