Finally got an "A" from pokergrader and...

[krazyace5]

I have gotten a few A sessions at $50 nl 6 max, is that low limit enough.

[OrangeKing]

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(since it is nearly impossible to judge somebodies skill based on 100-500 hands).

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Based on the results of those hands, it's impossible...but you can certainly get a fair handle on someone's skill level based on how they played those 100-500 hands, I think.