Pin: knight to f3 (d2)
li-03D2Vnaming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Pin: a piece can't move without exposing something more valuable behind it.
Difficulty 1155 ShuffleRating — club-player level.
Black to move — find the best continuation
How to recognize this tactic
A pin freezes a piece in front of a more valuable one behind it. Scan the ranks, files and diagonals your bishop, rook or queen controls: if an enemy piece cannot move without exposing its king or queen, it is pinned and can be piled on or bypassed.
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 h4, rook d1 e1, pawn f2 g2 a3 c3 h3.
Black: king f8, queen c7, rook g8, knight d2, pawn c5 b6 e6 a7 f7.
9 white and 9 black pieces are on the board; the puzzle position arises after move 26.
The position in numbers
White are ahead by 2 points of material (24 against 22; 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 f8.
It is Black to move on move 26, with 34 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 5 pawns, Black 5. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for Black: g, h.
The Black king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
26... Nf3+ 27. Kf1 Nxh4
Why it works
- Great move! knight to f3 keeps the pressure (+7.1).
- Well found: knight to h4 (+7.2).
- You win a piece — the queen.
- If instead Kf1, then Nxh4 and you win the queen.
Move by move
- 26… Nf3+ — knight to f3 with check
- 27. Kf1 — king to f1
- Nxh4 — knight to h4 (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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