bankroll required for multitabling

[Rubeskies]

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Shouldn't the variance decrease since you are playing more hands?

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Varience is a theoretical statistic directly proportional with winrate. The only thing that affects varience directly is your skill level and actual winrate.

Varience cannot be increased or decreased based on volume. Yes your swings will even out much faster, but they will still be there, unchanged, exactly the same as if you were playing only one table. The biggest way to lower varience is to improve your skill level.