Castling-960 to the rescue on h1 (g1·14)
c9-26016naming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Castling 960: the strongest move is to castle — drag the king onto its rook.
Chess960 twist: use the unusual starting setup of the pieces.
Winning tactic: there is a move that gains a decisive advantage — find it.
Difficulty 1760 ShuffleRating — for advanced tacticians.
White to move — find the best continuation
How to recognize this tactic
Chess960 castling still ends with king and rook on the classical squares (g1/f1 or c1/d1), but the path can be unusual. Watch which squares the king crosses and whether castling here opens a file, drops a defender or walks into a 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 g1, queen b1, rook h1 f2, bishop c2 g5, knight e7, pawn a2 b2 g2 h4.
Black: king g7, queen e6, rook g4 h8, bishop c8, knight b6 f8, pawn h5 c6 g6 a7 b7 d7 f7.
11 white and 14 black pieces are on the board; the puzzle position arises after move 17.
The position in numbers
Black are ahead by 3 points of material (32 against 35; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on g7.
It is White to move on move 17, with 42 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): e — natural highways for the rooks and queen. Half-open for White: c, d, f.
White hold the bishop pair, an edge in open lines. 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
17. O-O d5 18. Rxf7+ Qxf7 19. Rxf7+ Kxf7 20. Qf1+
Why it works
- Great move! king to g1 keeps the pressure (+4.7).
- Well found: rook to f7 (+7.6).
- Strong! rook to f7 is the sharp choice (+7.9).
- Best move. queen to f1 is exactly what the engine plays (+6.2).
- You win decisive material (+6.2).
- If instead d5, then Rxf7+ and you stay on top.
Move by move
- 17. O-O — king to h1
- d5 — pawn to d5
- 18. Rxf7+ — rook to f7 (capture) with check
- Qxf7 — queen to f7 (capture)
- 19. Rxf7+ — rook to f7 (capture) with check
- Kxf7 — king to f7 (capture)
- 20. Qf1+ — queen to f1 with check
Types in this puzzle
Castling to safety
One move — castling — whisks the king out of mortal danger.
Castling to safety: the only escape from the attack is to castle — one move whisks the king to g1 or c1 and brings the rook into play as a bonus. In Chess960 this leap can cross half the board, which is exactly why it slips out of sight. Whenever your king is under pressure, ask first: can I still castle? The typical blunder is throwing that right away with a careless king or rook move.
Decoy
A sacrifice lures the king or a piece onto a fatal square.
A decoy is the mirror image of deflection: you sacrifice to drag the king or a piece onto a fatal square. The classic is a queen or rook sac whose capture pulls the king into a knight fork, a discovered check or mate. Find the square where the target will be hit, then find the offer it cannot refuse. Calculate to the very end — a decoy only works when the follow-up is forced.
960 castling G-side
Chess960 castling to the G-side — king and rook leap to g1 and f1 from unusual squares.
Castling in Chess960 looks unusual: wherever the king and rook start, G-side castling lands them on the classical destination squares — king to g1, rook to f1. Sometimes the king travels half the board; sometimes it "castles in place." The conditions are the familiar ones: neither piece has moved, the path is clear, and the king never crosses an attacked square. In the app the gesture is simple — drag your king onto the rook.
About this position
These pieces come from starting position #117.
SP-117 · 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 e1 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.
The pawn on f2, g2 is defended by the king alone — the same soft spot f2 is in the classical setup.
The setup belongs to the RampartScout family; read right to left it becomes position 842.
The engine's main line opens with d4, putting a pawn straight into the centre.
Morozov Balance Index: 72 of 100 — class B — balanced. Engine evaluation of the starting position: +20 centipawns for White (depth 46, 400 000 000 nodes).
Explore position #117Provenance
Mined from the project's engine self-play games.
Pack 013 · SP-117
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