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Mate in 3: knight to h6 (g4·4)

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 d2, rook f1, bishop a1 h1, knight f4 g4, pawn a2 h2 f3 g3 d4 e5.

Black: king g8, queen b4, rook f8, bishop a8 h8, knight a4 c6, pawn c4 e6 g6 c7 d7 h7.

13 white and 13 black pieces are on the board; the puzzle position arises after move 17.

The position in numbers

Material is level — 32 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).

The white king stands on g1, the black king on g8.

It is White to move on move 17, with 38 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

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

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

17. Nh6+ Kg7 18. Nh5+ gxh5 19. Qg5#

Why it works

  • Great move! knight to h6 keeps the pressure (#2).
  • Well found: knight to h5 (#1).
  • Strong! queen to g5 is the sharp choice (#).
  • The line ends in a forced mate in 3.
  • If instead Kg7, then Nh5+ and you stay on top.

Move by move

  • 17. Nh6+ — knight to h6 with check
  • Kg7 — king to g7
  • 18. Nh5+ — knight to h5 with check
  • gxh5 — pawn to h5 (capture)
  • 19. Qg5# — queen to g5 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 #435.

SP-435 · 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 b1 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.

The second rank carries 2 pawns with no defender at all: c2, h2.

The setup belongs to the BastionGuard family; read right to left it becomes position 707.

The engine's main line opens with b3.

Morozov Balance Index: 51 of 100 — class B — balanced. Engine evaluation of the starting position: +26 centipawns for White (depth 44, 400 000 000 nodes).

Explore position #435

Provenance

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

Pack 013 · SP-435

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