Changes

A player can Fusion Summon a Fusion Monster from the Extra Deck by [[activate|activating]] a card or effect that performs a Fusion Summon. When that effect resolves, the player uses appropriate [[Fusion Material]]s listed on a Fusion Monster by moving them from some location(s) to another location, as specified by the effect performing the Fusion Summon (usually [[send]]ing them to the [[Graveyard]] or [[banish]]ing them). After that, the player Summons the Fusion Monster from the [[Extra Deck]] to an unoccupied [[Main Monster Zone]] that a [[Link Monster]] [[Link Point|points]] to or an [[Extra Monster Zone]] in [[face-up]] [[Attack Position|Attack]] or [[Defense Position]].

Even if all appropriate Monster Zones are occupied, a Fusion Monster can still be Fusion Summoned as long as at least one of the Fusion Materials used is in one of these Zones, so that there is an available Zone when the Fusion Monster is Summoned.