Table just started, this is the 3rd hand, so pretty readless. BTN is like 80 years old and looks like a nit, but not much read on his actual play. $500 effective stacks to start.
A few limpers, I pop it to $35 with KK in MP, BTN calls, SB calls, 3-way to flop.
Flop 6s 4s 3x
SB checks, I bet $70, BTN calls, SB folds.
Turn 2s
Hero ? ?