I got a message saying the lower seed in the matchup gets to choose the variant. I am the lower rated seed against my opponent
@Tetiksh1Agrawal so I choose the variant. My question is, do I have to choose a common variant that both of us have chosen or can I choose I variant I have chosen but he hasn't?
Both players choose one variant (in their opponent's list), and then 6 games of *each* variant are played. You pick from their list (and they pick from your list), it doesn't have to be a common variant, it just has to be on their list.
for your opponent Tetiksh1Agrawal, you must choose in the following list : zh, anti, koth
Your list is zh/atom/koth : you cannot choose atomic because it's not on their list, and conversely they can't pick antichess because it's not on yours.