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Mate in 3: queen to g4 (a4)

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

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 a4, rook c1 f8, bishop b1 e1, knight e2, pawn h2 b3 f3 c5.

Black: king e6, queen h6, rook c8, bishop d2, pawn a5 e7 f7 h7.

11 white and 8 black pieces are on the board; the puzzle position arises after move 21.

The position in numbers

White are ahead by 11 points of material (32 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 d1, the black king on e6.

It is White to move on move 21, with 46 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 4 pawns, Black 4. Files fully open (no pawns of either colour): d, g — natural highways for the rooks and queen. Half-open for White: a, e.

White hold the bishop pair, an edge in open lines. The White king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.

Solution & explanation

Main line

21. Qg4+ Kf6 22. Qf5+ Kg7 23. Qxf7#

Why it works

  • Best move. queen to g4 is exactly what the engine plays (#2).
  • Spot on — queen to f5 (#1).
  • Precise: queen to f7 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Kf6, then Qf5+ and you stay on top.

Move by move

  • 21. Qg4+ — queen to g4 with check
  • Kf6 — king to f6
  • 22. Qf5+ — queen to f5 with check
  • Kg7 — king to g7
  • 23. Qxf7# — queen to f7 (capture) 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 #872.

SP-872 · ThroneScout — The king starts on d or e while at least one knight begins in a corner.

The king starts on d1, the rooks on c1 and f1, the queen on a1.

Castling long simply swaps the two pieces: the king on d1 and the rook on c1 trade places.

The bishops stand on b1 and e1; their long diagonals reach h7 and a5 once the c- and d-pawns step aside.

The second rank carries 2 pawns with no defender at all: g2, h2.

The setup belongs to the ThroneScout family; read right to left it becomes position 93.

The engine's main line opens with c4.

Morozov Balance Index: 18 of 100 — class D — largest edge. Engine evaluation of the starting position: +38 centipawns for White (depth 42, 400 000 000 nodes).

Explore position #872

Provenance

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

Pack 012 · SP-872

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