Mate in 3: fork on f6
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The tactical motive
Fork: one piece attacks two targets at once — they can't both be saved.
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1840 ShuffleRating — for advanced tacticians.
White to move — find the best continuation
How to recognize this tactic
A fork is one piece attacking two targets at once. Look for a knight, pawn or queen move that lands where it hits the king (or a bigger piece) and a second undefended unit on the same turn — the opponent can save only one.
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 c1, queen g6, rook g1, bishop b2, pawn a2 c2 d2 f2 b3 h7.
Black: king h8, queen d8, rook f7 f8, knight a6, pawn d5 c6 f6 a7 b7.
10 white and 10 black pieces are on the board; the puzzle position arises after move 25.
The position in numbers
Black are ahead by 4 points of material (23 against 27; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on c1, the black king on h8.
It is White to move on move 25, with 38 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 5. Files fully open (no pawns of either colour): e, g — natural highways for the rooks and queen.
The White king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
25. Bxf6+ Qxf6 26. Qg8+ Rxg8 27. hxg8=Q#
Why it works
- Great move! bishop to f6 keeps the pressure (#2).
- Well found: queen to g8 (#1).
- Strong! pawn to g8 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Qxf6, then Qg8+ and you stay on top.
Move by move
- 25. Bxf6+ — bishop to f6 (capture) with check
- Qxf6 — queen to f6 (capture)
- 26. Qg8+ — queen to g8 with check
- Rxg8 — rook to g8 (capture)
- 27. hxg8=Q# — pawn to g8 (capture) 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).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 013
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