Plachutta

The Plachutta is a device found in chess problems: a white piece sacrifices itself on a square where it could be captured by one of two similarly-moving black pieces (for example, a bishop and a queen moving along a diagonal, or two rooks) moving along a different line; whichever black piece captures, it interferes with the other. Plachutta theme is named by Joseph Plachutta (1827–1883).