A discovered attack is a tactic where one piece moves out of the way to reveal an attack from a piece hidden behind it — so you strike with two pieces in a single move. The moving piece can go make its own threat, while the “discovered” piece hits a second target the instant the line clears.
It’s one of the most powerful ideas in chess because the two threats are made by different pieces, so they’re maddeningly hard to meet at once. When the unveiled attack is a check, it’s a discovered check — and the moving piece can grab something with total impunity, since the opponent has to answer the check first. Best of all is the double check, where the moving piece and the unveiled piece both give check: the king is forced to move, full stop.
The 10-second version
- A front piece moves, uncovering an attack from the piece behind it.
- Two pieces attack in one move — very hard to parry both.
- Uncover a check (discovered check) and the front piece can grab anything.
A quick example
The knight on e5 is standing in front of the rook on e1, blocking its line to the black king on e8. White plays Nxc6+: the knight captures the queen and, by leaving the e-file, uncovers the rook’s check on the king. Black must deal with the check, so there’s no time to save the queen — White simply keeps it. Two hits, one move.
Related terms
This is the short version — our full discovered attack guide breaks down discoveries, discovered checks, and double checks, and you can train them on the discovered attack puzzles page. Browse the tactics hub or the chess glossary for more. It sits alongside the other core motifs — the fork, the pin, and the skewer.
Mini-FAQ
What’s the difference between a discovered attack and a discovered check? A discovered check is just a discovered attack where the unveiled piece attacks the king. The mechanism is identical — a front piece moves to reveal the piece behind it.
What makes a double check so strong? Both the moving piece and the unveiled piece give check at once. You can’t block two lines or capture two attackers in one move, so the king is forced to move — no other reply exists.
Written and fact-checked by the Chess Lab Academy Editorial Team (AI-assisted, human-edited) · Position legality-checked with python-chess · Definition verified against Wikipedia and standard references · Last verified 2026-07-13 · How we verify content.