UTG is 15/8 after 60 hands. Ive been playing with him an hour and haven't seen him get out of line at all.

Button is 79/14 megawhale, and the reason I call preflop.

Hero is 23/20, haven't shown down anything particularly crazy so far.

PokerStars No-Limit Hold'em, €0.02 BB (6 handed) - PokerStars Converter Tool from http://www.flopturnriver.com
MP (€2.61)
CO (€2)
Button (€1.76)
Hero (SB) (€2.05)
BB (€1.56)
UTG (€1.97)
Preflop: Hero is SB with ,
UTG bets €0.08, 2 folds, Button calls €0.08, Hero calls €0.07, 1 fold
Flop: (€0.26) , , (3 players)
Hero checks, UTG checks, Button checks
Turn: (€0.26) (3 players)
Hero bets €0.16, UTG raises to €0.44





What range can he legitimately check the flop 3 way, and then raise an offsuit 6 on the turn?