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Attack on the uncastled king: bishop to d5 (h1)

Shuffle Rating 780Theme: Chess960 twist: use the unusual starting setup of the pieces.
White to move — find the best continuation

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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 780 ShuffleRating — for beginners taking their first steps in Chess960 tactics.

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, queen c2, rook d1 f1, bishop c1 h1, knight a5, pawn b2 e2 f2 h2 c3 g3.

Black: king e8, queen c7, rook d5 g8, bishop c8 h8, knight b6 e6, pawn a4 e5 a6 g6 f7 h7.

13 white and 14 black pieces are on the board; the puzzle position arises after move 13.

The position in numbers

Black are ahead by 3 points of material (34 against 37; 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 e8.

It is White to move on move 13, with 38 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for White: a.

The White king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.

Solution & explanation

Main line

13. Bxd5 O-O 14. Bg2 Bd7 15. Be3

Why it works

  • Great move! bishop to d5 keeps the pressure (+3.3).
  • bishop to g2 develops smoothly.
  • A natural move: bishop to e3.
  • You win a piece — the rook.
  • If instead O-O, then Bg2 and you win the rook.

Move by move

  • 13. Bxd5 — bishop to d5 (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.

Counter-strike

Don't defend — answer the threat with a bigger one.

The counter-strike: instead of defending against the threat, you answer with a bigger threat of your own. While your opponent grabs a pawn, you deliver mate — the arithmetic favors you. Look for a counter when direct defenses fail: do you have a check, an attack on the queen, a mating threat? The beginner's error is meeting every threat with a reflexive defense without checking the counterattacking resources first.

About this position

These pieces come from starting position #215.

SP-215 · ThroneScout — King in the middle of the rank, with a knight already committed to the corner.

The king starts on e1, the rooks on d1 and g1, the queen on b1.

The queenside rook already stands on d1, so castling long moves only the king, from e1 to c1.

A bishop starts in the corner on h1: it has a single diagonal, which the g-pawn unlocks, running out to a8.

The pawn on e2, f2 is defended by the king alone — the same soft spot f2 is in the classical setup.

The setup belongs to the ThroneScout family; read right to left it becomes position 642.

The engine's main line opens with d4, putting a pawn straight into the centre.

Morozov Balance Index: 91 of 100 — class A — most balanced. Engine evaluation of the starting position: +13 centipawns for White (depth 51, 400 000 000 nodes).

Explore position #215

Provenance

Mined from the project's engine self-play games.

Verified by Stockfish at depth 20+.

Solution forcedness confirmed (verified).

Pack 001 · SP-215

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