A discovered attack appears when one piece moves away and uncovers the line of another.
Three ideas to understand
- The moving piece can create a second threat, producing a powerful double attack.
- Discovered check is forcing because the uncovered line attacks the king.
- Confirm the tactical idea with a complete legality and blunder check before playing it.
Work through a concrete example
Moving a knight off a bishop's diagonal can check with the bishop while the knight attacks a queen.
A reliable thinking process
Start with checks, captures and direct threats, but calculate the opponent's most forcing reply at every step. Track which piece becomes loose after each move and reconstruct the final position before deciding the combination works. A tactical motif is a clue for where to calculate, not proof that a sacrifice is sound.
Common mistake
Focusing only on the uncovered line can miss that the moving piece is captured immediately.
Practice drill
List useful destinations for the blocking piece and compare the two threats created.
Check your understanding
Can the opponent refuse the idea, answer with check, or insert a stronger capture? State the material and king-safety result at the end of the main line, not immediately after the attractive first move.
Take it into your next game
Save one representative position and review it briefly before your next playing session. During the game, do not search for an identical diagram; watch for the same relationship between pieces, squares and pawn structure. Mark the moment when the idea first became relevant, even if you chose another plan. After the game, compare your decision with the lesson and write one adjustment for the next session. This transfer step is more valuable than rereading the article without making a decision.
Finally, explain the position in one sentence without using the lesson title. If the explanation names the relevant squares, pieces and consequence, you understand the idea rather than only recognizing its label. Continue with the related lesson and compare the decision process.