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Winning blow: rook to b5 (b3)

Shuffle Rating 1010Theme: 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 1010 ShuffleRating — club-player level.

White to move — find the best continuation

Position on the board

White: king b1, queen a6, rook b3, bishop e5, knight g3, pawn b2 c2 g2 d4 h4.

Black: king c8, queen g4, rook b7, bishop b5 d8, pawn e3 a5 a7 c7 e7 h7.

10 white and 11 black pieces are on the board; the puzzle position arises after move 24.

Solution & explanation

Main line

24. Rxb5 Qd1+ 25. Ka2 Kd7 26. Rxb7

Why it works

  • Great move! rook to b5 keeps the pressure (+7.2).
  • king to a2 develops smoothly.
  • Precise: rook to b7 is the top choice (+7.5).
  • You win a piece — the rook.
  • If instead e6, then Qxb7+ and you win the rook.

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 #665.

SP-665 · BastionGuard — Off-centre king (c/f), no knight on the a- or h-file.

The king starts on c1, the rooks on a1 and f1, the queen on h1.

The king already stands on c1, so castling long moves only the rook, from a1 to d1.

The bishops stand on d1 and e1; their long diagonals reach h5 and a5 once the e- and d-pawns step aside.

The pawn on b2 is defended by the king alone — the same soft spot f2 is in the classical setup.

The setup belongs to the BastionGuard family; read right to left it becomes position 201.

The engine's main line opens with g4.

Morozov Balance Index: 42 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +22 centipawns for White (depth 44, 400 000 000 nodes).

In 50 self-play games White scored 56.0% (95% CI 42.3–68.8%).

Explore position #665

Provenance

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

Pack 006 · SP-665

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