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Mate in 3: queen to d8 (e8·2)

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 b1, queen e8, rook a1 e1, knight b3 f6, pawn b2 d3 g3 c4 a5.

Black: king b8, queen h6, rook a8, bishop g4, knight b5 d8, pawn b6 c6 a7.

11 white and 9 black pieces are on the board; the puzzle position arises after move 37.

The position in numbers

White are ahead by 4 points of material (30 against 26; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on b1, the black king on b8.

It is White to move on move 37, with 47 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 5 pawns, Black 3. Files fully open (no pawns of either colour): e, f, h — natural highways for the rooks and queen.

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

37. Qxd8+ Bc8 38. Nd7+ Kb7 39. a6#

Why it works

  • Great move! queen to d8 keeps the pressure (#2).
  • Spot on — knight to d7 (#1).
  • Precise: pawn to a6 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Bc8, then Nd7+ and you win the knight.

Move by move

  • 37. Qxd8+ — queen to d8 (capture) with check
  • Bc8 — bishop to c8
  • 38. Nd7+ — knight to d7 with check
  • Kb7 — king to b7
  • 39. a6# — pawn to a6 and it is checkmate

Types in this puzzle

Pawn mate

The humblest soldier delivers the final blow.

The pawn mate lets the humblest soldier land the final blow. It happens to a king stuck among its own and enemy pieces: the pawn strikes diagonally from one square away and there is nowhere left to run. The sign: the squares around the king are covered or occupied, and your pawn stands one step from striking distance. Never write pawns out of your attack — their blows are the cheapest and therefore the most humiliating.

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 #362.

SP-362 · BastionScout — The king starts one file off-centre, on c or f, and a knight begins in a corner.

The king starts on c1, the rooks on b1 and d1, the queen on g1.

The king already stands on c1, so castling long moves only the rook, from b1 to d1.

The bishops stand on e1 and f1; their long diagonals reach a5 and a6 once the d- and e-pawns step aside.

One second-rank pawn starts with no defender at all: a2.

The setup belongs to the BastionScout family; read right to left it becomes position 309.

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

Morozov Balance Index: 21 of 100 — class D — largest edge. Engine evaluation of the starting position: +36 centipawns for White (depth 43, 400 000 000 nodes).

Explore position #362

Provenance

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

Pack 013 · SP-362

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