UPDATE PM: With the Nielsen nationals in, The Stanley Cup Final Game 6 is officially the most-watched and highest-rated NHL Game in 36 years. It was watched by 8.3 million viewers and drew a 3.2/10 in adults 18-49. The four final games broadcast by NBC this year averaged 6.1 million viewers, the best network-TV series average in 13 years. The hockey game was the highest-rated program last night, edging out Fox’s So You Think You Can Dance (3.0/9). rocky-trophy-bc

PREVIOUS 8:30AM: Last night’s series-clinching Game 6 of the 2010 Stanley Cup Final between the Chicago Blackhawks and Philadelphia Flyers posted a 5.8/10 overnight rating, the best overnight for any Stanley Cup Final game in 36 years. The Blackhawks defeated the Flyers in overtime to give Chicago its first Stanley Cup since 1961, ending the NHL’s longest championship drought. Last night’s game was up 41% from last year’s Game 6 between the then-defending Stanley Cup champion Detroit Red Wings and the Pittsburgh Penguins.

Fox was the only other alternative for fresh programming on broadcast TV last night. (OK, I stand corrected. ABC aired a new Happy Town at 10 PM, which once again was the lowest-rated program of the night by a wide margin, drawing a 0.8 rating/2 share in adults 18-49.)

The two-hour broadcast of Fox’s So You Think You Can Dance averaged a 3.0/9 in the 18-49 demo, up +7% from last week’s Wednesday show. Beyond that, it was all repeats on the other nets, with no show able to crack a 2 rating in 18-49.