Mate in 3: rook to g7 (g4·2)
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The tactical motive
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1658 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 g1, rook g3 g4, bishop c5, pawn a2 b2 c2 h2.
Black: king h7, rook e8 h8, knight e5 c6, pawn f6 a7 b7 c7 g7.
8 white and 10 black pieces are on the board; the puzzle position arises after move 27.
The position in numbers
Black are ahead by 4 points of material (17 against 21; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on h7.
It is White to move on move 27, with 40 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 5. Files fully open (no pawns of either colour): d, e — natural highways for the rooks and queen. Half-open for White: f, g.
The White king has 4 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
27. Rxg7+ Kh6 28. Be3+ Kh5 29. Rh3#
Why it works
- Great move! rook to g7 keeps the pressure (#2).
- Well found: bishop to e3 (#1).
- Strong! rook to h3 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Kh6, then Be3+ and you stay on top.
Move by move
- 27. Rxg7+ — rook to g7 (capture) with check
- Kh6 — king to h6
- 28. Be3+ — bishop to e3 with check
- Kh5 — king to h5
- 29. Rh3# — rook to h3 and it is checkmate
Types in this puzzle
Ladder mate
Two heavy pieces climb line by line, cutting off every retreat.
The ladder mate uses two heavy pieces climbing rung by rung: one cuts the king off along a line, the other checks on the next line, driving him toward the edge. It is the classic two-rook technique — check, the king retreats one rank, the other rook checks, until mate on the last rank. The only danger is the king creeping close enough to attack one of your rooks. If it does, simply slide that rook to the far side of the same line.
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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