http://weaktight.com/6100613

UTG: 24/19 over 21 hands

When He checks the turn, I guess He just gives up the party. His range weigted toward total airs, however He could've a few pocket pairs.

River: If His range rather contains total air on the turn, He might try to take it down in this scarry river.However He hits the set hardly ever with 4s.

Should I check/call, or just check/muck against an unknown in this type of runout.