Fork: king to f3
li-0VtMxOpens in the app if installed, otherwise downloads the APK.
The tactical motive
Discovered attack: one piece steps aside, unleashing another's attack.
Fork: one piece attacks two targets at once — they can't both be saved.
Save the piece: one of your pieces is attacked — find the best way to rescue it.
Difficulty 2350 ShuffleRating — expert level — few solve it at first try.
Black to move — find the best continuation
How to recognize this tactic
A discovered attack fires when one piece steps aside and unmasks the piece behind it. Look for your own units that block a rook, bishop or queen: moving the front piece — ideally with a threat of its own — springs two attacks in one move.
A fork is one piece attacking two targets at once. Look for a knight, pawn or queen move that lands where it hits the king (or a bigger piece) and a second undefended unit on the same turn — the opponent can save only one.
Here the task is defensive: one of your pieces is under attack and must be rescued without losing more. Look for a move that saves it with tempo — a counter-check, an equal counter-attack or an interposition — rather than a passive retreat.
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 b4, rook e1, bishop d2, pawn b5.
Black: king e4, rook c2, bishop d4, pawn d3.
4 white and 4 black pieces are on the board; the puzzle position arises after move 47.
The position in numbers
Material is level — 9 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on b4, the black king on e4.
It is Black to move on move 47, with 4 legal replies to weigh — only the line that keeps the advantage solves the puzzle. Black are in check right now, so every reply must answer the check.
White keeps 1 pawns, Black 1. Files fully open (no pawns of either colour): a, c, e, f, g, h — natural highways for the rooks and queen. Half-open for Black: b.
The Black king has 3 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
47... Kf3 48. Bg5 Bc3+ 49. Kc4 Bxe1+
Why it works
- Great move! king to f3 keeps the pressure (+3.9).
- Well found: bishop to c3 (+4.9).
- Strong! bishop to e1 is the sharp choice (+5.0).
- You win a piece — the rook.
- If instead Bg5, then Bc3+ and you stay on top.
Move by move
- 47… Kf3 — king to f3
- 48. Bg5 — bishop to g5
- Bc3+ — bishop to c3 with check
- 49. Kc4 — king to c4
- Bxe1+ — bishop to e1 (capture) with check
Types in this puzzle
Royal fork
A fork with check: the king must move, and the second piece is lost.
A royal fork is a fork with check — one of the two targets is the king itself. The check must be answered first, so nobody is left to rescue the second piece. Look for squares where your piece gives check and simultaneously attacks an undefended queen or rook. It is the most reliable fork of all, because your opponent literally has no choice.
Endgame tactic
Tactics live in the endgame too — strike while material is scarce.
Tactics do not retire when the queens come off: forks, pins and double attacks live on in the endgame. With so little material left, every tactical loss is almost always decisive. The signs are the usual ones — undefended pieces, king and piece on one line, a pawn about to promote. Even in a "technical" ending, scan for a shot before every move, both yours and your opponent's.
Save the piece
The attacked piece can be saved — with profit.
Saving the piece: one of your pieces is attacked, and the job is not to lose it for nothing. There are several tools: retreat with tempo, defend it, block the attack, or create a bigger counter-threat. Before retreating automatically, look for a retreat that attacks something — you save the piece and gain time in one move. The typical mistake is panicking onto the first available square, where the piece gets trapped again.
Provenance
Derived from the Lichess puzzle database (CC0).
Pack 015
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