Chinese chess grandmaster and three-time women's World Chess Champion, Hou Yifan, opens a chess tournament at a subway station in Mexico City, on Sunday, June 25, 2017. Photo: AFP
People take part in a chess tournament at a subway station in Mexico City, inaugurated by Chinese chess grandmaster and three-time women's World Chess Champion, Hou Yifan, on Sunday, June 25, 2017. Photo: AFP