Mate in 2: discovered attack on f6 (e4)
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The tactical motive
Discovered attack: one piece steps aside, unleashing another's attack.
Mate in 2: the first move creates an unstoppable threat, the second delivers mate.
Difficulty 1828 ShuffleRating — for advanced tacticians.
White to move — find the best continuation
How to recognize this tactic
A discovered attack fires when one piece steps aside and unmasks the piece behind it. Look for your own units that block a rook, bishop or queen: moving the front piece — ideally with a threat of its own — springs two attacks in one move.
Mate in two usually opens with a forcing move — a check, a capture or an unstoppable threat — that strips the king of squares or defenders, so the follow-up mate becomes unavoidable. Look for the first move that leaves the opponent only losing replies.
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 b1, queen c2, rook e1 h1, knight e4 e5, pawn a2 b2 c4 d4.
Black: king g8, queen f4, rook a8 f8, bishop f3, knight e7 b8, pawn e6 a7 b7 c7 f7 g7 h7.
10 white and 14 black pieces are on the board; the puzzle position arises after move 17.
The position in numbers
Black are ahead by 6 points of material (29 against 35; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on b1, the black king on g8.
It is White to move on move 17, with 47 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 7. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: e, f, g, 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
17. Nf6+ gxf6 18. Qxh7#
Why it works
- Great move! knight to f6 keeps the pressure (#1).
- Well found: queen to h7 (#).
- The line ends in a forced mate in 2.
- If instead gxf6, then Qxh7# and it is mate.
Move by move
- 17. Nf6+ — knight to f6 with check
- gxf6 — pawn to f6 (capture)
- 18. Qxh7# — queen to h7 (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.
Mate in 2
A forced checkmate in two moves.
Mate in two: your move, any reply, then the mating blow. Start with the most forcing first moves — checks and sacrifices that shrink the opponent's options to almost nothing. Against every single reply you must have a mate ready, so check them all without exception. The common failure is analyzing the pretty defense and forgetting the boring one.
Relative pin
A piece shields a more valuable one behind it — moving it loses material.
In a relative pin the piece shields not its king but something valuable behind it, usually the queen. Moving is legal but costly, because the piece behind falls. Look for three units on one line: your long-range piece, a cheaper enemy piece, and an expensive one hiding behind. Beware the classic trap — a relatively pinned piece can still move with check or a bigger threat, so verify before you cash in.
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 013
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