I haven't been posting many hands. This was a sick one from live game.

I open UTG+1 to $15
I have about $550.
Fish calls UTG+2 and has $350
Pretty solid player calls from BB and has about $400 to start hand.

Flop($46):
BB checks, I check, UTG+2 (who has every single Ax combo in range) checks

Turn ($46)
BB checks. Everyone looks really weak here so I bet $25, UTG+2 folds. BB check-raises to $75. I think a bit, check his stack, and he has a bit over $300 left, and I call.

River ($196)
River's a brick and he fires $150.

Think BB is mega-polarized here. He has almost no value hands IMO. He is 3-betting TT/AQ+ pre against me and probably getting it in with all but AQ/JJ/TT.

My hand is ridiculously concealed and is the third nuts so I'm never folding, the question I have is how weak a hand should we call here? Trying to figure out the number of bluffs he can have is pretty difficult.