Winning blow: rook to f3 (b3)
c9-27641naming 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 d1, queen h7, rook b3, bishop a1, knight e1 e2, pawn a2 c2 d2 h4 g5 g6.
Black: king c7, queen f1, rook a8, bishop h8, knight c4 e4, pawn b5 e5 b6 a7 d7 e7.
12 white and 12 black pieces are on the board; the puzzle position arises after move 18.
The position in numbers
Material is level — 29 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on d1, the black king on c7.
It is White to move on move 18, with 36 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): f — natural highways for the rooks and queen. Half-open for White: b, e.
The White king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
18. Rf3 Qh1 19. d3 Ned2 20. Rg3 Rf8 21. dxc4
Why it works
- Great move! rook to f3 keeps the pressure (+2.7).
- pawn to d3 develops smoothly.
- A natural move: rook to g3.
- Best move. pawn to c4 is exactly what the engine plays (+3.1).
- You win a piece — the knight.
- If instead Qh1, then d3 and you stay on top.
Move by move
- 18. Rf3 — rook to f3
- Qh1 — queen to h1
- 19. d3 — pawn to d3
- Ned2 — knight to d2
- 20. Rg3 — rook to g3
- Rf8 — rook to f8
- 21. dxc4 — pawn to c4 (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 #563.
SP-563 · ThroneGuard — King home on d or e, knights kept off the a- and h-files — the family of the standard starting array.
The king starts on d1, the rooks on b1 and f1, the queen on g1.
The kingside rook already stands on f1, so castling short moves only the king, from d1 to g1.
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 d2 is defended by the king alone — the same soft spot f2 is in the classical setup.
The setup belongs to the ThroneGuard family; read right to left it becomes position 483.
The engine's main line opens with b3.
Morozov Balance Index: 80 of 100 — class A — most balanced. Engine evaluation of the starting position: +17 centipawns for White (depth 47, 400 000 000 nodes).
Explore position #563Provenance
Mined from the project's engine self-play games.
Pack 010 · SP-563
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