A windmill in chess is a devastating combination where a rook and bishop work together to deliver a repeating series of discovered checks, letting you capture enemy pieces one after another. The opponent is helpless because every move you make gives check, and they must respond each time.
It is one of the most spectacular patterns in the game.
How the windmill works
The windmill needs two ingredients: a bishop giving a long-range check, and a rook next to the enemy king that can move back and forth. Each time the rook steps aside, the bishop gives check (a discovered check). The opponent must answer the check, so on the way back the rook grabs a piece — then repeats.
- Rook moves away → bishop checks the king.
- Opponent must respond to the check.
- Rook returns, capturing a piece with check.
- Repeat, harvesting material each cycle.
The opponent can never escape because they are in check on every single move.
Why it is unstoppable
The whole trick rests on the rule that you must get out of check immediately. Since each cycle of the windmill delivers a check, the opponent never gets a free move to break the pattern or defend their pieces.
Fact: the most famous windmill appeared in Torre vs Lasker (1925), where a windmill won a huge amount of material against a former world champion — the classic example taught to every improving player.
Recognizing the setup
Look for a windmill when you have:
| Ingredient | Role |
|---|---|
| Rook beside the enemy king | Does the capturing |
| Bishop on a long diagonal | Delivers the discovered checks |
| Loose enemy pieces nearby | The harvest |
How to use it
- Spot a bishop aimed at the enemy king through a movable rook.
- Check that moving the rook reveals a check.
- Sweep back and forth, capturing pieces with each returning check.
- Stop when you have won enough or found a mate.
A pattern worth knowing
The windmill does not appear in every game, but when the pieces line up, it is crushing — and knowing the pattern helps you both spring it and avoid walking into it.
Study the Torre-Lasker example, practice spotting the rook-and-bishop setup, and you will be ready to unleash one of chess’s most beautiful and brutal combinations the moment it appears on your board.