Thanks jcl. Yes, it is tricky!

What probability exactly increases over time? Probability of a drawdown happening? Probability of a greater drawdown? Probability of more frequent drawdowns accumulating to a larger total drawdown? It seems it must be one or a combination of some or all of these (& maybe more) to account for the need to keep square root rule capital on the account...

Similarly, let's take a closer look at the 2 $500 accounts that each now have a balance of $650 - the 1st after 9 years and the 2nd after 1 year. If there is some greater probability of larger drawdown that grows with the duration of trading, then I don't understand why I can take the same $80 out of each account. Since they've been trading for different lengths of time, their probabilities must be different, right? And so I can either take more out of the 1 year account or have to take less out of the 9 year account?

Thanks.