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Mate in 3: bishop to b5 (d3·2)

Shuffle Rating 1630Theme: 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 1630 ShuffleRating — for advanced tacticians.

White to move — find the best continuation

Position on the board

White: king f1, queen g8, rook e1, bishop b2 d3, knight f2, pawn h2 f3 f4 c5.

Black: king d7, queen a2, rook e7, pawn f5 h5 e6 a7.

10 white and 7 black pieces are on the board; the puzzle position arises after move 30.

Solution & explanation

Main line

30. Bb5+ Kc7 31. Be5+ Kb7 32. Qb8#

Why it works

  • Best move. bishop to b5 is exactly what the engine plays (#2).
  • Spot on — bishop to e5 (#1).
  • Precise: queen to b8 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Kc7, then Be5+ and you stay on top.

Types in this puzzle

Supported queen mate

The queen delivers mate face to face, protected by a friend.

The supported queen mate is the most common pattern of all: the queen lands next to the king and mates because a friendly piece or pawn protects her. The king is helpless — capturing is impossible, and the queen covers every neighboring square herself. Hunt for a protected square beside the enemy king: a knight, bishop or pawn eyeing it turns her invasion into mate. Verify one thing — that the square really is defended, or the king eats her.

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.

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 #292.

SP-292 · BastionScout — A knight on the a- or h-file, king on c or f — the mirror twin lands here as well.

The king starts on f1, the rooks on e1 and g1, the queen on a1.

Castling short simply swaps the two pieces: the king on f1 and the rook on g1 trade places.

The bishops stand on b1 and c1; their long diagonals reach h7 and h6 once the c- and d-pawns step aside.

One second-rank pawn starts with no defender at all: h2.

The setup belongs to the BastionScout family; read right to left it becomes position 382.

The engine's main line opens with c4.

Morozov Balance Index: 19 of 100 — class D — largest edge. Engine evaluation of the starting position: +49 centipawns for White (depth 45, 400 000 000 nodes).

In 50 self-play games White scored 51.0% (95% CI 37.6–64.3%).

Explore position #292

Provenance

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

Pack 012 · SP-292

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