Dominic Lawson talks to the women's world chess champion Hou Yifan. Still only 19, Yifan is one of only a handful of women to have become an elite grandmaster. Show more
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Dominic Lawson talks to the women's world chess champion Hou Yifan. Still only 19, Yifan is one of only a handful of women to have become an elite grandmaster. Show more