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Mate in 3: queen to h4

c9-11839
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 g1, queen e1, rook f1 h3, bishop h7, knight f5, pawn a2 d2 g2 h2 b3 c4 g6.

Black: king f6, queen e6, rook c8 f8, bishop d5 b8, pawn c5 b6 a7 d7.

13 white and 10 black pieces are on the board; the puzzle position arises after move 21.

The position in numbers

White are ahead by 3 points of material (32 against 29; 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 f6.

It is White to move on move 21, with 43 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 7 pawns, Black 4. Files fully open (no pawns of either colour): e, f — natural highways for the rooks and queen.

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

21. Qh4+ Ke5 22. Re3+ Be4 23. Rxe4#

Why it works

  • Great move! queen to h4 keeps the pressure (#2).
  • Spot on — rook to e3 (#1).
  • Precise: rook to e4 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Ke5, then Re3+ and you stay on top.

Move by move

  • 21. Qh4+ — queen to h4 with check
  • Ke5 — king to e5
  • 22. Re3+ — rook to e3 with check
  • Be4 — bishop to e4
  • 23. Rxe4# — rook to e4 (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 #608.

SP-608 · BastionScout — The king starts one file off-centre, on c or f, and a knight begins in a corner.

The king starts on f1, the rooks on c1 and g1, the queen on e1.

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 a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.

One second-rank pawn starts with no defender at all: h2.

The setup belongs to the BastionScout family; read right to left it becomes position 255.

The engine's main line opens with c4.

Morozov Balance Index: 2 of 100 — class D — largest edge. Engine evaluation of the starting position: +53 centipawns for White (depth 45, 400 000 000 nodes).

Explore position #608

Provenance

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

Pack 012 · SP-608

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