[curtains]

Honestly, I think that in poker, I'd prefer to play a headsup match against 3 people of equal strength colluding, than one player.

This is very pronounced in blitz chess, when working together with 2-3 people, assuming all are relatively equal strength, generally produces worse results than just playing normally because all the differing viewpoints can be really distracting. At least this has always been my experience.

Whenever I have played poker with someone watching me, it drives me completely insane when they try to give advice that's contrary to what I'm about to do. It's simply impossible to focus when you only have so much time to make a decision.