Attack on the uncastled king: knight to g7 (h5·6)
c9-17617naming 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.
Uncastled king: the enemy king is stuck in the centre — punish it before it castles.
Winning tactic: there is a move that gains a decisive advantage — find it.
Difficulty 920 ShuffleRating — for beginners taking their first steps in Chess960 tactics.
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.
An uncastled king in the centre is a standing target. Look for ways to open the central files and diagonals against it with checks and threats before it can shelter — every tempo the king spends in the middle is a chance for a combination.
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 f1, queen c1, rook b1 g1, bishop e1 c2, knight a1 h5, pawn a2 b2 e2 g2 h2 c4.
Black: king f8, queen c8, rook g7 b8, bishop d8 e8, knight a8 h8, pawn d4 b5 f6 a7 d7 e7 h7.
14 white and 15 black pieces are on the board; the puzzle position arises after move 8.
The position in numbers
Black are ahead by 1 points of material (37 against 38; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on f1, the black king on f8.
It is White to move on move 8, with 41 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 7. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: d, f.
The White king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
8. Nxg7 Kxg7 9. cxb5
Why it works
- Brilliant! The knight on g7 is a sacrifice that works — you stand better (+1.7).
- Spot on — pawn to b5 (+1.7).
- You win a piece — the rook.
- If instead Kxg7, then cxb5 and you win the rook.
Move by move
- 8. Nxg7 — knight to g7 (capture)
- Kxg7 — king to g7 (capture)
- 9. cxb5 — pawn to b5 (capture)
Types in this puzzle
SP weak spot
Every setup has its f7 — find this position's weak spot.
Every starting position has its own "f7" — a square next to the king that only the king itself defends. In Chess960 this weak spot is different every game: find the pawns around the enemy king and check who actually guards them. If the answer is "only the king," aim a bishop, knight or queen at that point. The mistake is watching f7 out of habit when the enemy king sits on b8 and its weakness lies somewhere else entirely.
Winning blow
Find the strike that wins material by force.
A winning blow is a forced material gain that does not fit a single textbook motif. The general tactical recipe applies: spot loose pieces, an awkwardly placed king, overloaded lines. Go through the forcing moves in order of violence — checks, captures, threats — because most combinations start with one of them. Do not judge by feel: calculate the concrete line until the outcome is beyond doubt.
Uncastled king
The king lingered in the middle — punish the delay.
Punishing the uncastled king: your opponent delayed castling, and now his king is stuck on its starting square under fire. In Chess960 this is deadlier than in classical chess — the king may start in the center or near the edge, and the familiar defensive setups simply do not apply. The signs: the victim still holds castling rights, and the files toward his king are half-open. Open lines before the king manages to hide.
About this position
These pieces come from starting position #329.
SP-329 · BastionScout — King shifted to c or f, with a knight committed to the corner from move one.
The king starts on f1, the rooks on b1 and g1, the queen on c1.
Castling short simply swaps the two pieces: the king on f1 and the rook on g1 trade places.
The bishops stand on d1 and e1; their long diagonals reach h5 and a5 once the e- and d-pawns step aside.
The second rank carries 2 pawns with no defender at all: a2, h2.
The setup belongs to the BastionScout family; read right to left it becomes position 345.
The engine's main line opens with e4, putting a pawn straight into the centre.
Morozov Balance Index: 75 of 100 — class A — most balanced. Engine evaluation of the starting position: +19 centipawns for White (depth 44, 400 000 000 nodes).
Explore position #329Provenance
Mined from the project's engine self-play games.
Pack 004 · SP-329
Similar puzzles
In your browser or in the Android app. Nothing to install · Free, no ads