Attack on the uncastled king: pawn to c4 (b3·43)
c9-26768naming 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 f1, rook e1 g1, bishop a1 b1, knight d1 g3, pawn a2 d2 f2 g2 b3 f4 h5.
Black: king f8, queen c4, rook e8 g8, bishop a8 b8, knight c5, pawn e5 b6 f6 a7 c7 d7 g7 h7.
14 white and 15 black pieces are on the board; the puzzle position arises after move 10.
The position in numbers
Black are ahead by 7 points of material (29 against 36; 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 f8.
It is White to move on move 10, with 5 legal replies to weigh — only the line that keeps the advantage solves the puzzle. White are in check right now, so every reply must answer the check.
White keeps 7 pawns, Black 8. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: c, e.
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
10. bxc4 exf4 11. Rxe8+ Kxe8 12. Bxh7 fxg3 13. Bxg8
Why it works
- Great move! pawn to c4 keeps the pressure (+4.3).
- Spot on — rook to e8 (+4.2).
- Precise: bishop to h7 is the top choice (+4.5).
- Best move. bishop to g8 is exactly what the engine plays (+4.5).
- You win a piece — the queen.
- If instead exf4, then Rxe8+ and you win the queen.
Move by move
- 10. bxc4 — pawn to c4 (capture)
- exf4 — pawn to f4 (capture)
- 11. Rxe8+ — rook to e8 (capture) with check
- Kxe8 — king to e8 (capture)
- 12. Bxh7 — bishop to h7 (capture)
- fxg3 — pawn to g3 (capture)
- 13. Bxg8 — bishop to g8 (capture)
Types in this puzzle
King in the center
The king starts in the middle — and the storm reaches it first.
King in the center: in Chess960 the monarch may start on the d- or e-file, right in the line of fire, and the attack can reach him before he ever castles. The signs: the enemy king still sits on its central starting square while the files toward it are opening. Play to rip the center open — a pawn sacrifice usually pays off here. And if it is your king in the middle, castle at the very first opportunity.
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.
Overload
One defender guards two things — it cannot do both jobs.
Overloading exploits a defender with two jobs at once — guarding a piece and covering a mating square, for instance. It cannot do both: your first strike forces it to handle one duty and abandon the other. Find the overworked piece by asking what happens to each of its charges if it gets distracted. Then hit one target and collect the other — an overloaded defender only pretends to defend.
About this position
These pieces come from starting position #288.
SP-288 · BastionScout — King off-centre on c or f with a knight starting on the rim (a/h).
The king starts on f1, the rooks on e1 and g1, the queen on c1.
Castling short simply swaps the two pieces: the king on f1 and the rook on g1 trade places.
A bishop starts in the corner on a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.
One second-rank pawn starts with no defender at all: h2.
The setup belongs to the BastionScout family; read right to left it becomes position 383.
The engine's main line opens with Ng3, bringing the knight out to g3.
Morozov Balance Index: 72 of 100 — class B — balanced. Engine evaluation of the starting position: +20 centipawns for White (depth 48, 400 000 000 nodes).
Explore position #288Provenance
Mined from the project's engine self-play games.
Pack 008 · SP-288
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