Mate in 3: queen to b8 (b3·2)
li-0MCUFnaming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1863 ShuffleRating — for advanced tacticians.
White to move — find the best continuation
How to recognize this tactic
In a mate in three every move must be forcing; the defender should never get a free tempo. Find the check or threat that herds the king, calculate the single defence to each, and confirm the net closes on the third move.
General method: before you move, list the forcing candidates — every check, every capture, every direct threat — and calculate those first. The solution to a tactic is almost always among them.
Position on the board
White: king h1, queen b3, rook e1 f1, bishop a7, knight c3, pawn a2 b2 c2 g2 d5.
Black: king c8, queen g3, rook d8 h8, bishop f8, knight f6, pawn h3 f4 c6 d6 h6 c7 f7.
11 white and 13 black pieces are on the board; the puzzle position arises after move 18.
The position in numbers
Black are ahead by 2 points of material (30 against 32; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h1, the black king on c8.
It is White to move on move 18, with 41 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 7. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for White: f, h.
The White king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
18. Qb8+ Kd7 19. dxc6+ Kxc6 20. Qb5#
Why it works
- Great move! queen to b8 keeps the pressure (#2).
- Well found: pawn to c6 (#1).
- Strong! queen to b5 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Kd7, then dxc6+ and you stay on top.
Move by move
- 18. Qb8+ — queen to b8 with check
- Kd7 — king to d7
- 19. dxc6+ — pawn to c6 (capture) with check
- Kxc6 — king to c6 (capture)
- 20. Qb5# — queen to b5 and it is checkmate
Types in this puzzle
Supported queen mate
The queen delivers mate face to face, protected by a friend.
The supported queen mate is the most common pattern of all: the queen lands next to the king and mates because a friendly piece or pawn protects her. The king is helpless — capturing is impossible, and the queen covers every neighboring square herself. Hunt for a protected square beside the enemy king: a knight, bishop or pawn eyeing it turns her invasion into mate. Verify one thing — that the square really is defended, or the king eats her.
Only move
Everything else loses — find the only move that holds.
An only move is a position where everything loses except one single continuation. You cannot play "by hand" here: run through fundamentally different defenses — run away, block, trade, counterattack — and discard the ones that fail. The hallmark of these puzzles is that the obvious moves lose quickly while the solution often looks strange. First understand exactly what the threat is — then the one saving move reveals itself.
Mate in 3
A forced checkmate in three moves.
Mate in three is a forced staircase: each of your moves narrows the opponent's choices, and the third one ends the game. Look for the start among checks and sacrifices — quiet first moves are rare in mating problems, but deliciously sneaky. Keep the tree in your head: every defense gets its own branch. Do not stop calculating after move two — see the final mating picture with your own eyes.
Provenance
Derived from the Lichess puzzle database (CC0).
Pack 014
Similar puzzles
In your browser or in the Android app. Nothing to install · Free, no ads