15:30Snooker: World Championship200828/04/2008 Part 1BBC Two Duration: 1 hour Mon 28th Apr 2008, 15:30 on BBC Two Northern Ireland (Analogue)Hazel Irvine introduces continued coverage from Sheffield as players vie for quarter final places. Ronnie O'Sullivan v Mark Williams and Neil Robertson v Stephen Maguire.ContributorsPresenter:Hazel IrvineCommentator:Dennis TaylorCommentator:John VirgoCommentator:Willie ThorneCommentator:Terry GriffithsCommentator:Neal FouldsGenresSportSnookerBrandSnooker: World ChampionshipSeriesSnooker: World Championship: 2008 Source: BBC Online