So with a BTN limp and a passive BB with no ante you are calling .5 to win (1+.5 + 1), which means you need 20% equity. Any two cards have enough equity to limp from the SB vs a wide BTN limp. However we are also interested in post flop playability. If it is a passive table guaranteed to check down if everyone misses and only bet when they hit, then you can play any two cards still.
If they will bluff post flop, you need a tighter preflop limping range since you won't realize the equity of your weaker hands. Also your defending skills are important - if you defend vs postflop aggression mostly via calls - then you need a tighter range. If you know how to defend vs postflop aggression with raising some speculative hands at the correct frequency - then you can play more speculative hands. (Since SB limp w passive BB will always be MW we should defend less post flop, since the defense is split between the other player in the pot).
For your 10:1 - that means 3 players limped in ahead of you. So you only need to defend postflop 1/4 of the time you would if heads up.
Also important is can you get away from a hand that is beat - if your 72o flops two pair, and is facing a lot of aggression on a straight, flush, or pair board - then it is probably a hand to be layed down. So if you will call off too light, play tighter preflop to avoid donking off your stack by being too stubborn with a weak two pair.
So passive limps w passive BB, and everyone passive post flop - can play 100%
passive limps w passive BB, limited bluffing post flop, can defend OK - say 60% of hands
if they are more aggression post flop, then play tighter still.
If you are splitting your range (you raise some hands rather than always limp) you have to worry about limp/reraise trappers.
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