Mate in 3: rook to a1 (e1)
c9-24422naming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
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 b2, rook e1, knight h1 b6, pawn c2 g3 h4 c5.
Black: king a7, queen a8, knight g6, pawn b4 d4 f5 h5 c6 b7 g7.
8 white and 10 black pieces are on the board; the puzzle position arises after move 34.
The position in numbers
Black are ahead by 4 points of material (15 against 19; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on b2, the black king on a7.
It is White to move on move 34, with 28 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 7. Files fully open (no pawns of either colour): a, e — natural highways for the rooks and queen. Half-open for White: b, d, f.
The White king has 5 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
34. Ra1+ Kb8 35. Rxa8+ Kc7 36. Rc8#
Why it works
- Great move! rook to a1 keeps the pressure (#2).
- Well found: rook to a8 (#1).
- Precise: rook to c8 is the top choice (#).
- The line ends in a forced mate in 3.
- If instead Kb8, then Rxa8+ and you win the queen.
Move by move
- 34. Ra1+ — rook to a1 with check
- Kb8 — king to b8
- 35. Rxa8+ — rook to a8 (capture) with check
- Kc7 — king to c7
- 36. Rc8# — rook to c8 and it is checkmate
Types in this puzzle
Hook mate
Rook, knight and pawn form a hook the king cannot escape.
The hook mate is a three-piece construction: the rook mates, the knight guards the rook, and a pawn guards the knight. The rook strikes the king at close range along a line, the knight stands diagonally nearby stealing the escape squares, and the pawn anchors the chain. The pattern usually appears near the edge after a rook invasion. Build it link by link — first plant the knight under pawn protection, then crash in with the rook.
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.
Queen endgame
Queens on an open board — precision above all.
Queen endgames are treacherous: the queen reaches everywhere, and one slip turns a win into perpetual check. The signs are few pawns, exposed kings, and checks hanging in the air. Tuck your king away early, and use your own checks to bring the queen closer or push your passer with tempo. The typical mistake is grabbing pawns while leaving your king exposed to endless checks.
About this position
These pieces come from starting position #814.
SP-814 · RampartScout — A knight in the corner and the king out on the wing (b/g); like every family, it is closed under mirror twins.
The king starts on b1, the rooks on a1 and e1, the queen on c1.
From b1 the king makes the longest journey Chess960 allows when castling short: five squares to g1.
The bishops stand on f1 and g1; their long diagonals reach a6 and a7 once the e- and f-pawns step aside.
Every pawn on the second rank is defended from the very first move.
The setup belongs to the RampartScout family; read right to left it becomes position 148.
The engine's main line opens with d4, putting a pawn straight into the centre.
Morozov Balance Index: 27 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +32 centipawns for White (depth 46, 400 000 000 nodes).
In 50 self-play games White scored 55.0% (95% CI 41.3–67.9%).
Explore position #814Provenance
Mined from the project's engine self-play games.
Pack 012 · SP-814
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