[BluffTHIS!]

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I thought it was more. Something like 90%

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A couple years or so ago Sklansky posted here that it was 90% for live games and that the reason for this was the amount in rake that the losers had to lose in order for a winning player to make 1BB/hr. Although the total dollar amount of rake is much larger online because of the number of hands played, the rake is usually proportionally less per hand so that might indeed lower the 90% figure to 75%. If the losers multitable though, even the effect of lower rake will accelerate in time, and so the 90% figure might be applicable after all.