It was a battle of the reality shows on CBS and Fox Thursday night at 8 00, and it ended in a tie between the season finale of CBS's Big Brother and Fox's So You Think You Can Dance . And it ended with a first-place tie. At 9 00 p.m., however, SYTYCD moved into an undisputed lead as it approached the announcement of the $250,000 prize winner, 18-year-old Lauren Froderman. Actually, the dance contest had the field pretty much all to itself as CBS aired a rerun of CSI, ABC saw its numbers tumble for Rookie Blue, and NBC found few viewers for its regular comedy line-up.