Mate in 3: pin on h7 (h5)
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The tactical motive
Mate in 3: a forced sequence that ends in checkmate.
Pin: a piece can't move without exposing something more valuable behind it.
Difficulty 1703 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.
A pin freezes a piece in front of a more valuable one behind it. Scan the ranks, files and diagonals your bishop, rook or queen controls: if an enemy piece cannot move without exposing its king or queen, it is pinned and can be piled on or bypassed.
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 g1, queen h5, rook a1 e5, bishop d3 d4, pawn a2 b2 c2 f2 g2 h2.
Black: king g8, queen c6, rook b8 e8, bishop e7, knight d7, pawn d5 a6 e6 g6 f7 h7.
12 white and 12 black pieces are on the board; the puzzle position arises after move 20.
The position in numbers
Material is level — 31 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g1, the black king on g8.
It is White to move on move 20, with 51 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: d, e.
White hold the bishop pair, an edge in open lines. 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
20. Qxh7+ Kxh7 21. Rh5+ Kg8 22. Rh8#
Why it works
- Great move! queen to h7 keeps the pressure (#2).
- Well found: rook to h5 (#1).
- Strong! rook to h8 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Kxh7, then Rh5+ and you stay on top.
Move by move
- 20. Qxh7+ — queen to h7 (capture) with check
- Kxh7 — king to h7 (capture)
- 21. Rh5+ — rook to h5 with check
- Kg8 — king to g8
- 22. Rh8# — rook to h8 and it is checkmate
Types in this puzzle
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.
Sacrifice attack
Give up material to unleash a decisive attack.
A sacrificial attack gives up material on purpose to rip the king's shelter open and launch a decisive assault. The sac is sound when you get concrete assets in return: open lines to the king, tempi, pieces ready to pour in. The signs: a poorly sheltered king, your forces aimed at its home, defenders stranded far away. The iron rule is to calculate, not hope — once the material is gone, there is no way back.
Absolute pin
A piece is pinned against its king — it cannot legally move.
An absolute pin freezes a piece on the line between its own king and your long-range attacker: moving it is simply illegal. The pattern is three units on one straight line — your bishop, rook or queen, an enemy piece, and the enemy king behind it. A pinned piece neither attacks nor defends anything: treat it as if it were off the board. Pile up on it, ideally with a pawn, because running away is against the rules.
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 013
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