Nair says she first came to know about chess genius Phiona Mutesi's story from Tendo Nagenda, the Executive Vice President of Production, Disney.
An Ugandan, Nagenda visited Nair at her home in Kampala and over 'chai and samosas' asked her whether she was interested in directing it.
"He gave me a half page article about Fionna, who was 11-year-old, lived 15-minutes away from my house. She was off to a Russian chess championship and was completely illiterate. I was immediately interested," Nair told PTI in an interview over phone from New York.
The director says she has not tried to sugarcoat anything as she wanted to be honest to Phiona's story.
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"It not just brings a positive image of the African continent but is also something that is an honest and truthful portrait of ordinary people. It it a purely African story and is told without any sugarcoating. Disney respected my vocabulary and sensibility as a filmmaker."
"Did you know Lupita was my assistant on 'Namesake'? She is like a daughter to me. And then she became a huge star. She is a great actor and also from the continent and so is David. He is a Nigerian. It is an extraordinary time where we can make a major Hollywood movie with two Hollywood stars and tell the story truthfully."
Nair says Nyong'o, who plays Phiona's mother Harriet Nakku, agreed to do the film within five hours and Oyelowo, in the role of Phiona's teacher Robert Katende, was similarly moved.
"The remarkable thing about Harriet is her courage and dignity and that's how I think of Lupita. She has this massive core strength and dignity. In David's case, I have chased his work for many years. He is an amazing actor and looks uncannily like Robert."
The director says Lupita called her and said she was "shaking and crying" when she read the first 10 pages of the script while Nair's 1991 film "Mississippi Masala" was one of the formative experiences for Oyelowo.