Shakuni plots Yudhishthir's fall

Arjun seeks Dronacharya's blessings. Bheem takes on Ashwatthama to save Prativindhya. Yudhishthir finds himself isolated on the battlefield. Bhishma asks Duryodhan to take the opportunity and capture Yudhishthir. How will the Pandava brothers save Yudhishthir?