Winning blow: rook to f7 (f6)
c9-25756naming 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.
A fork made possible by the Chess960 piece placement.
Winning tactic: there is a move that gains a decisive advantage — find it.
Difficulty 1200 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.
A set-up fork needs one preparing move before the fork lands — a check that drives the king onto the forking square, or a capture that lines the targets up. Find the preparation first, then the fork it makes possible.
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 c1, queen f3, rook f6, knight b2 c3, pawn c2 d2 a4 c5 e5 h5.
Black: king b7, queen a3, rook d8, bishop f5, knight e8, pawn a5 b6 c6 e6 f7 h7.
11 white and 11 black pieces are on the board; the puzzle position arises after move 33.
The position in numbers
Material is level — 26 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on c1, the black king on b7.
It is White to move on move 33, with 34 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): g — natural highways for the rooks and queen. Half-open for White: b, 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
33. Rxf7+ Nc7 34. Rxc7+ Kxc7 35. Nb5+ cxb5 36. Qxa3
Why it works
- Great move! rook to f7 keeps the pressure (+5.9).
- Well found: rook to c7 (+6.3).
- Precise: knight to b5 is the top choice (+6.4).
- Best move. queen to a3 is exactly what the engine plays (+6.6).
- You win a piece — the queen.
- If instead Nc7, then Rxc7+ and you win the knight.
Move by move
- 33. Rxf7+ — rook to f7 (capture) with check
- Nc7 — knight to c7
- 34. Rxc7+ — rook to c7 (capture) with check
- Kxc7 — king to c7 (capture)
- 35. Nb5+ — knight to b5 with check
- cxb5 — pawn to b5 (capture)
- 36. Qxa3 — queen to a3 (capture)
Types in this puzzle
Setup fork
The random setup allows a fork that classical chess never sees.
A setup fork is a double attack that exists only because of the unusual starting squares — in classical chess these targets never stand side by side. Look for pairs of undefended pieces on your opponent's back rank and for squares from which a knight or pawn hits both at once. Such forks usually appear within the first moves, before the pieces disperse. In every new position, note right away which starting pieces are defended by no one.
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.
Discovered attack
A piece steps aside and opens a second attack from the piece behind it.
A discovered attack works like a curtain: one piece steps off the line and unveils the long-range piece behind it. The beauty is that the moving piece can create a second threat of its own — two attacks in one move. Look for your stacked pairs: a bishop or rook behind a knight or pawn, aimed through them at something valuable. Send the front piece to the most aggressive square — a discovery without a second threat wastes half its power.
About this position
These pieces come from starting position #739.
SP-739 · BastionGuard — The king starts one file off-centre, on c or f, with neither knight in a corner.
The king starts on c1, the rooks on b1 and g1, the queen on f1.
The king already stands on c1, so castling long moves only the rook, from b1 to d1.
A bishop starts in the corner on a1: it has a single diagonal, which the b-pawn unlocks, running out to h8.
The second rank carries 2 pawns with no defender at all: a2, h2.
The setup belongs to the BastionGuard family; read right to left it becomes position 403.
The engine's main line opens with b4.
Morozov Balance Index: 99 of 100 — class A — most balanced. Engine evaluation of the starting position: +4 centipawns for White (depth 47, 400 000 000 nodes).
Explore position #739Provenance
Mined from the project's engine self-play games.
Pack 008 · SP-739
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