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Attack on the uncastled king: king to f2 (e1·5)

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 e1, queen d1, rook c1 h1, bishop a1 e2, knight b1 f3, pawn a3 b3 d3 e3 c4 h4 g5.

Black: king e8, queen d8, rook c8 h8, bishop e7 a8, knight f2 b8, pawn c5 b6 d6 e6 a7 f7 g7 h7.

15 white and 16 black pieces are on the board; the puzzle position arises after move 11.

The position in numbers

Black are ahead by 1 points of material (38 against 39; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on e1, the black king on e8.

It is White to move on move 11, with 32 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 7 pawns, Black 8. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: f.

The White king has 4 empty squares to step to right now — the fewer they are, the closer a mating net.

Solution & explanation

Main line

11. Kxf2 O-O 12. Qf1 f5 13. Qh3

Why it works

  • Great move! king to f2 keeps the pressure (+3.0).
  • Spot on — queen to f1 (+2.7).
  • A natural move: queen to h3.
  • You win a piece — the knight.
  • If instead O-O, then Qg1 and you win the knight.

Move by move

  • 11. Kxf2 — king to f2 (capture)

Types in this puzzle

Hanging piece

A piece is left without protection — just take it.

A hanging piece is simply an unprotected piece you can take for free. It sounds primitive, yet most amateur games are decided exactly this way. Build the habit: before every move, sweep the board and note every undefended piece, yours and theirs. The classic mistake is hunting for a brilliant combination when all you need to do is bend down and pick up the gift.

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 #226.

SP-226 · ThroneGuard — A centre-file king with no knight on the edge; a position and its mirror twin always share this family.

The king starts on e1, the rooks on c1 and h1, the queen on d1.

Castling ends where it always does: king to g1 and rook to f1 on the short side, king to c1 and rook to d1 on the long one.

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: a2.

The setup belongs to the ThroneGuard family; read right to left it becomes position 631.

The engine's main line opens with b4.

Morozov Balance Index: 97 of 100 — class A — most balanced. Engine evaluation of the starting position: +6 centipawns for White (depth 50, 400 000 000 nodes).

Explore position #226

Provenance

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

Verified by Stockfish at depth 20+.

Solution forcedness confirmed (verified).

Pack 002 · SP-226

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