There are three spell speeds in yugioh and they are speed 1, 2, and 3.
all speed cards are speed one except quickplay spell cards.
There are no spell speed 3 spells.
All traps are speed 2 except counter traps
You can chain a spell speed 2 or 3 to a spell speed one but cannot chain a spell speed 1 to a 1.
You can chain a spell speed 2 to a spell speed 2 and a spell speed 3 to a 2,
you cannot chain a spell speed 2 to a spell speed 3
only spell speed 3's can be chained to a spell speed 3.
If your opponent activates a card at any giving speed and your card matches these requirements and the card's condition if any, you can chain to it.
