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An even stronger form of asymmetric retreat is the fairy piece the <a href='../piececlopedia.dir/locust.html'>Locust</a> as used in <a href='../dpieces.dir/edgehog-chess.html'>Edgehog Chess</a>. It can only move to capture, and captures by leaping over a piece to be captured to land on the empty square just past. Thus, while a Grasshopper can make a symmetrical retreat after leaping over an adjacent piece, a Locust could only make a symmetrical retreat if a hostile piece moved into the square it captured from.