It's possible in 2 ways (one of which was part of the full tilt scandal)
1 way) this is least common; staff working with the site sit at tables and know all cards.
2 way) much more common, 2 people work together in same cash game or tournament, share cards with each other giving double the info anyone else has
Variants of 2: teams of 3 or solo people who literally open 2 separate bank accounts and use Ip proxies to be able to multi-account
I have totally thought this! Like the guy who goes all-in with 23 and gets 4 callers and somehow he is the winner??? I mean, it's just not right. I would never ship my stack with 23 pre-flop and expect to win.Did you ever thought that someone is cheating on online poker or is that even possible somehow??
Sometimes I've got a feeling that some people know what cards will be opened...