[henrikrh]

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I don't use that software, could someone explain it to a fool like myself? Does that mean he lost that amount in a week? What software is it and should I be using it?

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It is pokertracker, everything in red is a loss, if he had won a number would appear in green. Basically the guy lost 800k over 10k hands with -18bb/100, possibly the worst losing streak I have ever seen, could onl be due to exceptionally tilted play.