Discovered attack: knight to e4 (c5)
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The tactical motive
Discovered attack: one piece steps aside, unleashing another's attack.
Difficulty 1959 ShuffleRating — for advanced tacticians.
Black 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 d2, rook d1 c2, knight b1 c6, pawn g2 h2 a3 f3 e4 d5.
Black: king g8, queen b6, rook d7 e8, bishop g7, knight c5, pawn d6 g6 a7 f7 h7.
12 white and 11 black pieces are on the board; the puzzle position arises after move 32.
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 g8.
It is Black to move on move 32, with 50 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): b, c — natural highways for the rooks and queen. Half-open for Black: e.
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
32... Nxe4+ 33. Kf1 Nxd2+
Why it works
- Great move! knight to e4 keeps the pressure (+5.4).
- Well found: knight to d2 (+5.7).
- You win a piece — the queen.
- If instead Kf1, then Nxd2+ and you win the queen.
Move by move
- 32… Nxe4+ — knight to e4 (capture) with check
- 33. Kf1 — king to f1
- Nxd2+ — knight to d2 (capture) with check
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 check
The moving piece opens a check — and is free to grab anything meanwhile.
With a discovered check the moving piece unmasks a check from the piece standing behind it. While the king deals with the check, the piece that moved grabs whatever it likes, free of charge. Look for your long-range piece on a line with the enemy king, with exactly one of your own pieces in between. The rule: among all the ways to step aside, pick the one that captures or attacks the most expensive loot.
Check chase
Every move is a check — the king is chased into losing ground.
In a check chase every one of your moves is a check, so the opponent never gets a free second. The king is herded across the board until it loses a piece or walks into a decisive blow. Such lines are the easiest to calculate: each check allows only a handful of replies, so try them all. Make it a habit to start calculating any sharp position with the checks — they are the most forcing moves on the board.
Provenance
Derived from the Lichess puzzle database (CC0).
Pack 014
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