Discovered attack: knight to f6 (d5·2)
li-050qonaming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Discovered attack: one piece steps aside, unleashing another's attack.
Difficulty 1253 ShuffleRating — club-player level.
White 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.
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 d1, rook a1 e1, bishop c1, knight f3 d5, pawn a2 b2 f2 h3 g4 e5.
Black: king g8, queen d7, rook a8 e8, bishop b6 g6, knight c6, pawn b5 a6 c7 f7 g7 h7.
13 white and 13 black pieces are on the board; the puzzle position arises after move 18.
The position in numbers
Material is level — 34 points of pieces on each side (pawn = 1, knight and bishop = 3, rook = 5, queen = 9).
The white king stands on g1, the black king on g8.
It is White to move on move 18, with 41 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 6 pawns, Black 6. Files fully open (no pawns of either colour): d — natural highways for the rooks and queen. Half-open for White: c.
Black hold the bishop pair, an edge in open lines. The White king has 4 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
18. Nf6+ gxf6 19. Qxd7
Why it works
- Great move! knight to f6 keeps the pressure (+5.2).
- Well found: queen to d7 (+5.2).
- You win a piece — the queen.
- If instead gxf6, then Qxd7 and you win the queen.
Move by move
- 18. Nf6+ — knight to f6 with check
- gxf6 — pawn to f6 (capture)
- 19. Qxd7 — queen to d7 (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.
Discovered attack
A piece steps aside and opens a second attack from the piece behind it.
A discovered attack works like a curtain: one piece steps off the line and unveils the long-range piece behind it. The beauty is that the moving piece can create a second threat of its own — two attacks in one move. Look for your stacked pairs: a bishop or rook behind a knight or pawn, aimed through them at something valuable. Send the front piece to the most aggressive square — a discovery without a second threat wastes half its power.
Clearance
Clear your own piece out of the way — with tempo — for the decisive blow.
Clearance is about your own piece standing in the way of the decisive blow — so you move it aside, or even throw it away. The key is to clear with tempo: jump off with a check, a capture or a threat, giving the opponent no time to regroup. The telltale sign: you see a crushing queen or rook move, but one of your own pieces blocks the line or occupies the square. Do not cling to it — a clearance sacrifice usually costs less than a missed attack.
Provenance
Derived from the Lichess puzzle database (CC0).
Verified by Stockfish at depth 20+.
Solution forcedness confirmed (verified).
Pack 009
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