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Mate in 3: queen to c8 (c7·3)

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 d1, queen c7, rook c1 g1, bishop h1, knight a1, pawn a2 e2 h2 b3 d3 g4 d5.

Black: king e8, queen f2, rook g8, bishop c8 h8, pawn e5 f5 b6 d6 g6 b7 h7.

13 white and 12 black pieces are on the board; the puzzle position arises after move 15.

The position in numbers

White are ahead by 5 points of material (32 against 27; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on d1, the black king on e8.

It is White to move on move 15, with 42 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 7 pawns, Black 7. Files fully open (no pawns of either colour): c — natural highways for the rooks and queen. Half-open for White: f.

Black hold the bishop pair, an edge in open lines. The White king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.

Solution & explanation

Main line

15. Qxc8+ Ke7 16. Qxb7+ Kf8 17. Rc8#

Why it works

  • Great move! queen to c8 keeps the pressure (#2).
  • Spot on — queen to b7 (#1).
  • Precise: rook to c8 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Ke7, then Qxb7+ and you win the bishop.

Move by move

  • 15. Qxc8+ — queen to c8 (capture) with check
  • Ke7 — king to e7
  • 16. Qxb7+ — queen to b7 (capture) with check
  • Kf8 — king to f8
  • 17. Rc8# — rook to c8 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 #247.

SP-247 · ThroneScout — A central king (d or e), but with a knight posted out on the a- or h-file.

The king starts on d1, the rooks on b1 and g1, the queen on e1.

Castling ends where it always does: king to g1 and rook to f1 on the short side, king to c1 and rook to d1 on the long one.

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

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

The setup belongs to the ThroneScout family; read right to left it becomes position 610.

The engine's main line opens with g3.

Morozov Balance Index: 78 of 100 — class A — most balanced. Engine evaluation of the starting position: +18 centipawns for White (depth 49, 400 000 000 nodes).

Explore position #247

Provenance

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

Pack 013 · SP-247

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