Mate in 3: knight to f4
c9-12309Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Chess960 twist: use the unusual starting setup of the pieces.
Mate in 3: a forced sequence that ends in checkmate.
Difficulty 1630 ShuffleRating — for advanced tacticians.
White to move — find the best continuation
How to recognize this tactic
In Chess960 the pieces start on unfamiliar squares, so tactics appear earlier and from unusual angles. Do not trust classical patterns — read the actual lines of the bishops, the rooks and the queen from where they really stand in this position.
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 h1, rook f1 g8, bishop c1, knight h3, pawn a2 c2 g2 h2 d3 g5 e6.
Black: king h5, bishop c5, knight f7, pawn h4 a5 d5 f5 a7.
12 white and 8 black pieces are on the board; the puzzle position arises after move 26.
The position in numbers
White are ahead by 12 points of material (23 against 11; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h1, the black king on h5.
It is White to move on move 26, with 34 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 5. Files fully open (no pawns of either colour): b — natural highways for the rooks and queen. Half-open for White: f.
The White king has 0 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
26. Nf4+ Kg4 27. h3+ Kg3 28. Rf3#
Why it works
- Best move. knight to f4 is exactly what the engine plays (#2).
- Spot on — pawn to h3 (#1).
- Precise: rook to f3 is the top choice (#).
- The line ends in a forced mate in 3.
- If instead Kg4, then h3+ and you stay on top.
Move by move
- 26. Nf4+ — knight to f4 with check
- Kg4 — king to g4
- 27. h3+ — pawn to h3 with check
- Kg3 — king to g3
- 28. Rf3# — rook to f3 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.
About this position
These pieces come from starting position #325.
SP-325 · BastionScout — A c- or f-file king with at least one knight out on the edge.
The king starts on f1, the rooks on b1 and g1, the queen on e1.
Castling short simply swaps the two pieces: the king on f1 and the rook on g1 trade places.
The bishops stand on c1 and d1; their long diagonals reach h6 and h5 once the d- and e-pawns step aside.
The second rank carries 2 pawns with no defender at all: a2, h2.
The setup belongs to the BastionScout family; read right to left it becomes position 346.
The engine's main line opens with f4.
Morozov Balance Index: 47 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +27 centipawns for White (depth 46, 400 000 000 nodes).
Explore position #325Provenance
Mined from the project's engine self-play games.
Pack 012 · SP-325
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