The opening shot of the movie shows Kunti praying for Lord Krishna's protection for the Pandavas .  Lord Krishna consoles Kunti and promises to ever protect the Pandavas and guide them through troubles and problems that may occur in life .  The sons of Pandu and Dhritarashtra progeny break into an argument .  When Duryodhana insults the Pandavas as `` dependents '' , Bheema counters by saying that , the Kauravas are the progeny of a widow .  Duryodhana asks Veda Vyasa for an explanation .  He is then told that , since his mother , Gandhari had an astrological defect , she is first married of to a goat and then married to his father .  Duryodhana gains animosity towards the kingdom of Gandhara where the king , the father of his mother Gandhari , rules .  He attacks Gandhara and lays waste of the whole kingdom .  He them imprisons the royal family in his prison .  He gives them only one rice grain per prisoner .  The king of Gandhara then stops everyone from grabbing the little food that is provided .  He says that instead of everyone dying , they could keep at least one of their princes alive .  He chooses Sakuni to be alive .  Sakuni takes an oath that he will do everything he can to destroy the entire Kaurava clan .  He makes magic dice from his father's spinal cord .  The magic dice show exactly the number that he would want .  Duryodhana takes pity on the lone prisoner , Sakuni after the rest of the Gandhara royal family dies in prison out of starvation .  Sakuni joins the evil of coterie of Duryodhana , Karna and Dushyasana . 
Which prince do the king of Gandhara choose to keep and not die?
He joins the evil forces