Winning blow: rook to e1 (b1)
c9-16580naming 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.
Winning tactic: there is a move that gains a decisive advantage — find it.
Difficulty 1390 ShuffleRating — club-player level.
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.
This position hides a concrete tactic that wins material or mates. Start with the most forcing candidate moves — checks, captures and threats — and calculate each to a clear end before choosing; the winning line is usually the one the opponent cannot meet.
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 h1, queen f6, rook b1 f5, bishop f1, knight f3, pawn g2 a4 e4 a5 h5.
Black: king e8, queen e3, rook b8, bishop d5 d6, knight f7, pawn c2 b3 h6 c7.
11 white and 10 black pieces are on the board; the puzzle position arises after move 27.
The position in numbers
White are ahead by 3 points of material (30 against 27; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on h1, the black king on e8.
It is White to move on move 27, with 44 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 4. Files fully open (no pawns of either colour): d, f — natural highways for the rooks and queen. Half-open for White: b, c.
Black hold the bishop pair, an edge in open lines. The White king has 0 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
27. Re1 Qxe1 28. Nxe1 c1=Q 29. Nd3 Qe3 30. exd5
Why it works
- Great move! rook to e1 keeps the pressure (+1.5).
- Well found: knight to e1 (+1.6).
- A natural move: knight to d3.
- Best move. pawn to d5 is exactly what the engine plays (+1.5).
- You reach a winning position (+1.5).
- If instead Qxe1, then Nxe1 and you win the queen.
Move by move
- 27. Re1 — rook to e1
- Qxe1 — queen to e1 (capture)
- 28. Nxe1 — knight to e1 (capture)
- c1=Q — pawn to c1
- 29. Nd3 — knight to d3
- Qe3 — queen to e3
- 30. exd5 — pawn to d5 (capture)
Types in this puzzle
Quiet move
No check, no capture — yet this modest move decides the game.
A quiet move gives no check and takes nothing — yet it decides the game by creating an unstoppable threat or stealing the king's last square. This is the hardest class of moves: the eye hunts for loud blows while a modest shift does the winning. The clue: every forcing try runs into a defense, so seek the move that strengthens the threat or takes squares away. Train yourself to ask: what if I neither capture nor check, but quietly improve?
About this position
These pieces come from starting position #390.
SP-390 · RampartGuard — King on the wing (b/g) with both knights on inner files.
The king starts on g1, the rooks on b1 and h1, the queen on a1.
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 f1; their long diagonals reach h6 and a6 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 RampartGuard family; read right to left it becomes position 758.
The engine's main line opens with h4.
Morozov Balance Index: 34 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +31 centipawns for White (depth 45, 400 000 000 nodes).
Explore position #390Provenance
Mined from the project's engine self-play games.
Pack 010 · SP-390
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