[MURK]

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The only thing I don't know is how PT or your poker site calculate rakeback. I am pretty sure that PT takes the total rake and then divides it by the number of players, which is alo - I believe - how most poker sites do it.

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the general stats tab on PT shows the amount of rake paid in the pots that you won, so it isn't really accurate to calculate the RB you're due.

for 27% dealt RB you want to use the summary tab - filter out observed hands and then divide the total rake by the number of players, then multiply that by .27 which should be pretty much bang on.