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I have a pretty small sample, only 75000 hands and 25000 of that is short handed but I have had some success with these hands from early position. Most of these hands are from 15/30 and 30/60 and I pretty much limp with them all. Using OP's starting hand minus A7s. So with A9s, A8s, KTs, QTs, and TJs I have made

UTG - <font color="red"> $178 </font>
UTG+1- $1577
UTG+2- $1543
UTG+3- <font color="red"> $82 </font>

For an overall profit of $2860 or $12.27 per hand. I think you are giving up too much by folding these hands especially if you have a limper. I don't see why you should be so worried about being isolated by an aggressive player and having to fold the flop when you miss. Chances are he's not isolating you with less than K high so he has you beat. I remember playing in a game once where everybody was playing tight and aggressive preflop, mostly just blind steals. I got QTs or TJs UTG and limped. Five or six players limped in behind me. There was some pretty heavy action that hand and a big pot was created. After that hand the table loosened up considerably and there was a lot more limping, it could have been partly due to tilt or maybe it was just coincidence and everybody now has lots of limping hands but I like to think I coaxed these bad players into it by showing them its OK to limp.

Anyway, I see in your post that you know you may be giving up some profit by not playing these hands so do want you want I just thought I would share some results. I would be interested in seeing some other players results that have much larger databases than I do.

regards

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Roy, thanx for your imput. I suspect I may indeed be giving up some profits here. I will say that once one person limps in I will also limp in with all the hands the OP mentioned with the exception of A7s. I prefer 2 limpers with this hand(dont ask me why cuz I dont have a logical reason, this is just my default multi-table online strategy) But I will say that I do not like the Idea of open raising any of these hands from MP1, with no reads on the table, but I will open raise with most of them from MP2. I think the major theme of this thread is that there is a huge difference between MP1 and MP2, and I strongly agree with this view point.