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Guided lesson · Improver · Middlegame

The discovered attack

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The discovered attack is the tactic with the best magic trick in chess: you move ONE piece and TWO attack — the one that moves and the one that was hiding behind it. When the one behind gives check, the one in front gets a free pass: it can capture whatever it wants, threaten whatever it wants, land wherever it wants, because the opponent is forced to deal with the check. You'll see it in the most instructive Petrov trap — half the club players out there have fallen for it — and in its pure endgame pattern.

The key idea

In a discovered attack with check, the piece that moves plays FOR FREE: it picks its best threat without fear of anything, because the opponent can only deal with the check from behind.

Example 1 · The Petrov's discovered attack: the ghost queen

Petrov's Defence: Black mirrored one move too many and recovered their knight quite naturally. White's queen on e2 looked passive. It was a loaded shotgun.

  1. Nc6 The discovered attack! The knight steps aside from e5 and the queen on e2 fires down the open file: check. And look WHERE the knight has chosen to land with its free turn: attacking Black's queen. Check from behind, a deadly threat from in front — the full package.
  2. Qe7 The only dignified reply: block the check while offering the trade. Everything else lost the queen outright (the pawn on d7 can't block: it would just end up pinned to no effect, and the king has nowhere to go).
  3. Nxe7 The knight harvests the queen. Its free turn, cashed in at maximum price.
  4. Bxe7 Black recovers the knight and the count passes sentence: queen for knight. The engine rates it a decisive win. The whole operation was born from an invisible lineup — White's queen behind its own knight, aiming at the king down a file that would open. Learn to SEE those loaded shotguns: your own, and above all, the opponent's.

Example 2 · The pure pattern: discovered check and harvest

No opening, no context: bare geometry. Rook behind, knight in front, and Black's queen within reach of the jump.

  1. Nb3 The knight steps aside and the rook on d1 gives check from behind. And the jump, as always in a discovered attack, isn't to just anywhere: it attacks the queen on a5. Two threats, one move, and only one possible reply.
  2. Kc7 The king deals with the check — interposing the queen on d5 would also lose it. Black's queen is left orphaned.
  3. Nxa5 Harvest: a whole queen for nothing.
  4. Kb6 The king chases the knight, looking to salvage something from the wreck.
  5. Nb3 And the knight comes home with its loot — the return ticket you already know from the fork. The pattern for your radar: two of your pieces lined up with something valuable of the rival's = a discovered attack in the making. Load it, aim the front piece… and fire when the harvest is at its biggest.

Practice

The shotgun is loaded: your queen on e2 aims down the e-file, and your knight on e5 is the one blocking it. Fire the Petrov discovered attack and cash in the queen.

  1. The perfect discovered attack! Check from the queen behind AND your knight lands attacking Black's queen. The free turn, invested in the biggest target. Your knight is blocking your queen's shot. Move it aside… to the square from which it attacks the most expensive piece on the board.
  2. Queen harvested. The block was the only defence, and it only postponed the price: queen for knight, sentence signed. They blocked the check with the queen: your knight has it one jump away.

The discovered attack, fired by you: the piece behind pins things down with check, the piece in front plays for free and picks its loot. From today you'll check every lineup of your own pieces — and fear the opponent's: loaded shotguns don't give warning.