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 . 
How did Sakuni survive the prison?
The prisoners pooled together the food that had been given and chose Sakuni to recieve it. Duryodhana then felt pity on Sakuni after the rest of the prisoners died