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Mate in 3: king to b1

c9-13255
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 c1, queen a6, rook g1 d5, bishop b6, pawn a2 b2 g2 g3 c5.

Black: king a8, queen b1, rook g5, knight e5, pawn h5 c6 e6 a7 d7.

10 white and 9 black pieces are on the board; the puzzle position arises after move 27.

The position in numbers

White are ahead by 5 points of material (27 against 22; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on c1, the black king on a8.

It is White to move on move 27, with 2 legal replies to weigh — only the line that keeps the advantage solves the puzzle. White are in check right now, so every reply must answer the check.

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

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

27. Kxb1 Kb8 28. Qxa7+ Kc8 29. Qc7#

Why it works

  • Great move! king to b1 keeps the pressure (#2).
  • Spot on — queen to a7 (#1).
  • Precise: queen to c7 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead Kb8, then Qxa7+ and you win the queen.

Move by move

  • 27. Kxb1 — king to b1 (capture)
  • Kb8 — king to b8
  • 28. Qxa7+ — queen to a7 (capture) with check
  • Kc8 — king to c8
  • 29. Qc7# — queen to c7 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 #345.

SP-345 · BastionScout — Off-centre king plus a rim knight (a/h): 168 positions carry this shape.

The king starts on c1, the rooks on b1 and g1, the queen on f1.

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

The bishops stand on d1 and e1; their long diagonals reach h5 and a5 once the e- and d-pawns step aside.

The second rank carries 2 pawns with no defender at all: a2, h2.

The setup belongs to the BastionScout family; read right to left it becomes position 329.

The engine's main line opens with g4.

Morozov Balance Index: 47 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +27 centipawns for White (depth 47, 400 000 000 nodes).

Explore position #345

Provenance

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

Pack 012 · SP-345

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