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Mate in 3: pawn to a5 (b4)

Shuffle Rating 1980Theme: 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.

Mate in 3: a forced sequence that ends in checkmate.

Difficulty 1980 ShuffleRating — for advanced tacticians.

White to move — find the best continuation

Position on the board

White: king g2, queen a3, rook h1, bishop a2, pawn f2 g3 b4 c4 b5 c6 h6 d7.

Black: king d8, rook f8, pawn a5 g5 f6 h7.

12 white and 6 black pieces are on the board; the puzzle position arises after move 35.

Solution & explanation

Main line

35. bxa5 Rg8 36. Qd6 Rh8 37. c7#

Why it works

  • Best move. pawn to a5 is exactly what the engine plays (#2).
  • queen to d6 develops smoothly.
  • Precise: pawn to c7 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Rg8, then Qd6 and you stay on top.

Types in this puzzle

Pawn mate

The humblest soldier delivers the final blow.

The pawn mate lets the humblest soldier land the final blow. It happens to a king stuck among its own and enemy pieces: the pawn strikes diagonally from one square away and there is nowhere left to run. The sign: the squares around the king are covered or occupied, and your pawn stands one step from striking distance. Never write pawns out of your attack — their blows are the cheapest and therefore the most humiliating.

Mate in 3

A forced checkmate in three moves.

Mate in three is a forced staircase: each of your moves narrows the opponent's choices, and the third one ends the game. Look for the start among checks and sacrifices — quiet first moves are rare in mating problems, but deliciously sneaky. Keep the tree in your head: every defense gets its own branch. Do not stop calculating after move two — see the final mating picture with your own eyes.

Discovered attack

A piece steps aside and opens a second attack from the piece behind it.

A discovered attack works like a curtain: one piece steps off the line and unveils the long-range piece behind it. The beauty is that the moving piece can create a second threat of its own — two attacks in one move. Look for your stacked pairs: a bishop or rook behind a knight or pawn, aimed through them at something valuable. Send the front piece to the most aggressive square — a discovery without a second threat wastes half its power.

About this position

These pieces come from starting position #480.

SP-480 · BastionGuard — King off-centre on c or f with both knights on inner files.

The king starts on f1, the rooks on d1 and h1, the queen on c1.

The queenside rook already stands on d1, so castling long moves only the king, from f1 to c1.

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

The pawn on f2 is defended by the king alone — the classic soft spot of the standard setup.

The setup belongs to the BastionGuard family; read right to left it becomes position 575.

The engine's main line opens with c4.

Morozov Balance Index: 69 of 100 — class B — balanced. Engine evaluation of the starting position: +21 centipawns for White (depth 48, 400 000 000 nodes).

Explore position #480

Provenance

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

Pack 014 · SP-480

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