Preflop: Standard ISO vs 86% VPIP (CO) and Reg (27/19/4.5) who overlimps. My hands plays well postflop and has an equity edge.
Flop: I decided to pot the flop for a few reasons: CO is not folding anything decent on the flop (Set, 2-Pair, Flush Draw), by potting he might be more inclined to shove, which forces out BTN with draws and we can get the money in. Even if CO calls, we can shove non-spade turns comfortably, given the low SPR.
I think check/raising is okay, but many middling strong hands will check/behind, especially in CO shoes as he is so passive.
Facing flop raise from BTN: My assumption was the BTN will stack-off here 100%. If he had a naked straight I thought he will just pot to protect his hand. A small raise size is usually indicative of a strong hand that dominates other hands (such as set+nutflush draw or similar).
So vs. raise I am thinking my hand is not a huge favorite against the range I am facing. By flatting the raise we can wait for clean turns and then openjam, otherwise check/fold on a spade turn.
It turns out BTN had a low straight with two pair. A much weaker hand than I thought. Flatting and seeing a turn would have stalled the action and cost me another 50 big blinds. So I am curious, would you have played this differently?