The windmill chess tactic is a see-saw of discovered checks that harvests material by force. Learn the mechanics, the Torre-Lasker game, and how to set one up.
The windmill chess tactic, also called the see-saw, is one of the most spectacular and destructive combinations in the entire game. In a windmill a piece delivers a discovered check, the enemy king is forced to step aside, and then the piece returns to capture material with another check, over and over, harvesting pawns and pieces by force while the opponent can only watch their army disappear.
It looks like magic the first time you see it, but the windmill runs on a simple, repeatable mechanism. This guide explains exactly how a windmill works, walks through the most famous example in chess history, and shows you the ingredients you need to build one, along with how to avoid falling victim to one yourself.
How the Windmill Works
A windmill is powered by a discovered check: two pieces work together so that when the front piece moves, a second piece behind it delivers check. The classic setup pairs a rook and a bishop. The bishop sits on a long diagonal aimed at the enemy king, and the rook stands between them or nearby. When the rook moves off the line, the bishop's check is revealed.
Because the check is discovered, the rook is free to move almost anywhere as it uncovers the bishop, including to squares where it grabs enemy pieces. The king, in check from the bishop, must move, and it usually has only one legal square. Then the rook swings back to block the bishop's diagonal again, delivering check itself, forcing the king back to its original square, and the cycle repeats. Each swing of the rook can gobble another pawn or piece.
The reason the opponent cannot escape is that every move is a check. A player in check must respond to the check and cannot use the turn to defend, counterattack, or run the king to safety. The windmill exploits this rule mercilessly, turning the check into a conveyor belt that strips the board bare.
The Most Famous Windmill Ever Played
The definitive example is Carlos Torre against former world champion Emanuel Lasker, Moscow 1925. Torre had a bishop on f6 aiming straight at Lasker's king in the h8 corner and a rook that reached the seventh rank. With the king boxed in, Torre unleashed the see-saw: his rook captured on the seventh rank with check, the king was forced to h8, and then the rook stepped aside to reveal the bishop's discovered check, forcing the king back to g8.
Back and forth the rook swung, capturing a pawn, giving discovered check, returning to check again, until it had scooped up several pawns and, crucially, captured Lasker's queen. Only after the harvest did Torre resolve the position, having won a decisive amount of material against one of the greatest players of all time. The game is still shown to students a century later as the perfect illustration of the windmill.
What makes the example so instructive is the setup: a bishop nailed to the diagonal pointing at a cornered king, and a rook with freedom to roam the seventh rank. Recognize those ingredients and you will recognize a windmill waiting to happen.
Ingredients of a Windmill
To build a windmill you generally need three things. First, an enemy king with very limited escape squares, often boxed into a corner or hemmed in by its own pawns, so that it shuttles helplessly between just two squares. Second, a bishop, or occasionally a queen, fixed on a diagonal that hits the king. Third, a rook positioned to deliver the discovered check and, ideally, to reach a rank or file loaded with enemy targets.
The seventh rank is the classic hunting ground because it is where the opponent's uncaptured pawns and pieces often sit. A rook on the seventh, backed by a bishop on the long diagonal, is the textbook windmill machine. When you see your rook and bishop lined up against a cornered king, stop and check whether a discovered-check see-saw is available; the payoff can be an entire queen.
Defending against a windmill is mostly about prevention. Keep your king's escape squares open, avoid letting an enemy rook settle on your seventh rank while a bishop rakes your king's diagonal, and stay alert to discovered-check setups. Once a full windmill is running it is usually too late; the time to stop it is before the first discovered check ever lands.
The Bigger Lesson: Respect Discovered Checks
The windmill is really an extreme case of a broader theme. The discovered check is one of the most powerful tactics in chess precisely because the moving piece is immune from the usual rules of exchange. It can capture a defended piece, land on an attacked square, or ignore a pin, all because the opponent must first deal with the check from the piece behind it.
Even when a full windmill is not on the board, the same idea wins material constantly: a discovered check that grabs a hanging queen, or a discovered attack that forces a fatal choice. Learning to spot the moment when moving one piece unveils an attack from another will sharpen your whole tactical vision, not just your ability to build see-saws.
Study a handful of windmill games, then practice recognizing the simpler discovered checks that appear in everyday play. The pattern recognition you build will let you feel the danger, or the opportunity, the instant two of your pieces line up behind one another against the enemy king.
Build Your Own Windmill
The windmill turns a rule of chess, that you must answer every check, into an unstoppable machine. Remember the ingredients, a cornered king, a bishop on the diagonal, and a rook free to swing with discovered check, and you will start seeing see-saws that win games outright.
Try it for yourself: play a game on XiangqiPlay, look for chances to line up a rook and bishop against a boxed-in king, and drill discovered-check puzzles in the trainer to speed up your eye. Then explore Xiangqi, where the cannon's jump-to-capture rule creates discovered attacks and battery tactics unlike anything in Western chess.