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Chess960 tactic on c5 (c4)

Shuffle Rating 2400Theme: 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: a forcing sequence that ends the game — the king has no escape.

Mate in 4: a forced checkmate in four moves — every reply is covered.

Difficulty 2400 ShuffleRating — expert level — few solve it at first try.

White to move — find the best continuation

Position on the board

White: king b1, queen h6, rook d1 a3, bishop c2, knight b2, pawn c4 d4 e4 g4 f5.

Black: king b6, rook f2 c7, bishop g6, knight b4, pawn c6 d6 f6 b7 h7.

11 white and 10 black pieces are on the board; the puzzle position arises after move 32.

Solution & explanation

Main line

32. c5+ dxc5 33. Nc4+ Kb5 34. Ra5+ Kxc4 35. Rxc5#

Why it works

  • Great move! pawn to c5 keeps the pressure (#3).
  • Spot on — knight to c4 (#2).
  • Precise: rook to a5 is the top choice (#1).
  • Best move. rook to c5 is exactly what the engine plays (#).
  • The line ends in a forced mate in 4.
  • If instead dxc5, then Nc4+ and you stay on top.

Types in this puzzle

Ladder mate

Two heavy pieces climb line by line, cutting off every retreat.

The ladder mate uses two heavy pieces climbing rung by rung: one cuts the king off along a line, the other checks on the next line, driving him toward the edge. It is the classic two-rook technique — check, the king retreats one rank, the other rook checks, until mate on the last rank. The only danger is the king creeping close enough to attack one of your rooks. If it does, simply slide that rook to the far side of the same line.

Mate in 4+

A long forced mating combination.

Mate in four or longer is a marathon of forcing moves where the grip must never loosen. The tools are the same: checks, double threats and sacrifices that deny the opponent a single free tempo. Do not juggle the whole tree at once — walk the main line all the way to mate first, then verify the side branches. If somewhere the defender finds one quiet move that holds, your very first move was wrong.

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 #760.

SP-760 · BastionGuard — Both knights begin inside the board while the king stands on c or f; a position and its mirror twin share this family.

The king starts on c1, the rooks on a1 and g1, 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 b1 and e1; their long diagonals reach h7 and a5 once the c- and d-pawns step aside.

One second-rank pawn starts with no defender at all: e2.

The setup belongs to the BastionGuard family; read right to left it becomes position 397.

The engine's main line opens with d4, putting a pawn straight into the centre.

Morozov Balance Index: 2 of 100 — class D — largest edge. Engine evaluation of the starting position: +61 centipawns for White (depth 46, 400 000 000 nodes).

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

Explore position #760

Provenance

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

Pack 015 · SP-760

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