Mate in 3: double attack on h3
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The tactical motive
Double attack: one move creates two threats at once.
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1809 ShuffleRating — for advanced tacticians.
Black to move — find the best continuation
How to recognize this tactic
A double attack threatens two things at once so the opponent cannot parry both. Look for a single move — often a queen or knight — that creates two separate threats, such as a check plus an attack on a loose piece.
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 b1 e1, knight f7, pawn a2 b2 h2 c3 f3 g3.
Black: king c8, rook d2, bishop e2, knight f4, pawn h5 a6 c6 b7 c7 g7.
10 white and 10 black pieces are on the board; the puzzle position arises after move 19.
The position in numbers
White are ahead by 2 points of material (19 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 c8.
It is Black to move on move 19, with 30 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): d, e — natural highways for the rooks and queen. Half-open for Black: f.
The Black king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
19... Nh3+ 20. Kg2 Bf1+ 21. Kxf1 Rf2#
Why it works
- Great move! knight to h3 keeps the pressure (#2).
- Well found: bishop to f1 (#1).
- Strong! rook to f2 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Kg2, then Bf1+ and you stay on top.
Move by move
- 19… Nh3+ — knight to h3 with check
- 20. Kg2 — king to g2
- Bf1+ — bishop to f1 with check
- 21. Kxf1 — king to f1 (capture)
- Rf2# — rook to f2 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.
Endgame tactic
Tactics live in the endgame too — strike while material is scarce.
Tactics do not retire when the queens come off: forks, pins and double attacks live on in the endgame. With so little material left, every tactical loss is almost always decisive. The signs are the usual ones — undefended pieces, king and piece on one line, a pawn about to promote. Even in a "technical" ending, scan for a shot before every move, both yours and your opponent's.
Provenance
Derived from the Lichess puzzle database (CC0).
Pack 013
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