[scampini]

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On Pokerstars the whole deck is determined before any cards are dealt. However, if someone knows what the flop turn and river cards are, then they probably know the hole cards, and that's almost as bad.

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If that's true, then yes it is possible to know the flop/turn/river before it happens. However, it would require a master's knowledge of data encryption and network security to pull it off. Someone with this level of rare intelligence would have much bigger fish to fry than low-stakes poker games.