compuease;374462 wroteI am assuming 20BB effective... You have 16K and are covered by villain?
Preflop pot is approx. 3600 (4 limpers plus SB). Post flop, UTG+1 bets 1800, UTG+2 raises 4.5K which means pot is now 11.7K (3600+1800+1800+4500).
You have 15.2K left which means when you shove it means that UTG+2 only has to call 8.9K more to win 20.6K, ie he is getting better than 2-1. Unless he is bluffing he is not folding so little fold equity...
You therefore have to end up with the best hand, ie make the flush.. Depending on whether or not he has a Q without an A it means you are between 36 and 45% to win. With little fold equity this is pretty thin...
Unless you think there is a reasonable chance UTG+2 folds, I fold, you are only in for 1BB. Now if you have A,2 of clubs, different story. That may be enough to make the difference...
I agree with the great analysis of comp, this is very thin, usually people jam the nut-flush draw (36%) since we also have fold equity that covers the 14%, if people call 100% of the time its never profitable to jam flush draws.
Your A is good most of the time the way the hand was played but unfortunately he had your A crushed.
I think this depends on weather you want to gamble your stack or not, If i was the shortest stack i would jam here since there isn't any ICM factors but if there were 2-3 people with 10bbs i would fold. After-all 20bbs is a stack that still has room to play with.
If you double up to 40bbs where does it put you in chips? 1st,2nd?
I Think calling or folding are both justified in this spot and its pretty close.