Villian is not a regular, but is multi tabling right now. He seems very good so far. He is not giving anything up out of position so far. We both built our stacks before it got heads up. So far nothing exciting has happend in the HU match (which means we are probably both playing well).

Pokerhand.org is telling me its not a valid HH for whatever reason so bare with me.

PokerStars Game #9919399036: Hold'em No Limit ($2/$4) - 2007/05/15 - 00:58:43 (ET)
Table 'Giacobini' 6-max Seat #6 is the button
Seat 1: molswi47 ($1008.05 in chips)
Seat 6: Xaston ($1303.80 in chips)
Xaston: posts small blind $2
molswi47: posts big blind $4
*** HOLE CARDS ***
Dealt to Xaston [6d 7s]
Xaston: raises $8 to $12
molswi47: raises $36 to $48
Xaston: calls $36
*** FLOP *** [3c Kd 6h]
molswi47: bets $51
Xaston: calls $51
*** TURN *** [3c Kd 6h]
molswi47: checks
Xaston: bets $136
molswi47: raises $252 to $388
Xaston: raises $816.80 to $1204.80 and is all-in

With a slow dynamic it's close. For 200BB it's an easy call (getting 1:4), for 300BB it looks like a fold, 250BB I am not sure. Still, IMO it's not a good spot to bluff if you put him on AK+ and want to make him fold AK. It's like trying to make people fold AA in 6max, not a good idea.