Winning blow: bishop to b2 (e5·2)
c9-25922naming 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 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.
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 f2, bishop b3 e5, pawn h4.
Black: king h6, bishop e4, pawn b2 b4 f4 h5 f7.
4 white and 7 black pieces are on the board; the puzzle position arises after move 39.
The position in numbers
Black are ahead by 1 points of material (7 against 8; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on f2, the black king on h6.
It is White to move on move 39, with 22 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 1 pawns, Black 5. Files fully open (no pawns of either colour): a, c, d, e, g — natural highways for the rooks and queen. Half-open for White: b, f.
White hold the bishop pair, an edge in open lines. The White king has 4 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
39. Bxb2 Kg6 40. Bd4 Kf5 41. Bxf7 Bc2 42. Bxh5
Why it works
- Great move! bishop to b2 keeps the pressure (+2.7).
- bishop to d4 develops smoothly.
- Precise: bishop to f7 is the top choice (+3.1).
- Best move. bishop to h5 is exactly what the engine plays (+3.1).
- You win a piece — the pawn.
- If instead Kg6, then Bd4 and you stay on top.
Move by move
- 39. Bxb2 — bishop to b2 (capture)
- Kg6 — king to g6
- 40. Bd4 — bishop to d4
- Kf5 — king to f5
- 41. Bxf7 — bishop to f7 (capture)
- Bc2 — bishop to c2
- 42. Bxh5 — bishop to h5 (capture)
Types in this puzzle
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.
Only move
Everything else loses — find the only move that holds.
An only move is a position where everything loses except one single continuation. You cannot play "by hand" here: run through fundamentally different defenses — run away, block, trade, counterattack — and discard the ones that fail. The hallmark of these puzzles is that the obvious moves lose quickly while the solution often looks strange. First understand exactly what the threat is — then the one saving move reveals itself.
Minor-piece endgame
Bishops and knights duel — geometry decides.
A minor-piece endgame leaves only bishops and knights with pawns, and geometry decides. The bishop loves an open board and play on both wings; the knight loves fixed pawns and outpost squares. Check which color squares the pawns stand on and where the knight can actually reach in time. Practical tip: against a knight, spread the play across both flanks — short legs cannot cover everything.
About this position
These pieces come from starting position #107.
SP-107 · BastionGuard — Off-centre king (c/f), no knight on the a- or h-file.
The king starts on f1, the rooks on c1 and g1, the queen on a1.
Castling short simply swaps the two pieces: the king on f1 and the rook on g1 trade places.
A bishop starts in the corner on h1: it has a single diagonal, which the g-pawn unlocks, running out to a8.
One second-rank pawn starts with no defender at all: h2.
The setup belongs to the BastionGuard family; read right to left it becomes position 849.
The engine's main line opens with d4, putting a pawn straight into the centre.
Morozov Balance Index: 34 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +31 centipawns for White (depth 46, 400 000 000 nodes).
Explore position #107Provenance
Mined from the project's engine self-play games.
Pack 008 · SP-107
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