Tactics Intermediate

The Windmill Combination

ChessBhumi Team 2 min read

The windmill is chess's most devastating tactical pattern: a sequence of alternating discovered checks and regular moves that systematically harvests the opponent's pieces. Once the windmill is set up, each check forces the king to move, after which the attacking piece captures another enemy piece and delivers a new discovered check. It's a perpetual harvesting machine.

How the windmill works

The windmill requires:

  1. A piece that gives discovered checks (typically a knight or bishop that moves to capture enemy pieces).
  2. A piece on the discovery line (typically a rook or queen) that delivers the actual check.
  3. The king must be forced to return to the same squares, allowing the cycle to repeat. On each cycle: the front piece moves and captures something → the back piece gives check → the king returns → the front piece moves and captures again.

Torre vs Lasker (1925)

The most famous windmill in chess history. Carlos Torre sacrificed his queen with 25.Bf6!! forcing 25...Qxh5 26.Rxg7+ Kh8 27.Rxf7+ (discovered check) Kg8 28.Rg7+ Kh8 29.Rxb7+ (discovered check) Kg8 30.Rg7+ Kh8 31.Rg5+ (discovered check) Kh7 32.Rxh5, having captured three pawns and the queen in the windmill. Study the full game in the legends archive.

Setting up the windmill

Windmills don't appear randomly, they require specific setup conditions:

  1. A discovery line must exist (a rank, file, or diagonal through the enemy king).
  2. The front piece must have targets to capture on alternating moves.
  3. The king must be confined to a pattern (usually shuttling between two squares).
  4. Often requires a preparatory sacrifice to create the discovery line or confine the king.

Practice

While complete windmills are rare, the discovery mechanism behind them is common. Training to recognize discovered check opportunities helps you find both full windmills and simpler discovered attack combinations. Look for positions where a piece can move with tempo while a back piece delivers check. Solve discovered attack puzzles to build the pattern. See 75 Tactical Patterns.

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