23:20Snooker: World Championship Highlights2011Day 13BBC Two Duration: 50 minutes Thu 28th Apr 2011, 23:20 on BBC Two EnglandHighlights of the opening sessions of the best-of-33 frame semi-finals.ContributorsPresenter:Rishi PersadCommentator:Dennis TaylorCommentator:Willie ThorneCommentator:John VirgoGenresSportSnookerBrandSnooker: World Championship HighlightsSeriesSnooker: World Championship Highlights: 2011 Source: BBC Online