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IF I think that CO and or UTG calls me here oftentimes with hands worse than JJ then I 3bet.

If I think CO and UTG are tight enough to fold to a 3bet here then I 3bet.

I I know *nothing* about either player i) I tend not to sit at the table in the first place when I can mine 30 hands simply and have some idea of their playing styles before I sit. ii) err on the side of caution until I have a few postflop reads.

Yes JJ is a strong hand - but ALWAYS doing x in any given situation is a leak.

See AMA's "JJ from the SB" monster thread from last week for a range of opinions on that from a few respected SSNLers.