[Aaron W.]

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I stuck my worst money loss session in that PokerGrader website and all the results had big red "BAD LUCK" next to them, but I don't know how reputable that website is around here...

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A better thing to do is to review how you played your hands. Are you down because of a few massive pots that didn't go your way, or are there lots of little pots which are contributing to a slow decline?

Ultimately, the way to tell if you have bad luck or bad play is to know what good play is, and see if your play matches it.