Attack on the uncastled king: rook to e1 (f1·3)
c9-12768naming 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.
Uncastled king: the enemy king is stuck in the centre — punish it before it castles.
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.
An uncastled king in the centre is a standing target. Look for ways to open the central files and diagonals against it with checks and threats before it can shelter — every tempo the king spends in the middle is a chance for a combination.
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 g1, rook f1 h3, bishop d6, knight d5, pawn a2 d2 f2 g2 b3 c4 h4.
Black: king g8, queen e1, rook f8 h8, bishop d3, knight c6, pawn c5 h5 b6 a7 d7 f7 g7.
12 white and 13 black pieces are on the board; the puzzle position arises after move 13.
The position in numbers
Black are ahead by 9 points of material (23 against 32; 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 g8.
It is White to move on move 13, with 33 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 7. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen.
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
13. Rxe1 Bf5 14. Rg3 g6 15. Nf6+ Kg7 16. Bxf8+
Why it works
- Great move! rook to e1 keeps the pressure (+2.5).
- rook to g3 develops smoothly.
- Precise: knight to f6 is the top choice (+2.6).
- Brilliant! The bishop on f8 is a sacrifice that works — you stand better (+2.3).
- You win a piece — the queen.
- If instead Bf5, then Rg3 and you win the queen.
Move by move
- 13. Rxe1 — rook to e1 (capture)
- Bf5 — bishop to f5
- 14. Rg3 — rook to g3
- g6 — pawn to g6
- 15. Nf6+ — knight to f6 with check
- Kg7 — king to g7
- 16. Bxf8+ — bishop to f8 (capture) with check
Types in this puzzle
Absolute pin
A piece is pinned against its king — it cannot legally move.
An absolute pin freezes a piece on the line between its own king and your long-range attacker: moving it is simply illegal. The pattern is three units on one straight line — your bishop, rook or queen, an enemy piece, and the enemy king behind it. A pinned piece neither attacks nor defends anything: treat it as if it were off the board. Pile up on it, ideally with a pawn, because running away is against the rules.
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.
Uncastled king
The king lingered in the middle — punish the delay.
Punishing the uncastled king: your opponent delayed castling, and now his king is stuck on its starting square under fire. In Chess960 this is deadlier than in classical chess — the king may start in the center or near the edge, and the familiar defensive setups simply do not apply. The signs: the victim still holds castling rights, and the files toward his king are half-open. Open lines before the king manages to hide.
About this position
These pieces come from starting position #32.
SP-32 · RampartGuard — A b- or g-file king and two knights on inner files (b–g).
The king starts on g1, the rooks on f1 and h1, the queen on e1.
The king already stands on its castled square, so castling short moves only the rook, from h1 to f1.
A bishop starts in the corner on a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.
The pawn on g2 is defended by the king alone — the same soft spot f2 is in the classical setup.
The setup belongs to the RampartGuard family; read right to left it becomes position 927.
The engine's main line opens with h4.
Morozov Balance Index: 4 of 100 — class D — largest edge. Engine evaluation of the starting position: +50 centipawns for White (depth 49, 400 000 000 nodes).
Explore position #32Provenance
Mined from the project's engine self-play games.
Pack 008 · SP-32
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