World championship quarter-final coverage continues live from Sheffield's Crucible Theatre. Last year's surprise finalist, Graeme Dott achieved a comfortable 13-7 quarter-final victory over David Gray. Although Dott built up a 11-5 lead in the first two sessions, he was far from convincing when play resumed. But the number 13 seed held his nerve to win a place in the semi-final against Matthew Stevens. With Hazel Irvine, Steve Davis and John Parrott. BBCi: digital viewers can access additional live coverage of both tables, plus a news and statistics service, via the red button