2/4 B&M - flopped set pedal to the metal

[threeducks]

The river bet is a bit scary since 45 would check and call I think. If he put you on 2 pair or a set you now most likely have a FH if not your are not calling with less. I think he most likely has FH, 7's full.

Riddle: What hand does the SB check raise the flop with, 3-bet the turn and lead the river with?

Check raise flop with 45? Maybe but not likely.
Check raise flop with 66, 88-JJ, maybe but then 3-bet the turn? no

Back to full house, hopefully 22.