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Winning blow: queen to b6 (e3)

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.

A fork made possible by the Chess960 piece placement.

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.

A set-up fork needs one preparing move before the fork lands — a check that drives the king onto the forking square, or a capture that lines the targets up. Find the preparation first, then the fork it makes possible.

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 e3, rook f7, bishop g2 c3, pawn a2 c2 b4 h4 g5 e6.

Black: king b8, queen e8, rook d8, bishop a8, knight e7, pawn a5 b5 d6 g6 h7.

11 white and 10 black pieces are on the board; the puzzle position arises after move 30.

The position in numbers

White are ahead by 1 points of material (26 against 25; 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 30, with 52 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

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

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

30. Qb6+ Kc8 31. Qa6+ Kc7 32. Qa7+ Kc8 33. Qxa8+

Why it works

  • Great move! queen to b6 keeps the pressure (#4).
  • Spot on — queen to a6 (#3).
  • Precise: queen to a7 is the top choice (#2).
  • Best move. queen to a8 is exactly what the engine plays (#1).
  • You win a piece — the bishop.
  • If instead Kc8, then Qa6+ and you stay on top.

Move by move

  • 30. Qb6+ — queen to b6 with check
  • Kc8 — king to c8
  • 31. Qa6+ — queen to a6 with check
  • Kc7 — king to c7
  • 32. Qa7+ — queen to a7 with check
  • Kc8 — king to c8
  • 33. Qxa8+ — queen to a8 (capture) with check

Types in this puzzle

Setup fork

The random setup allows a fork that classical chess never sees.

A setup fork is a double attack that exists only because of the unusual starting squares — in classical chess these targets never stand side by side. Look for pairs of undefended pieces on your opponent's back rank and for squares from which a knight or pawn hits both at once. Such forks usually appear within the first moves, before the pieces disperse. In every new position, note right away which starting pieces are defended by no one.

Check chase

Every move is a check — the king is chased into losing ground.

In a check chase every one of your moves is a check, so the opponent never gets a free second. The king is herded across the board until it loses a piece or walks into a decisive blow. Such lines are the easiest to calculate: each check allows only a handful of replies, so try them all. Make it a habit to start calculating any sharp position with the checks — they are the most forcing moves on the board.

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 #915.

SP-915 · BastionGuard — King shifted to c or f, knights kept clear of the edges — 168 positions in all.

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

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.

One second-rank pawn starts with no defender at all: a2.

The setup belongs to the BastionGuard family; read right to left it becomes position 35.

The engine's main line opens with e4, putting a pawn straight into the centre.

Morozov Balance Index: 55 of 100 — class B — balanced. Engine evaluation of the starting position: +25 centipawns for White (depth 44, 400 000 000 nodes).

Explore position #915

Provenance

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

Pack 008 · SP-915

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