(16) HU against a reg w/ suspicious limp

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PokerStars Tournament, Big Blind is t600 with t50 antes (2 handed) Converter on pregopoker.com

Button (t9075)
Hero (t4425)

Preflop: Hero is in BB with 7[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/heart.gif[/img]
Button calls t300, Hero checks

Flop: (t1300) Q[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] (2 players)
Hero checks, <font color="red">Button bets t1200</font>, <font color="red">Hero?

I was playing on my friends account when this happened, so he doesn't know it's me he's playing against. The reg is solid.