ipoker,dont know how to convert
6hands
hero j :spade:k 
BB
utg raises, SB calls,hero calls
flop 6 :club:3 :diamond:9 
utg bets,SB calls,hero folds
utg is loose and passive,SB is reasonable
the board is so bad,and utg`range is too strong,is this a weak fold?
if utg is unkown and handup situation,is there any value to peel this flop
nono it's not weak. especially when you tell that utg is passive he could sometimes just check with Ax and against his KJ you are very often dominated by JJ+ AK AJ etc and you just have a almost worhtless backdoor straightdraw that counts 0,5 Outs but with no backdoor flushdraw its not worth calling the flop on your outs. you'll be always behind against Ax or a pocketpair and you don't have more than 4 outs which requires 1:11 to be a call but on the flop you just get around 1:9 on your call. fold flop is fine but call if the board includes a backdoor flushdraw like 6♠9♦3♥
