[MoDOH]

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So if, for example, a bad player who did not know how to play very well started with 1,000 BBS: He went through the various cycles of winning and losing with many peaks and valleys over the course of 500,000 hands but wound up broke after these 500,000 hands... He could then say he was on a 1,000BB Downswing.

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I think you have to be a winning player to be able to say that you are experiencing or had experienced a downswing. If you are a losing player you aren´t exactly on a downswing are you?

Strictly speaking a winning player that has a proven winrate of 2BB/h could be said to be on a downswing if his winrate drops to 1BB/h over a long enough timespan. Of course almost no one can be sure what their true winrate is, but nonetheless...