Chessy
What Is a Discovered Attack?
A discovered attack happens when one piece moves out of the way and reveals an attack from another piece — usually a rook, bishop, or queen — that was hiding behind it all along.
How it's set up
You need two of your own pieces lined up on the same rank, file, or diagonal, with an enemy piece or king further along that line. When the front piece moves aside, the piece behind it suddenly attacks whatever's on that line — and because the moving piece can do something useful too, you effectively get two threats from one move.
Discovered attack vs discovered check
When the revealed attack targets the enemy king specifically, it's called a discovered check, and it's especially dangerous because the moving piece is completely free to do anything — capture, threaten, or even deliver its own check — while the opponent must deal with being in check first.
Why it's so strong
The power of a discovered attack comes from getting two actions for the price of one move. The piece that moves can capture material, make a threat, or reposition, all while the piece left behind adds a completely separate attack the opponent has to answer. This double-purpose nature is what makes discovered attacks one of the most damaging tactical motifs.
Frequently asked questions
What's the difference between a discovered attack and a pin?
A pin restricts an enemy piece from moving because doing so would expose something behind it. A discovered attack is the opposite idea applied to your own pieces — you move one to unveil an attack from another.
Can any piece cause a discovered attack?
Any piece can be the one that moves aside, but the piece doing the revealed attacking must move in a straight line, so it's always a rook, bishop, or queen behind it.
Why is a discovered check so dangerous?
Because the moving piece is unrestricted — it isn't the one giving check, so it can capture a queen, deliver mate, or make any threat it likes while the opponent is forced to respond to the check.
How do I spot discovered attack opportunities?
Look for your own pieces lined up on the same file, rank, or diagonal as an enemy piece or king, with one of your pieces in between that has a useful square to move to.