Fork: knight to c3 (e4·3)
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The tactical motive
Fork: one piece attacks two targets at once — they can't both be saved.
Difficulty 2567 ShuffleRating — expert level — few solve it at first try.
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 a1 f1, bishop e5, pawn a2 b2 c2 f2 g2 h2.
Black: king e8, queen a8, rook g8, bishop d7, knight e4, pawn e6 a7 f7 h7.
11 white and 9 black pieces are on the board; the puzzle position arises after move 17.
The position in numbers
White are ahead by 4 points of material (28 against 24; 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 e8.
It is Black to move on move 17, with 35 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 4. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for Black: b, c, g.
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
17... Nc3 18. f3 Ne2+ 19. Kh1 Nxd4
Why it works
- Great move! knight to c3 keeps the pressure (+3.9).
- Well found: knight to e2 (+3.7).
- Strong! knight to d4 is the sharp choice (+3.7).
- You win a piece — the queen.
- If instead f3, then Ne2+ and you stay on top.
Move by move
- 17… Nc3 — knight to c3
- 18. f3 — pawn to f3
- Ne2+ — knight to e2 with check
- 19. Kh1 — king to h1
- Nxd4 — knight to d4 (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.
Quiet move
No check, no capture — yet this modest move decides the game.
A quiet move gives no check and takes nothing — yet it decides the game by creating an unstoppable threat or stealing the king's last square. This is the hardest class of moves: the eye hunts for loud blows while a modest shift does the winning. The clue: every forcing try runs into a defense, so seek the move that strengthens the threat or takes squares away. Train yourself to ask: what if I neither capture nor check, but quietly improve?
Provenance
Derived from the Lichess puzzle database (CC0).
Pack 015
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