Winning blow: rook to h3 (g3·6)
c9-27813naming 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 e5, rook g3, knight d3, pawn b2 f2 a4 d4.
Black: king g8, queen e8, rook c6, knight d5, pawn a5 g5 e6 g6 b7.
8 white and 9 black pieces are on the board; the puzzle position arises after move 26.
The position in numbers
Black are ahead by 1 points of material (21 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 h1, the black king on g8.
It is White to move on move 26, with 34 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 5. Files fully open (no pawns of either colour): c, h — natural highways for the rooks and queen. Half-open for White: e, g.
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
26. Rh3 Kf8 27. Rh8+ Ke7 28. Qxg5+ Nf6 29. Rxe8+
Why it works
- Best move. rook to h3 is exactly what the engine plays (+7.6).
- Well found: rook to h8 (+8.3).
- Precise: queen to g5 is the top choice (+8.8).
- Best move. rook to e8 is exactly what the engine plays (+9.1).
- You win a piece — the queen.
- If instead Kf8, then Rh8+ and you stay on top.
Move by move
- 26. Rh3 — rook to h3
- Kf8 — king to f8
- 27. Rh8+ — rook to h8 with check
- Ke7 — king to e7
- 28. Qxg5+ — queen to g5 (capture) with check
- Nf6 — knight to f6
- 29. Rxe8+ — rook to e8 (capture) with check
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 #422.
SP-422 · RampartGuard — A b- or g-file king and two knights on inner files (b–g).
The king starts on g1, the rooks on a1 and h1, the queen on d1.
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.
The pawn on f2 is defended by the king alone — the classic soft spot of the standard setup.
The setup belongs to the RampartGuard family; read right to left it becomes position 726.
The engine's main line opens with c4.
Morozov Balance Index: 83 of 100 — class A — most balanced. Engine evaluation of the starting position: +16 centipawns for White (depth 48, 400 000 000 nodes).
Explore position #422Provenance
Mined from the project's engine self-play games.
Pack 010 · SP-422
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