Mate in 3: fork on e8
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The tactical motive
Deflection: force the defender to abandon its post.
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 1196 ShuffleRating — club-player level.
White to move — find the best continuation
How to recognize this tactic
Deflection drags a defender away from its duty. Identify the enemy piece that guards a key square or mate, then force it to move — with a check, a capture or a threat it must answer — and strike where it no longer defends.
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 h2, queen c6, knight e5, pawn f2 g2 h3 e4.
Black: king g8, queen a6, rook a1 b2, bishop e7, pawn d4 c5 b6 f7 g7 h7.
7 white and 11 black pieces are on the board; the puzzle position arises after move 38.
The position in numbers
Black are ahead by 12 points of material (16 against 28; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h2, the black king on g8.
It is White to move on move 38, with 29 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 6. Files fully open (no pawns of either colour): a — natural highways for the rooks and queen. Half-open for White: b, c, d.
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
38. Qe8+ Bf8 39. Qxf7+ Kh8 40. Qxf8#
Why it works
- Great move! queen to e8 keeps the pressure (#2).
- Well found: queen to f7 (#1).
- Strong! queen to f8 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Bf8, then Qxf7+ and you stay on top.
Move by move
- 38. Qe8+ — queen to e8 with check
- Bf8 — bishop to f8
- 39. Qxf7+ — queen to f7 (capture) with check
- Kh8 — king to h8
- 40. Qxf8# — queen to f8 (capture) and it is checkmate
Types in this puzzle
Back-rank mate
The king is locked behind its own pawns — a heavy piece strikes the last rank.
The back-rank mate strikes a king locked behind its own unmoved pawns when a rook or queen crashes onto the last rank. The signs: no escape hole in front of the king, and the back rank guarded by a single piece or by nobody at all. Often that lone guard is deflected or traded off first, and only then comes the invasion. In your own games, make luft in time — one pawn move prevents a sudden catastrophe.
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 007
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