Winning blow: knight to f1 (d2)
c9-25997naming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Chess960 twist: use the unusual starting setup of the pieces.
Winning tactic: there is a move that gains a decisive advantage — find it.
Difficulty 1200 ShuffleRating — club-player level.
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.
This position hides a concrete tactic that wins material or mates. Start with the most forcing candidate moves — checks, captures and threats — and calculate each to a clear end before choosing; the winning line is usually the one the opponent cannot meet.
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 b2, bishop e6, knight d2, pawn h2 b3 c3 g3 a4 e5.
Black: king c7, rook f1, bishop a5, knight a6, pawn h3 c6 a7 b7 e7.
9 white and 9 black pieces are on the board; the puzzle position arises after move 28.
The position in numbers
Black are ahead by 4 points of material (12 against 16; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on b2, the black king on c7.
It is White to move on move 28, with 20 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 5. Files fully open (no pawns of either colour): d, f — natural highways for the rooks and queen.
The White king has 3 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
28. Nxf1 Nc5 29. Bf5 Nd7 30. e6 Nf6 31. Bxh3
Why it works
- Great move! knight to f1 keeps the pressure (+2.3).
- bishop to f5 develops smoothly.
- A natural move: pawn to e6.
- Best move. bishop to h3 is exactly what the engine plays (+2.5).
- You win a piece — the rook.
- If instead Nc5, then Bf5 and you win the rook.
Move by move
- 28. Nxf1 — knight to f1 (capture)
- Nc5 — knight to c5
- 29. Bf5 — bishop to f5
- Nd7 — knight to d7
- 30. e6 — pawn to e6
- Nf6 — knight to f6
- 31. Bxh3 — bishop to h3 (capture)
Types in this puzzle
Winning blow
Find the strike that wins material by force.
A winning blow is a forced material gain that does not fit a single textbook motif. The general tactical recipe applies: spot loose pieces, an awkwardly placed king, overloaded lines. Go through the forcing moves in order of violence — checks, captures, threats — because most combinations start with one of them. Do not judge by feel: calculate the concrete line until the outcome is beyond doubt.
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.
About this position
These pieces come from starting position #637.
SP-637 · BastionScout — A c- or f-file king with at least one knight out on the edge.
The king starts on c1, the rooks on a1 and f1, the queen on e1.
The king already stands on c1, so castling long moves only the rook, from a1 to d1.
The bishops stand on d1 and g1; their long diagonals reach h5 and a7 once the e- and f-pawns step aside.
One second-rank pawn starts with no defender at all: g2.
The setup belongs to the BastionScout family; read right to left it becomes position 232.
The engine's main line opens with e4, putting a pawn straight into the centre.
Morozov Balance Index: 39 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +21 centipawns for White (depth 44, 400 000 000 nodes).
In 50 self-play games White scored 57.0% (95% CI 43.3–69.7%).
Explore position #637Provenance
Mined from the project's engine self-play games.
Pack 008 · SP-637
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