It was a half-and-half night among the Big 4 in primetime Sunday. CBS and ABC were almost all originals, while NBC and Fox were all encores. For Big Brother (2.1/8), that literally meant a bit of chess match among the usual housemate intrigue. Although the fourth Sunday broadcast of Season 16 of the vet reality show dipped 5% among adults 18-49 from last week, preliminary ratings have BB as the top-rated show of the night and, with 6.38 million tuning in, the night’s second-most-watched show — following the audience of 7.72 million for a repeat of 60 Minutes (0.9/4) that started the night. New episodes of Unforgettable (1.0/3) and freshman Reckless (0.6/2) followed BB to round out the night. Last night saw another double-digit rise for the Poppy Montgomery starrer as it grew 11% from its July 13 show. The latter took an even bigger jump with a 20% rise from last week, when it was flat with the week before. CBS topped the night in18-49 with a 1.1/4 rating and in total viewers with 6.147 million watching.

Even though it was all repeats, Fox was second in ratings (1.0/4) while ABC was No. 2 in viewers with 4.073 million. With a 1.5/5 rating, Fox’s 9 PM Family Guy encore was the night’s second-highest-rated show.

There were more duets on ABC’s Rising Star (1.0/3) last night with a duo getting sent home and four singers moving forward. On the ratings side, the live one-hour high-tech, high-concept competition show was down 23% in the early numbers to a new low. While that could change in the final numbers, that’s got to hurt with all the fireworks ABC has put behind the show and the fact that last week it actually rose for the first time since its June 22 debut to have the best demo result since then. Last night’s Rising Star decline certainly wasn’t helped by lead-in Wipeout (1.0/4) taking a face-plant of its own:After also being up last week, the competition show fell 23% in preliminary numbers from its July 13 episode.