How do you manage your bankroll?

[sammy_g]

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I would use a 300BB bankroll and move down at a minimum when your bankroll drops to 200BB.

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Maybe someone can clear something up for me. I thought the whole point of 300BB is so that you can absorb any swings *without* moving down in limits if you know you are a winning player. If you are disciplined enough to move down in limits after losing 100BB, shouldn't you be able to get by with less?

One problem I see is if you are new to a limit, you don't know your win rate. If you don't know your win rate, you can't really calculate what bankroll you need. You can't play at a new limit until you know you are properly bankrolled. Sort of a chicken/egg problem.