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Mate in 3: queen to g7 (g4)

Shuffle Rating 1990Theme: 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.

A fork made possible by the Chess960 piece placement.

Difficulty 1990 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.

A set-up fork needs one preparing move before the fork lands — a check that drives the king onto the forking square, or a capture that lines the targets up. Find the preparation first, then the fork it makes possible.

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 f1, queen g4, rook c1, bishop b1 f6, pawn a2 e2 f2 g2 c4 d5.

Black: king f8, rook c8, bishop a6 b8, knight g8, pawn b4 e4 a5 b6 d6.

11 white and 10 black pieces are on the board; the puzzle position arises after move 26.

The position in numbers

White are ahead by 7 points of material (26 against 19; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on f1, the black king on f8.

It is White to move on move 26, with 43 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 6 pawns, Black 5. Files fully open (no pawns of either colour): h — natural highways for the rooks and queen. Half-open for White: b.

The White king has 3 empty squares to step to right now — the fewer they are, the closer a mating net.

Solution & explanation

Main line

26. Qg7+ Ke8 27. Qxg8+ Kd7 28. Qf7#

Why it works

  • Great move! queen to g7 keeps the pressure (#2).
  • Spot on — queen to g8 (#1).
  • Precise: queen to f7 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Ke8, then Qxg8+ and you win the knight.

Move by move

  • 26. Qg7+ — queen to g7 with check
  • Ke8 — king to e8
  • 27. Qxg8+ — queen to g8 (capture) with check
  • Kd7 — king to d7
  • 28. Qf7# — queen to f7 and it is checkmate

Types in this puzzle

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.

Setup fork

The random setup allows a fork that classical chess never sees.

A setup fork is a double attack that exists only because of the unusual starting squares — in classical chess these targets never stand side by side. Look for pairs of undefended pieces on your opponent's back rank and for squares from which a knight or pawn hits both at once. Such forks usually appear within the first moves, before the pieces disperse. In every new position, note right away which starting pieces are defended by no one.

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 #512.

SP-512 · BastionGuard — A c- or f-file king and two knights on inner files (b–g).

The king starts on f1, the rooks on c1 and h1, 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 a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.

The pawn on g2 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 543.

The engine's main line opens with c4.

Morozov Balance Index: 83 of 100 — class A — most balanced. Engine evaluation of the starting position: +16 centipawns for White (depth 45, 400 000 000 nodes).

Explore position #512

Provenance

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

Pack 014 · SP-512

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