[mpitts]

[ QUOTE ]
I'd call the turn and open push the river. One or both have a 7...and they aren't folding. Checkraising the turn might make them suspicious so I just let the pot get big, then get it in on the river....i'm not sure a single card in the deck can hurt you here on the river.

[/ QUOTE ]

I like this play the best. Chances are you have at least one person with a 7 and I would guess that MP1 may have made a straight on the turn and is trying to trap on the river.

Hopefully MP1 did hit a straight (or an under-full) and will lead out. If he does check, lead out on the river with a ~$45 bet and hope they move in on you.