How long have you played break even poker?

[SomethingClever]

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is 100K hands enough to really determine whether you’re a winning player or not? Should it be closer to 150K or even 200K hands to really get a good grasp on your true win rate?

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100K is usually more than enough to determine with 99% confidence that you're a winning (or losing) player.

To get a good grasp on your "true" win rate, you do need much more.

Search the archives for posts on calculating your "true" win rate with various confidence intervals.