Winning blow: rook to b7 (b1·6)
c9-16638naming 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 1060 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 g1, rook b1 f2, bishop d1, knight e4, pawn g2 h2.
Black: king e7, rook h8, bishop c4, knight e3, pawn a3 e5 e6 a7 f7 g7 h7.
7 white and 11 black pieces are on the board; the puzzle position arises after move 26.
The position in numbers
Material is level — 18 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g1, the black king on e7.
It is White to move on move 26, with 39 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 2 pawns, Black 7. Files fully open (no pawns of either colour): b, c, d — natural highways for the rooks and queen. Half-open for White: a, e, f.
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
26. Rb7+ Kf8 27. Rfxf7+ Kg8 28. Rxg7+
Why it works
- Great move! rook to b7 keeps the pressure (#4).
- Spot on — rook to f7 (#3).
- Precise: rook to g7 is the top choice (#2).
- You win decisive material (+15.0).
- If instead Kf8, then Rfxf7+ and you stay on top.
Move by move
- 26. Rb7+ — rook to b7 with check
- Kf8 — king to f8
- 27. Rfxf7+ — rook to f7 (capture) with check
- Kg8 — king to g8
- 28. Rxg7+ — rook to g7 (capture) with check
Types in this puzzle
Skewer
A line attack forces the valuable piece to move, exposing the one behind it.
A skewer is a pin turned inside out: the valuable piece stands in front and something cheaper hides behind it. The big piece must step aside, and you collect the one that was sheltering in its shadow. Scan for the enemy king or queen sharing a file, rank or diagonal with another enemy piece. The deadliest version comes with check — the king moves, the rook behind it dies.
Win the pinned piece
The pinned piece cannot run — attack it again and win it.
A pinned piece cannot flee, which means you can win it outright by attacking it one more time. Count attackers against defenders: if you outnumber them, the piece is yours. The best extra attacker is a pawn, since it costs less than anything it might capture. Do not rush the capture — build up the pressure first, then harvest.
Check chase
Every move is a check — the king is chased into losing ground.
In a check chase every one of your moves is a check, so the opponent never gets a free second. The king is herded across the board until it loses a piece or walks into a decisive blow. Such lines are the easiest to calculate: each check allows only a handful of replies, so try them all. Make it a habit to start calculating any sharp position with the checks — they are the most forcing moves on the board.
About this position
These pieces come from starting position #217.
SP-217 · BastionScout — A c- or f-file king with at least one knight out on the edge.
The king starts on f1, the rooks on c1 and h1, the queen on b1.
Castling ends where it always does: king to g1 and rook to f1 on the short side, king to c1 and rook to d1 on the long one.
The bishops stand on d1 and e1; their long diagonals reach h5 and a5 once the e- and d-pawns step aside.
The pawn on g2 is defended by the king alone — the same soft spot f2 is in the classical setup.
The setup belongs to the BastionScout family; read right to left it becomes position 649.
The engine's main line opens with b4.
Morozov Balance Index: 100 of 100 — class A — most balanced. Engine evaluation of the starting position: +3 centipawns for White (depth 47, 400 000 000 nodes).
In 50 self-play games White scored 50.0% (95% CI 36.6–63.4%).
Explore position #217Provenance
Mined from the project's engine self-play games.
Pack 006 · SP-217
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