Simultaneous Effects Go On Chain

Sometimes, you will have simultaneous effects attempting to activate at the same time, such as when Mystic Tomato attacks another Mystic Tomato, or 2 Sangans are sent to the Graveyard at the same time, because of the effect of Dark Hole.

Whenever you have simultaneous effects, you always resolve them in a Chain, even if they are Spell Speed 1 effects. This is a special case when Spell Speed 1 effects can be chained to each other, because they are all trying to activate at the same time, and the players are not choosing to activate them.

If only one player has simultaneous effects being activated, or effects that resolve in a specific Phase (Such as when the effects of Brain Control, Change of Heart, and Interdimensional Matter Transporter]] all have to resolve during the End Phase, then that player can choose the order in which they resolve.

In cases such as this, the Turn Player is the one whose effect will go first on the Chain as Chain Link 1, followed by the opponent, who automatically becomes Chain Link 2. The Chain then resolves in reverse, so the opponent will get the resolution of his effect first, followed by the Turn Player.