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Mate in 3: queen to c5 (f2·3)

Shuffle Rating 1760Theme: 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 1760 ShuffleRating — for advanced tacticians.

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.

In a mate in three every move must be forcing; the defender should never get a free tempo. Find the check or threat that herds the king, calculate the single defence to each, and confirm the net closes on the third move.

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 b2, queen f2, rook e1 d7, knight a2 g6, pawn c2 h2 g3 b4 g5.

Black: king c8, rook b8, pawn c4 e4 f4 a5 b5 h5.

11 white and 8 black pieces are on the board; the puzzle position arises after move 29.

The position in numbers

White are ahead by 19 points of material (30 against 11; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on b2, the black king on c8.

It is White to move on move 29, with 55 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): d — natural highways for the rooks and queen. Half-open for White: a, e, f.

The White king has 5 empty squares to step to right now — the fewer they are, the closer a mating net.

Solution & explanation

Main line

29. Qc5+ Kxd7 30. Rd1+ Ke8 31. Qe7#

Why it works

  • Best move. queen to c5 is exactly what the engine plays (#2).
  • Spot on — rook to d1 (#1).
  • Precise: queen to e7 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Kxd7, then Rd1+ and you stay on top.

Move by move

  • 29. Qc5+ — queen to c5 with check
  • Kxd7 — king to d7 (capture)
  • 30. Rd1+ — rook to d1 with check
  • Ke8 — king to e8
  • 31. Qe7# — queen to e7 and it is checkmate

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 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 #639.

SP-639 · 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 a1 and e1, the queen on d1.

The king already stands on c1, so castling long moves only the rook, from a1 to d1.

A bishop starts in the corner on h1: it has a single diagonal, which the g-pawn unlocks, running out to a8.

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 BastionGuard family; read right to left it becomes position 224.

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

Morozov Balance Index: 37 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +30 centipawns for White (depth 48, 400 000 000 nodes).

Explore position #639

Provenance

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

Pack 013 · SP-639

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