Mate in 3: rook to g3 (g4)
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The tactical motive
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1955 ShuffleRating — for advanced tacticians.
Black 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 c1 d8, bishop f1, knight g3, pawn a2 b2 f2 c4.
Black: king g7, rook g4 h7, bishop f5, pawn e3 f3 a6 g6.
9 white and 8 black pieces are on the board; the puzzle position arises after move 37.
The position in numbers
White are ahead by 3 points of material (20 against 17; 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 g7.
It is Black to move on move 37, with 28 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 4. Files fully open (no pawns of either colour): d, h — natural highways for the rooks and queen. Half-open for Black: b, c.
The Black king has 3 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
37... Rxg3+ 38. fxg3 f2+ 39. Kg2 Be4#
Why it works
- Great move! rook to g3 keeps the pressure (#2).
- Well found: pawn to f2 (#1).
- Strong! bishop to e4 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead fxg3, then f2+ and you stay on top.
Move by move
- 37… Rxg3+ — rook to g3 (capture) with check
- 38. fxg3 — pawn to g3 (capture)
- f2+ — pawn to f2 with check
- 39. Kg2 — king to g2
- Be4# — bishop to e4 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.
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.
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.
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 014
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