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Mate in 3: queen to h8 (h7·3)

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.

A fork made possible by the Chess960 piece placement.

Difficulty 1630 ShuffleRating — for advanced tacticians.

White to move — find the best continuation

Position on the board

White: king g1, queen h7, rook a1 f1, bishop e1 d5, knight e5, pawn a2 b2 h2 c3 g3.

Black: king f8, queen c8, rook g7 d8, bishop f6, knight d6 e8, pawn d4 g5 h5 a7 b7 e7 f7.

12 white and 14 black pieces are on the board; the puzzle position arises after move 19.

Solution & explanation

Main line

19. Qh8+ Rg8 20. Ng6+ fxg6 21. Qxg8#

Why it works

  • Great move! queen to h8 keeps the pressure (#2).
  • Well found: knight to g6 (#1).
  • Strong! queen to g8 is the sharp choice (#).
  • The line ends in a forced mate in 3.
  • If instead Rg8, then Ng6+ and you stay on top.

Types in this puzzle

Supported queen mate

The queen delivers mate face to face, protected by a friend.

The supported queen mate is the most common pattern of all: the queen lands next to the king and mates because a friendly piece or pawn protects her. The king is helpless — capturing is impossible, and the queen covers every neighboring square herself. Hunt for a protected square beside the enemy king: a knight, bishop or pawn eyeing it turns her invasion into mate. Verify one thing — that the square really is defended, or the king eats her.

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.

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.

About this position

These pieces come from starting position #411.

SP-411 · BastionGuard — King shifted to c or f, knights kept clear of the edges — 168 positions in all.

The king starts on f1, the rooks on a1 and g1, the queen on b1.

Castling short simply swaps the two pieces: the king on f1 and the rook on g1 trade places.

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: h2.

The setup belongs to the BastionGuard family; read right to left it becomes position 737.

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

Morozov Balance Index: 31 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +32 centipawns for White (depth 45, 400 000 000 nodes).

Explore position #411

Provenance

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

Pack 012 · SP-411

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