Fork: knight to f3 (e5)
li-01lB9naming 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 900 ShuffleRating — for beginners taking their first steps in Chess960 tactics.
Black 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 d4, rook b1 f1, bishop d3 f4, pawn f2 h2 a3 g3 c4 d5.
Black: king c8, queen b8, rook d8 h8, bishop d7, knight e5, pawn h5 f6 a7 b7 g7.
12 white and 11 black pieces are on the board; the puzzle position arises after move 21.
The position in numbers
White are ahead by 1 points of material (31 against 30; 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 c8.
It is Black to move on move 21, with 35 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 5. Files fully open (no pawns of either colour): e — natural highways for the rooks and queen. Half-open for Black: c, d.
White hold the bishop pair, an edge in open lines. The Black king has 1 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
21... Nf3+ 22. Kg2 Nxd4 23. Bxb8 Kxb8
Why it works
- Great move! knight to f3 keeps the pressure (+3.0).
- Well found: knight to d4 (+3.5).
- Strong! king to b8 is the sharp choice (+3.1).
- You win a piece — the queen.
- If instead Kg2, then Nxd4 and you win the queen.
Move by move
- 21… Nf3+ — knight to f3 with check
- 22. Kg2 — king to g2
- Nxd4 — knight to d4 (capture)
- 23. Bxb8 — bishop to b8 (capture)
- Kxb8 — king 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 004
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