[4_2_it]

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Yes, a winrate of 8ptbb/100 is sustainable.

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Not really. Anyone good enough to pull it off moves up before they get even close to a big enough sample size to mean anything. 8ptbb/100 LONGTERM is very tough.

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A little bit off topic here. Is there any qualitative difference between 100 and higher limit?

Lets assume someone has 8ptbb/100 at 100NL level, what's his expectaion at 200, 400?

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My winrate at NL $100 and $200 is within .5 PTBB after 50k and 25k hands, respectively. My expectation is not to see an increase in my win rate as I move up. I would much rather try to maintain my current win rate. Maintaining your current NL$100 win rate at NL $400 means you are making 4 times your NL $100 earn. That's much more realistic goal as to what is attainable than shooting for a magic number.