Mikhalchishin: how to beat a World Champion

He has a daunting task: GM Adrian Mikhalchishin coaches WGM Betul Cemre Yildiz, bottom seed at the Women's Grand Prix in Kazan. In round two she faced the reigning women's world champion Hou Yifan, rated almost three hundred points above her, with the black pieces. But Betül managed to trick her Chinese opponent and pull off her first win against her. Mikhalchishin tells us how.