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Winning blow: king to b1

c9-03217
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.

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.

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 c1, queen d1, rook e1, bishop a1 a6, knight h1 f3, pawn d2 f2 g2 h2 c3 e4 c6.

Black: king b8, queen d8, rook b1 e8, bishop f8, knight g6 g8, pawn a4 e5 a7 c7 d7 f7 g7 h7.

14 white and 15 black pieces are on the board; the puzzle position arises after move 9.

The position in numbers

Black are ahead by 3 points of material (33 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 c1, the black king on b8.

It is White to move on move 9, with 2 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. Files fully open (no pawns of either colour): b — natural highways for the rooks and queen. Half-open for White: a.

White hold the bishop pair, an edge in open lines. 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

9. Kxb1 Re6 10. Qxa4 Rxc6 11. Kc2

Why it works

  • Great move! king to b1 keeps the pressure (+4.4).
  • Spot on — queen to a4 (+4.2).
  • A natural move: king to c2.
  • You win a piece — the rook.
  • If instead Re6, then Bb5 and you win the rook.

Move by move

  • 9. Kxb1 — king to b1 (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.

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.

Development punish

Half the army still asleep — the attack breaks through.

Punishing lazy development: half of your opponent's army is asleep on its starting squares, which means you outnumber him where the fight is. Count not the pieces on the board but the pieces in play — if five or more of his pieces have never moved, look for a forcing attack. The sign is a development lead plus open lines toward his king. Strike immediately: give him two quiet moves and the advantage evaporates.

About this position

These pieces come from starting position #898.

SP-898 · BastionScout — A knight on the a- or h-file, king on c or f — the mirror twin lands here as well.

The king starts on c1, the rooks on b1 and e1, the queen on d1.

The king already stands on c1, so castling long moves only the rook, from b1 to d1.

A bishop starts in the corner on a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.

The second rank carries 2 pawns with no defender at all: a2, h2.

The setup belongs to the BastionScout family; read right to left it becomes position 55.

The engine's main line opens with f4.

Morozov Balance Index: 51 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +26 centipawns for White (depth 45, 400 000 000 nodes).

Explore position #898

Provenance

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

Verified by Stockfish at depth 20+.

Solution forcedness confirmed (verified).

Pack 002 · SP-898

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