Mate in 3: rook to e8 (e1·10)
c9-26002naming 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 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 g2, queen d4, rook e1 h1, bishop h6, knight f3, pawn b2 f2 a3 g3 h4 d6.
Black: king g8, queen g4, rook d7, knight c5, pawn c4 f4 h5 c6 g6 a7 b7.
12 white and 11 black pieces are on the board; the puzzle position arises after move 30.
The position in numbers
White are ahead by 7 points of material (31 against 24; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g2, the black king on g8.
It is White to move on move 30, with 46 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 7. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for White: c.
The White king has 3 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
30. Re8+ Kf7 31. Rf8+ Ke6 32. Rf6#
Why it works
- Great move! rook to e8 keeps the pressure (#2).
- Spot on — rook to f8 (#1).
- Precise: rook to f6 is the top choice (#).
- The line ends in a forced mate in 3.
- If instead Kf7, then Rf8+ and you stay on top.
Move by move
- 30. Re8+ — rook to e8 with check
- Kf7 — king to f7
- 31. Rf8+ — rook to f8 with check
- Ke6 — king to e6
- 32. Rf6# — rook to f6 and it is checkmate
Types in this puzzle
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.
About this position
These pieces come from starting position #21.
SP-21 · RampartScout — Wing king plus a rim knight, and only 72 positions qualify — the rarest pattern of all.
The king starts on g1, the rooks on f1 and h1, the queen on b1.
The king already stands on its castled square, so castling short moves only the rook, from h1 to f1.
The bishops stand on c1 and d1; their long diagonals reach h6 and h5 once the d- and e-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 938.
The engine's main line opens with e4, putting a pawn straight into the centre.
Morozov Balance Index: 40 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +29 centipawns for White (depth 48, 400 000 000 nodes).
Explore position #21Provenance
Mined from the project's engine self-play games.
Pack 013 · SP-21
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