12:30Snooker: World Championship2011Day 11, Part 1BBC Two Duration: 4 hours, 45 minutes Tue 26th Apr 2011, 12:30 on BBC Two Northern IrelandAll eight quarter-finalists are in action on day 11 of the World Championship in Sheffield. Matches are the best-of-25 frames and are played over a maximum of three sessions.ContributorsPresenter:Rishi PersadParticipant:Steve DavisParticipant:Ken DohertyParticipant:John ParrottCommentator:Neal FouldsCommentator:Terry GriffithsCommentator:Dennis TaylorCommentator:Willie ThorneCommentator:John VirgoGenresSportSnookerBrandSnooker: World ChampionshipSeriesSnooker: World Championship: 2011 Source: BBC Online