[kem]

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In that case the river card would deviate from what should be dealt at random and with a large enough sample it will be caught.

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Right, but it's not as if the same river card would come up all the time (i.e. it isnt going to be the ace of spades every time). It'll be slightly more weighted to help all the players, but that is totally dependent on what the other players have. So realistically, you are never going to get a sample size large enough to catch this. Theoretically, sure, but in real life, no.