Mate in 3: knight to g1
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The tactical motive
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 2348 ShuffleRating — expert level — few solve it at first try.
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 f1, rook h7, knight e2, pawn d2 b3 g3 a4 c4.
Black: king f3, rook f8, knight g4, pawn e3 e4 c5 f5 a7 b7.
8 white and 9 black pieces are on the board; the puzzle position arises after move 43.
The position in numbers
Black are ahead by 1 points of material (13 against 14; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on f1, the black king on f3.
It is White to move on move 43, with 25 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 6. Files fully open (no pawns of either colour): h — natural highways for the rooks and queen. Half-open for White: e, f.
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
43. Ng1+ Kxg3 44. Ne2+ Kf3 45. Rh3#
Why it works
- Great move! knight to g1 keeps the pressure (#2).
- Well found: knight to e2 (#1).
- Strong! rook to h3 is the sharp choice (#).
- The line ends in a forced mate in 3.
- If instead Kxg3, then Ne2+ and you stay on top.
Move by move
- 43. Ng1+ — knight to g1 with check
- Kxg3 — king to g3 (capture)
- 44. Ne2+ — knight to e2 with check
- Kf3 — king to f3
- 45. Rh3# — rook to h3 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.
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 015
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