Low card board like this is good for BB's range, he gets to call pre with alot of junk that would connect with this board. I might prefer checking flop as Hero here because of the board texture. BB gets to check-raise on these types of flops I believe because they can have all of the odd ball hands like 96s,64s, or 85s,75s because of the price they were laid pre. When they have more nut hands in their range they can get away with check-raising in these spots with a polarized range of their best made hands and some bluffs like the many 6x they could have possibly all T9 combos etc.
On the turn Hero is getting over 3:1 on a call, so we need to have around 25% equity. Idk anything about villain but the MDF on the turn is 72% of our range, if he is ever bluffing I might call with K8 here and see a river assuming he could be bluffing with all his gutshots, 6x and T9 type hands, turn also brings diamond draws to alot of suited hands he could have that would pickup equity and help with his semi-bluffs.
