Fork: knight to e7 (d5·4)
li-03pfKnaming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Fork: one piece attacks two targets at once — they can't both be saved.
Difficulty 1181 ShuffleRating — club-player level.
White to move — find the best continuation
How to recognize this tactic
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.
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, queen g3, rook a1 h1, knight d5, pawn a2 b2 c2 f2 g2 h2 e4.
Black: king g8, queen a5, rook b8 f8, bishop c6 h6, pawn e5 a6 d6 f7 g7 h7.
12 white and 12 black pieces are on the board; the puzzle position arises after move 19.
The position in numbers
Black are ahead by 2 points of material (29 against 31; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on g8.
It is White to move on move 19, with 38 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 7 pawns, Black 6. No file is fully open, so the heavy pieces have to be pried in. Half-open for White: d.
Black hold the bishop pair, an edge in open lines. 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
19. Ne7+ Kh8 20. Nxc6 Qa4 21. Nxb8
Why it works
- Great move! knight to e7 keeps the pressure (+3.0).
- Well found: knight to c6 (+3.0).
- Strong! knight to b8 is the sharp choice (+2.9).
- You win a piece — the rook.
- If instead Kh8, then Nxc6 and you win the bishop.
Move by move
- 19. Ne7+ — knight to e7 with check
- Kh8 — king to h8
- 20. Nxc6 — knight to c6 (capture)
- Qa4 — queen to a4
- 21. Nxb8 — knight to b8 (capture)
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.
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.
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 007
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