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Windmill
Windmill2

A windmill is a series of alternating checks and discovered checks that stalls any resistance from the opponent by forcing the king to continually move, while simultaneously also looting massive amounts of material with its exploitation of repeated discovered checks. The windmill consists of two pieces working in collaboration: a "base" and a "blade", a bishop usually being the former and a rook the latter. The base remains in place and deals the discovered checks whenever the "blade" moves out of its line of sight of the king. The blade constantly moves in and out of the base's line of sight of the king and delivers the checks. It's also the windmill's source of profit: it captures a piece whenever it moves out of the line of sight. The king must only have two squares to go to: one where it can be checked by the blade, and one on the line of sight of the base. When the king is on the base's line of sight and the blade relocates to capture a piece, the king is forced to move to the other square because it is in check from the base. When the blade comes back to its original square, it checks the king, and the king moves back into the base's line of sight of the base and the cycle repeats, just like a windmill would.

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