After Nf6+
What Is a Discovered Attack?
A discovered attack is a tactic where moving one piece unmasks an attack from a long-range piece (bishop, rook, or queen) sitting behind it. The moving piece can do anything it wants — capture, threaten mate, attack the queen — while the unveiled piece delivers a separate threat.
The key insight: one move, two attacks. Almost no other chess tactic gives you that kind of efficiency. The opponent gets one move to respond, but they're facing two problems. Something has to give.
The Three Pieces of a Discovered Attack
Every discovered attack involves three pieces in a specific arrangement:
- The hidden attacker. A bishop, rook, or queen of yours, sitting on a line that points at an enemy target.
- The blocking piece. Your own piece sitting between the hidden attacker and the target, blocking the attack.
- The target. The enemy piece (often the king or queen) that will be attacked when the blocker moves.
When you move the blocking piece, the line opens and the hidden attacker strikes. Meanwhile, the moving piece itself can attack or threaten anything in its new location.
Discovered Check
A discovered check is a discovered attack where the revealed line attacks the enemy king. This is one of the most forcing moves in chess — the opponent must respond to the check, so the moving piece is essentially free to do anything else on the board.
Classic example: your knight stands between your bishop and the enemy king. You move the knight to capture the enemy queen. The opponent is in check from your bishop and must address that first. Next turn, the queen is gone.
Double Check
A double check is the strongest move type in chess. It's a discovered check where the moving piece also gives check, so the enemy king is in check from two different pieces at once.
Why double check is so powerful: blocking only stops one check, and capturing only deals with one checker. The only legal response is to move the king. This means double check often delivers immediate checkmate, especially when the king has no safe squares.
Many of the most beautiful combinations in chess history end with double check. Reti's "smothered mate" pattern, Lasker's combinations, and countless Morphy brilliancies all rely on double check.
How to Set Up a Discovered Attack
Discovered attacks rarely appear by accident. Here's how to manufacture them:
1. Identify Hidden Attackers
Look at your bishops, rooks, and queens. Find lines from these pieces that point toward valuable enemy pieces — especially the king and queen. Any of your own pieces on those lines is a potential discovered attack blocker.
2. Find Good Moves for the Blocker
The blocking piece needs somewhere productive to go. The best discovered attacks happen when the blocker can deliver its own threat — capture a piece, threaten mate, fork two targets. The discovered attack only really wins when both pieces threaten something serious.
3. Force the Setup
Sometimes you need a preparatory move to align the pieces. A bishop sacrifice that draws the king onto a diagonal where your rook hides; a rook lift to create a discovery line; a queen move to set up the threat. Look for these preparatory sequences in tactical puzzles.
Classic Discovered Attack Patterns
The Knight Hops Out
A common pattern: your bishop sits on c1, your knight on d3, and the enemy king sits on e1 with no pieces between. Move the knight (Nxe5 or anywhere useful) and the bishop discovers check. The knight is now free to capture or threaten anywhere.
The Battery Discovery
You have a queen behind a rook on the e-file. The enemy king is on e8. Your rook moves to e7 with check (or captures something), discovering the queen behind. Many endgame combinations work this way.
The Greek Gift Followed by Discovery
After Bxh7+ Kxh7, Ng5+ comes with double threat. Then often a queen move uncovers a deadly bishop attack from elsewhere on the board.
How to Defend Against Discovered Attacks
Defense is hard because the threat is invisible — the hidden attacker hasn't acted yet. Defenses include:
- Watch for piece alignment. If your king and queen are on the same line as enemy pieces, beware. Move one off the line before a discovered attack can fire.
- Defend the blocker's destination squares. The blocker has to go somewhere productive. Defend the squares that would let it capture or threaten.
- Don't leave loose pieces. A discovered attack on a defended piece costs less. Loose pieces become discovered attack victims.
- Trade off attackers. Exchanging the hidden attacker eliminates the discovery threat entirely.
Discovered Attack vs Other Tactics
The discovered attack is structurally different from the fork, pin, and skewer because it uses two pieces working together. Forks attack with one piece on two squares; pins and skewers use a single line through three pieces. Discovered attacks use two attackers on different lines at the same time — which is why they're often game-ending.
Questions players ask about this tactic
What is a discovered attack?
A discovered attack happens when you move one piece, revealing an attack from another piece behind it. Two pieces attack different targets in a single move, which is why discovered attacks are so devastating.
What is a discovered check?
A discovered check is a discovered attack where the revealed attack delivers check to the enemy king. The moving piece is free to make any threat or capture because the opponent must respond to the check first.
What is a double check?
A double check is when the moving piece also delivers check, so the enemy king is in check from two pieces at once. The only legal response is to move the king — blocking or capturing won't work since both checks must be addressed.
Why is the discovered attack so powerful?
Because two pieces attack in a single move. The moving piece can capture, threaten mate, or attack a queen — while the discovered piece threatens something else entirely. The opponent usually can't address both threats.
Related Tactics
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