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OK, how about this:
button is tight-passive 24/7.
Party Poker 1/2 Hold'em (6 max, 5 handed)
converter
Preflop: Hero is SB with T[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img].
UTG calls, <font color="#666666">
1 fold</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">
1 fold</font>, UTG calls, <font color="#CC3333">Button caps</font>, Hero calls, UTG calls.
Flop: (13 SB) 4[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG checks, <font color="#CC3333">Button bets</font>, <font color="#CC3333">Hero raises</font>, UTG calls, Button calls.
Turn: (9.50 BB) 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, <font color="#CC3333">Button raises</font>, Hero calls, UTG calls.
should I fold here?
River: (15.50 BB) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG checks, <font color="#CC3333">Button bets</font>, Hero calls, UTG folds.
Final Pot: 17.50 BB
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Maybe you should, but you want to be pretty sure of your read. How many hands is your read over? Whats his post flop agression levels? Have you seen him bluf at all? If you are damn sure he is passive, I would fold (or at least I think you should fold, I don't know if I could follow through).