I generally play NLHE STT and MTT, $5 to $30.
I'm generally cautious with someone who I haven't seen limp before who suddenly does limp.
For the infrequent limper, especially UTG or UTG+1, I usually assume their range is AQ up and 88 up (the lower the buyin, the wider the range - AT seems popular at the lower end of my buyin range). If the limper is first to act and in mid to late position, I assume their range is somewhere around 87s up to AJo, and any pocket pair up to TT (better hands would mostly be raised rather than limped in mid to late position).
Against the early position infrequent limper, my hands requirements increase to roughly the same range I'm assigning them - if I think I'm above 50% of that range , I'm generally raising, otherwise I'm looking for a favorable flop and the limper's actions on the flop. Against the mid to late position infrequent limper, if I have position, I'm using a similar range to what I think they're range is, but including a lot of suited connectors - if I'm out of position (blinds), my range is generally tighter than the range I'm putting them on (I want AT, bigger suited connectors, 88). I'm more likely to flat call a mid to late position limper, but still raising with premium hands. This generally holds true for me from level 3 or 4 up to around level 7 or 8, assuming my stack is healthy.
I tend to increase the number of starting hands I'll play behind players who I see limping frequently, or behind multiple limpers, rather than tighten up. I'll limp more suited connectors and pocket pairs behind than I normally do, and even non-suited connectors that I'd otherwise stay away from (say 65o). When I get hands that I consider stealing raising hands preflop - say 87s up to QJs, or 66 up to 88 - I'm more likely to raise a single frequent limper, though almost always flat calling multiple limpers.
I'm looking for implied odds
with frequent limpers, looking for bigger payoffs when I connect with the flop. Multiple limpers are very attractive here, particularly in the third through fifth levels of the tourney. Obviously I'm leaking chips when I miss, but when I hit I can frequently build my stack quickly - and my legitimate raising hands get less respect when I show down one of these hands, leading to bigger payoffs with those real hands.
I'm avoiding confrontations with early position limpers, unless I have a quality hand. How the flop hits me is more important than with mid and late position limpers.
What's your strategy with the limper? What do you think of the above? What ways are there to evaluate these strategies with pokertracker, pokerstove, or other tools?