Live $200 buy in on Vegas strip. Blinds 400/800/75. Hero’s stack 12K Villain 40K.

Villain is a regular. He’s a retired guy, generally a big fish, playing too many hands. I’d estimate probably 40-60% of pots. His main weakness is inability to fold. He limps fairly often and raises a little less frequently. He rarely limp/folds and very unlikely to fold to a 3-bet after he opens. I would assume his raining range is generally stronger than his limping range, so maybe top 15% of hands. 

Pre-flop villain min-raised to 1600 MP1. Action folded to hero on the button with A3. 

With 15 BB, against many villains this seems like a good spot for a 3-bet shove. I have the ace blocker flush and wheel backup so I’m not in terrible shape when called. However, I expect to have very little fold equity, so I could get calls from weak dominated aces and small pairs where I have 25-30% equity that other players might fold. 

Folding is defensible given that villain probably has a better than average hand (for him), my hand is good but not great and I don’t have much of a stack to leverage the position or skill advantage.

In general, I don’t like flatting any raise with only 15 BB but I have position, and will have slightly more fold equity after the flop and can give up if the board is very unfavorable. If I call and whiff the flop I still have 13 BB left, enough to make most opponents think twice before calling a shove.

How would you decide between shove, fold or call in this spot?  If it’s defensible to flat with A3s, what other hands would be in a calling range?