[Dov]

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That's total nonsense. First off, you can have a positive WR in a game that isn't worth playing (or you could have more WR in one game than another). Second, you should try to 'maximize' your WR in any game you're playing.

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This is simply not true.

It depends on why you are playing that game.

I agree with you if your goal is to play this level forever. In that case, then maximizing your winrate for this level makes sense. But if you aspire to move on, then I think that simply need to develop enough skill to do well at the next limit rather than squeeze every last drop of WR out of your current limit.

You will simply make more money by moving up if you have the skill.

A direct example of not maximizing your winrate for a current game is Daniel Negreanu's now well known training exercise 'Nut Bar'.

Obviously, maximizing winrate is not important in this example, developing more advanced skills is.

To readdress the BR question, OP should use his own WR not the rates of other players that he thinks are good.

Dov