exchange doubly defered Fischer vs J L Alvarez del Monte, 1960  (C85) Ruy Lopez, Exchange Variation Doubly Deferred (DERLD), 37 moves, 1-0 exchange doubly defered A Kremenietsky vs Balashov, 1982 (C85) Ruy Lopez, Exchange Variation Doubly Deferred (DERLD), 34 moves, 0-1 2 games