♚Open in the app

Mate in 3: rook to b6 (a6)

Shuffle Rating 1980Theme: Chess960 twist: use the unusual starting setup of the pieces.
White to move — find the best continuation

Solve in the app

The tactical motive

Chess960 twist: use the unusual starting setup of the pieces.

Mate in 3: a forced sequence that ends in checkmate.

Difficulty 1980 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 b5, queen c8, rook g5 a6, pawn e3 b4 c5.

Black: king e7, rook h7, knight b6, pawn e4 d7.

7 white and 5 black pieces are on the board; the puzzle position arises after move 36.

The position in numbers

White are ahead by 12 points of material (22 against 10; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.

The white king stands on b5, the black king on e7.

It is White to move on move 36, with 34 legal replies to weigh — only the line that keeps the advantage solves the puzzle.

White keeps 3 pawns, Black 2. Files fully open (no pawns of either colour): a, f, g, h — natural highways for the rooks and queen. Half-open for White: d.

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

36. Rxb6 d5 37. Rb7+ Kf6 38. Qf5#

Why it works

  • Best move. rook to b6 is exactly what the engine plays (#2).
  • Spot on — rook to b7 (#1).
  • Precise: queen to f5 is the top choice (#).
  • The line ends in a forced mate in 3.
  • If instead d5, then Rb7+ and you win the knight.

Move by move

  • 36. Rxb6 — rook to b6 (capture)
  • d5 — pawn to d5
  • 37. Rb7+ — rook to b7 with check
  • Kf6 — king to f6
  • 38. Qf5# — queen to f5 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 #561.

SP-561 · ThroneGuard — Both knights start on inner files (b–g) while the king sits centrally on d or e — one of 204 positions filed here.

The king starts on e1, the rooks on b1 and g1, the queen on h1.

Castling ends where it always does: king to g1 and rook to f1 on the short side, king to c1 and rook to d1 on the long one.

A bishop starts in the corner on a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.

The pawn on f2 is defended by the king alone — the classic soft spot of the standard setup.

The setup belongs to the ThroneGuard family; read right to left it becomes position 491.

The engine's main line opens with Nd3, bringing the knight out to d3.

Morozov Balance Index: 55 of 100 — class B — balanced. Engine evaluation of the starting position: +25 centipawns for White (depth 43, 400 000 000 nodes).

Explore position #561

Provenance

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

Pack 014 · SP-561

Similar puzzles

In your browser or in the Android app. Nothing to install · Free, no ads

Embed

Copy this code to embed the board on your site: