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Winning blow: pawn to b7 (a6·6)

Shuffle Rating 1200Theme: 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 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.

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 b1, bishop e5, pawn c2 d2 f2 h2 a4 g4 a6 f6.

Black: king d8, queen b7, rook a8, bishop f8, knight b6, pawn d6 g6 c7 h7.

11 white and 9 black pieces are on the board; the puzzle position arises after move 22.

The position in numbers

Black are ahead by 8 points of material (16 against 24; 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 d8.

It is White to move on move 22, with 31 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 8 pawns, Black 4. Files fully open (no pawns of either colour): b, e — natural highways for the rooks and queen.

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

22. axb7 Rb8 23. Bd4 c5 24. Bxc5 dxc5 25. Rxb6

Why it works

  • Great move! pawn to b7 keeps the pressure (+3.1).
  • Well found: bishop to d4 (+3.2).
  • Precise: bishop to c5 is the top choice (+3.6).
  • Great move! rook to b6 keeps the pressure (+3.2).
  • You win a piece — the queen.
  • If instead Rb8, then Bd4 and you win the queen.

Move by move

  • 22. axb7 — pawn to b7 (capture)
  • Rb8 — rook to b8
  • 23. Bd4 — bishop to d4
  • c5 — pawn to c5
  • 24. Bxc5 — bishop to c5 (capture)
  • dxc5 — pawn to c5 (capture)
  • 25. Rxb6 — rook to b6 (capture)

Types in this puzzle

Remove the defender

Capture the guard first — then take what it protected.

Removing the defender is the straightforward plan: capture the guard first, then take what it guarded. Unlike deflection, the defender is not lured away — it is traded off or destroyed on the spot. Stare at the target you crave and ask who defends it, and whether that defender can be profitably eaten. Count the whole capture sequence, not just the first move — the trade must pay off at the end.

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 #946.

SP-946 · BastionGuard — Both knights begin inside the board while the king stands on c or f; a position and its mirror twin share this family.

The king starts on c1, the rooks on b1 and d1, the queen on h1.

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, f2.

The setup belongs to the BastionGuard family; read right to left it becomes position 7.

The engine's main line opens with g3.

Morozov Balance Index: 28 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +33 centipawns for White (depth 43, 400 000 000 nodes).

Explore position #946

Provenance

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

Pack 008 · SP-946

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