If a card specifically states it affects an “opponent,” and any part of the card’s effect affects your opponent’s hand, Deck, Extra Deck, Graveyard, or Banished Zone, then the Duelist activating the card effect must choose the opponent sitting directly across from them.

Examples

Duelist 1A activates Secret Barrel. Only the cards for the opponent sitting directly across from him will count for its effect.

Dueliast 1A activates Smashing Ground. Duelist 2A activates Dark Bribe. Once Dark Bribe resolves, Duelist 1B will draw the card off of the effect of Dark Bribe as Duelist 1B is the one seated directly across from Duelist 2A.

If a card affects only your opponent’s side of the field, it affects the entire side, or both opponents.

If a card specifically states it affects all Duelists, Monsters, Spells, or Traps, then it affects both Teams (all 4 Duelists.)

If a card affects “both Duelists” or “each player,” then the Duelist activating the effect and the opponent sitting directly across from them are affected.

Examples

Duelist 1A has Hand Destruction and two other cards in her hand. Duelist 2A only has one card in hand but Duelist 2B (Duelist seated directly across Duelist 1A) has 2 cards in hand. Duelist 1A can activate Hand Destruction as it only counts the Duelist activating the card and the Duelist sitting directly across from him.

If a card references another card that “you control” or “your” hand, Deck, Extra Deck, Graveyard, or Banished Zone, it counts cards in your teammate’s Zones as well as your own. In the same way, cards that reference a card “your opponent controls” count both opponent’s sides of the field.

Examples

Duelist 2A and 1A each have a Monster on their side of the field. Duelist 1B may not Special Summon Cyber Dragon as his teammate controls a monster.

Duelist 1A has a face-up Vanity’s Emptiness. If a card is sent from Duelist 1B’s Deck or side of the field to the Graveyard, Vanity’s Emptiness is destroyed.

Duelist 1A has a face-down Spell/Trap Card. His teammate may not activate the effect of Treeborn Frog that would Special Summon itself from the Graveyard as his teammate controls a Spell/Trap Card.

A Duelist can allow their teammate to use monsters in their Monster Card Zones as Tribute Summons, Ritual Summons, Extra Deck Summons, or for other appropriate card effects.

Cards Set by a Duelist can be viewed by the teammate, but they must be activated by the Duelist who Set them.

“Owner” means the same thing as a standard Duel. The “owner” is the Duelist whose

Deck the card started in

If a card effect prevents your opponent from performing an action, it prevents both opponents. If a card prevents you from performing an action, it prevents your teammate as well.

Examples

Duelist 1A has a face-up Kycoo the Ghost Destroyer on his side of the field. Neither Duelist 2A and 2B may Banish cards from their Graveyards.