CBS doesn't really need to make many changes to its schedule, given that it's TV's No. 1 network by a mile (or three). But the TV gods demand at least minor tweaks at midseason, and so the Eye has now complied, announcing some shuffling late today. The most interesting move? New half-hour comedy Mad Love — starring the awesome Judy Greer and Sarah Chalke, along with Jason Biggs — is getting the plum 8:30 p.m. Monday time slot behind How I Met Your Mother, starting February 21. Rules of Engagement will shift to 8:30 p.m. Thursdays on February 24, mercifully ending the shortened first-season run of @#*! My Dad Says. Meanwhile, CBS has pretty much given up on The Defenders: The Jim Belushi legal dramedy will give up its 10 p.m. Wednesday slot and move to the death zone known as 8 p.m. Fridays on February 4, replacing the canceled Medium. Then, on April 1, CBS will take The Defenders off the air altogether and fill its Friday time slot with the new CIA drama Chaos. So what's taking over for Defenders on Wednesdays at 10? For four weeks (starting January 19) CBS will test out Tom Selleck's Blue Bloods in the time period; then, on February 16, spinoff Criminal Minds: Suspect Behavior takes over the slot.