[Octopus]

[ QUOTE ]
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.

[/ QUOTE ]

No! Variance is not proportional to win rate. Improving your skill will not lower your variance (unless you are a LAG). (The better I get, the higher my variance gets, because I am not so weak-tight.)

The answer to the original quesiton is this: The probability of bankruptcy (losing your bankroll) is a function of your win rate and of your variance per hand. Playing multiple table increases your variance per HOUR, but should have no effect on your variance per HAND (assuming your play does not change).

The magic 300BB rule is based on a typical win rate per hand and a typical variance per hand (and assumptions about how averse you are to bankruptcy). Assuming these do not change because you are playing multiple tables, there will be no change in your required bankroll.