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not to be a pessimist - but that looks like a 23k very hot streak followed by your normal win rate - and maybe I AM TOTALLY offbase on that so do not be offended (not sure your LT WR), however that is a terribly long streak for it not to be a statistical miracle (assuming a 2BB/100 win rate that is)
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You could very well be right, in fact, I am starting to think that myself. However, much of the downswings on that graph are at 10/20 6-max (-3bb/100 in aprox. 7000 hands). If I just filter out the 7000 hands of 10/20 it looks a little better (170,000 of these hands are at 5/10). And this graph is in BB instead of $$.