00:10World Championship Snooker Extra2013Day 12BBC Two Duration: 2 hours Thu 2nd May 2013, 00:10 on BBC Two EnglandHighlights from the quarter-finals in Sheffield.ContributorsParticipant:Steve DavisParticipant:Ken DohertyParticipant:John ParrottParticipant:Stephen HendryParticipant:Terry GriffithsParticipant:Dennis TaylorParticipant:Willie ThorneParticipant:John VirgoExecutive Producer:Alison WitkoverExecutive Producer:Graham FryGenresSportSnookerBrandWorld Championship Snooker ExtraSeriesWorld Championship Snooker Extra: 2013 Source: BBC Online