For 10-year-old Phiona Mutesi (Nalwanga) and her family, life in the impoverished slum of Katwe in Kampala, Uganda, is a constant struggle. Her mother, Harriet (Nyong'o), is fiercely determined to take care of her family and works tirelessly selling vegetables in the market to make sure her children are fed and have a roof over their heads. When Phiona meets Robert Katende (Oyelowo), a soccer player turned missionary who teaches local children chess,...