Board Game Arena

Hi, apologies if known topic, I failed to find answer quickly.

What happens within tournaments between redthumbed players?

In the tournament, the red thumb is not valid.
See FAQ

"If you think a player behaved badly during a game, you can give them a 'red thumb' at the end of the game. The effect of a red thumb is:
This player won't be able to play with you anymore (except if you meet in a tournament).
This player won't be able to send you private messages, or to watch your game as a spectator.
A red thumb may also contribute to lowering this player's reputation (see 'Reputation/Karma' for more details)."

Thank you!