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I feel with big pair, TT ~ KK, if flop comes A, Check raise might be better than C bet.  
 
especially at HU.  since if villain does not have A,  you avoid being bluff 
if does have A, you can force him to fold Ax a lot of time.  
if he raise back, then you can fold comfortably. 
 
if you raise 200 pre and lead 300$ out at flop, that looks pretty weak. because he can easier narrow you down to Pocket pairs after 3 bet. Cause, seldom ppl  3 bet with AQ. or even AK. 
 
Anyway, JJ/QQ play really tricky, and it is easily played as set-mining, which lost value. |   
 
 
 
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