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A discovered check is a discovered attack where the target is the king. One of your pieces steps off a line, and the bishop, rook or queen behind it suddenly gives check. Because your opponent must answer the check, the piece that moved gets a free turn to do whatever damage it can: grab material, attack the queen or set up mate.
It is one of the most powerful patterns in chess. A strong discovered check can feel like playing two moves in a row.
A picture of the idea
White has a rook on e1 and a knight on e5. The black king stands on e8, and the e-file between them is otherwise empty. The black queen is on d8.
The knight is the only thing blocking the rook. White plays Nc6+. The check comes from the rook on e1, not from the knight, but the knight on c6 now attacks the queen on d8. Black has to answer the check, for example by blocking with Qe7 or moving the king, and on the next move White takes the queen. Note that even blocking does not help: on e7 the queen is still in the knight’s reach.
How to spot discovered check
- Look for your own piece in front of a line to the enemy king. That is the setup, and it is easy to overlook because it looks like your piece is just blocking itself.
- Check where the front piece can go. Any square that attacks a loose piece, the queen or a mating square is a candidate.
- Notice when the king is on an open file or diagonal. Kings on the e-file in the middlegame, or on the back rank with an open diagonal, are frequent victims.
- Count your opponent’s ways to meet the check. If they can only move the king, the free move is even more valuable.
Common mistakes
The most frequent error is rushing. Players see the discovered check and play the first move of the front piece that comes to mind. But the front piece can usually go to several squares, and only one of them may win. Treat every possible destination as a separate candidate.
Another mistake is forgetting that the check can be blocked or the checking piece captured. If your opponent can capture the piece giving check, the free move may evaporate.
The windmill
When a discovered check can be repeated, things get wild. In the pattern known as the windmill, a rook and bishop work together against a boxed-in king. The rook slides away along a rank and captures something, uncovering check from the bishop. The king steps to its only free square, the rook swings back with a check of its own, the king steps back, and the cycle repeats. Each turn wins a piece or pawn, and the defender is powerless because every move is forced. You do not need it often, but when it appears, it is unforgettable.
Tips for using discovered check well
- Don’t cash it in too early. A discovered check that is available now is often still available later. Sometimes improving another piece first makes it far deadlier.
- Prefer the destination that also attacks. The best front-piece move makes a second threat, ideally against the queen or a mating square.
- Keep your king off loaded lines. When an enemy piece sits between your king and their rook, bishop or queen, that piece is a loaded gun. Move your king before it fires.
Discovered checks reward imagination. Once the check is guaranteed, the board opens up and your front piece is free to roam.
