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Winning blow: rook to b7 (b3·6)

Shuffle Rating 1430Theme: 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 1430 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 b1, queen f2, rook f1 b3, bishop e1, knight c4, pawn b2 c2 h2 d3 a4.

Black: king c7, queen f5, rook g8, bishop d6 f7, knight g5 c6, pawn f4 a5 c5 a6 d7 h7.

11 white and 13 black pieces are on the board; the puzzle position arises after move 22.

The position in numbers

Black are ahead by 2 points of material (30 against 32; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on b1, the black king on c7.

It is White to move on move 22, with 38 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 5 pawns, Black 6. Files fully open (no pawns of either colour): e, g — natural highways for the rooks and queen. Half-open for White: f.

Black hold the bishop pair, an edge in open lines. The White king has 3 empty squares to step to right now — the fewer they are, the closer a mating net.

Solution & explanation

Main line

22. Rb7+ Kd8 23. Nxd6 Qe5 24. Qxf4 Qxf4 25. Rxf4

Why it works

  • Great move! rook to b7 keeps the pressure (+4.7).
  • Well found: knight to d6 (+4.9).
  • Precise: queen to f4 is the top choice (+4.6).
  • Great move! rook to f4 keeps the pressure (+4.8).
  • You win a piece — the queen.
  • If instead Kd8, then Nxd6 and you win the bishop.

Move by move

  • 22. Rb7+ — rook to b7 with check
  • Kd8 — king to d8
  • 23. Nxd6 — knight to d6 (capture)
  • Qe5 — queen to e5
  • 24. Qxf4 — queen to f4 (capture)
  • Qxf4 — queen to f4 (capture)
  • 25. Rxf4 — rook to f4 (capture)

Types in this puzzle

Clearance

Clear your own piece out of the way — with tempo — for the decisive blow.

Clearance is about your own piece standing in the way of the decisive blow — so you move it aside, or even throw it away. The key is to clear with tempo: jump off with a check, a capture or a threat, giving the opponent no time to regroup. The telltale sign: you see a crushing queen or rook move, but one of your own pieces blocks the line or occupies the square. Do not cling to it — a clearance sacrifice usually costs less than a missed attack.

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.

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.

About this position

These pieces come from starting position #745.

SP-745 · RampartGuard — The king starts out on a wing file, b or g, with neither knight in a corner.

The king starts on b1, the rooks on a1 and h1, the queen on g1.

From b1 the king makes the longest journey Chess960 allows when castling short: five squares to g1.

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 RampartGuard family; read right to left it becomes position 409.

The engine's main line opens with a4.

Morozov Balance Index: 91 of 100 — class A — most balanced. Engine evaluation of the starting position: +13 centipawns for White (depth 44, 400 000 000 nodes).

In 50 self-play games White scored 52.0% (95% CI 38.5–65.2%).

Explore position #745

Provenance

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

Pack 011 · SP-745

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