Loyd-Zepler doubling

Zepler doubling, in which two pieces are of different strength and the weaker one first makes an anti-critical move (and subsequently the stronger one comes behind).

⧖ Samuel Loyd (USA, 1830-1914); Erich Zepler (Germany/Great Britain, 1898-1980)

See also: Zepler doubling; Loyd-Turton doubling.