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Is there any reason (read: advantage) for sitting with 50BB as opposed to the 25 that Partypoker picks by default when you pick a seat?

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Buying in short/big at limit is a debatable advantage/disadvantage at best. Only at the extremes does it seem to affect your tablemates' behavior: a 200 BB stack might cause some opponents to tighten up against you, and a 10 BB stack might cause them to play you more aggressively.

At Party I usually just do the default 25 BB, and rebuy in the rare event that I get down to 12 BB.

The default amount varies between sites - at Stars the default it's unrealistically low (10 BB, I think) for some reason, and at UB it's 50 BB.

(Edit in bold) [img]/images/graemlins/grin.gif[/img]