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Mate in 3: queen to d6 (f6·2)

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 g1, queen f6, rook c1 f1, bishop d1 d4, pawn e2 g2 h2 c3 f4.

Black: king e4, queen b2, bishop g8, knight b4, pawn c4 g4 h5 b6 d6 d7.

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

The position in numbers

White are ahead by 9 points of material (30 against 21; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on g1, the black king on e4.

It is White to move on move 30, with 36 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): a — natural highways for the rooks and queen. Half-open for White: b, d.

White 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

30. Qxd6 Nd3 31. Qg6+ Kd5 32. e4#

Why it works

  • Best move. queen to d6 is exactly what the engine plays (#2).
  • Spot on — queen to g6 (#1).
  • Strong! pawn to e4 is the sharp choice (#).
  • The line ends in a forced mate in 3.
  • If instead Nd3, then Qg6+ and you stay on top.

Move by move

  • 30. Qxd6 — queen to d6 (capture)
  • Nd3 — knight to d3
  • 31. Qg6+ — queen to g6 with check
  • Kd5 — king to d5
  • 32. e4# — pawn to e4 and it is checkmate

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.

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 #77.

SP-77 · ThroneScout — King in the middle of the rank, with a knight already committed to the corner.

The king starts on e1, the rooks on c1 and h1, the queen on f1.

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.

The bishops stand on d1 and g1; their long diagonals reach h5 and a7 once the e- and f-pawns step aside.

The second rank carries 2 pawns with no defender at all: a2, b2.

The setup belongs to the ThroneScout family; read right to left it becomes position 888.

The engine's main line opens with f4.

Morozov Balance Index: 34 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +31 centipawns for White (depth 48, 400 000 000 nodes).

Explore position #77

Provenance

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

Pack 013 · SP-77

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