Here's the tale of the tape from the Packers' 21-14 win over Chicago on Sunday:

Psycho killer

The newly unveiled "psycho" defense is unique because it puts five linebackers in the nickel package, but its most dangerous member might be the lone lineman, DE Cullen Jenkins.

Because it's more difficult for the offensive line to sort moving players before the snap, Jenkins more often than not will end up isolated on a pass play. So, depending where he's aligned, Jenkins practically can have his pick of the most favorable one-on-one matchup.

Against the Bears, that matchup was with protection-challenged LG Frank Omiyale.

On the first "psycho" snap, Jenkins lined up in a two-point stance over Omiyale, who was kicking out on a counter run. Jenkins easily blasted between LT Chris Williams and pulling RG Roberto Garza to smash RB Matt Forte for a 3-yard loss.

On the second, Jenkins beat Omiyale outside, forcing him to take a holding penalty that wiped out QB Jay Cutler's 21-yard scramble. The ensuing third-and-21 was a screen pass for Forte, and Jenkins' rip move on Omiyale put him in the backfield so fast -- even if the guard is getting out, he can't allow unchallenged pressure inside -- Cutler had to float the pass, giving ILB Desmond Bishop an extra second to sniff it and catch Forte from behind.

Another "psycho" snap had Jenkins rushing outside as an effective decoy while overload pressure came from the opposite edge. In all, DC Dom Capers ran "psycho" six times, all on third down, and the Bears converted only one -- a 19-yard strike from Cutler to WR Devin Aromashodu a tick before a trio including Jenkins got home.

The element of surprise was at work in Chicago. Like anything, opposing offenses will find ways to counter the look once they scout it, and the Packers aren't going to start deploying it 30 times a game. But getting impact players in man-on-man situations is any coordinator's goal, and it sure seems "psycho" can do that for Jenkins.

Seeing red

Consecutive first-half possessions that netted only a pair of field goals followed the pattern of red-zone struggles the Packers offense has endured the past month.

The Packers struggled all day on third down (5 of 13, 38 percent), but more troubling is the way things seem to keep going off the rails on second.

The first sequence was on schedule before RE Alex Brown batted a second-down option slant for WR Jordy Nelson. The play was blocked as a shotgun draw to RB Ryan Grant -- who had a hole, TE Spencer Havner leading and only SS Kevin Payne to beat to the goal line -- but QB Aaron Rodgers spotted CB Zackary Bowman giving Nelson a 4-yard cushion on the edge and decided to throw. It wasn't a bad decision per se, but it backfired.

That set up a mess on third-and-7 that ended with WLB Lance Briggs sacking Rodgers. LE Adewale Ogunleye got the initial pressure off the edge against RT Mark Tauscher, forcing Rodgers to step up, and RG Josh Sitton hung with a stunt a little too long as Briggs whizzed past him on a delayed blitz. There also was a route issue in the end zone and RB Brandon Jackson never got out on his check-down route.

The next drive fizzled after Tauscher's false start offset a 5-yard first-down by Grant. Brown read a screen to TE Donald Lee all the way on second-and-10, and Rodgers misfired low on a third-down throw for WR Donald Driver in the end zone. It was a tight window on the skinny post between Briggs and FS Al Afalava, but it's also a throw Rodgers can make.

The Packers finished 1-for-4 in the red zone, although that included the final kneel-down sequence. Still, their 8-of-19 showing (42.1 percent) over the past four games has to be disturbing. Only two teams, Buffalo and St. Louis, entered the week below 42 percent for the season, and that's not company the Packers want to keep.

Playmakers

* Payne probably could have taken a better angle and who knows where SS Josh Bullocks was going, but Grant deserved his 62-yard TD run for how decisive and physical he was all day against persistent eight-man boxes. The Packers went back to the same play in the fourth quarter and Grant turned the corner for 17, plus 15 more on a late hit. It appeared it was called a third time, too, but Rodgers threw the backside option to WR Greg Jennings for 5.

* Take out TE Jermichael Finley's careless fumble late in the first half, and he had another sensational day, with team highs in targets (seven), catches (five) and receiving yards (70). The highlight was a 25-yard strike from the right slot after Finley emasculated CB Nathan Vasher's jam. The Bears' best defense against him was to manhandle him to the ground -- as Payne did on one third down and somehow didn't draw a flag.

* DL B.J. Raji started fast and flashed glimpses of the future in his first extensive action at nose tackle in place of Ryan Pickett (hamstring). Raji did have some technical errors and ended up on the ground a couple times in the third quarter. But in 26 snaps, mostly in base, Raji held his own against C Olin Kreutz and was credited with two solo tackles -- not bad for a guy who hadn't played the position since camp.

* The Bears' offensive line still is going backward from the lick laid by Jenkins, Raji and DE Johnny Jolly on a key third-and-1 stop in the third quarter. SS Atari Bigby cleaned up at the edge for one of his team-high seven solo tackles -- exactly the sort of production for which the Packers have been waiting. Bigby's day would have been even better if he'd held on to a deflection for an interception.

* Like Jenkins, ROLB Clay Matthews is so explosive he can be a nightmare in one-on-one situations. Williams' vicious facemask was the capper on his daylong embarrassment against Matthews, who also got off Williams for a coverage sack, drew another penalty for illegal hands to the face and had three pressures.

* MLB Nick Barnett continues to play at a high level. It doesn't get much better than his read-and-rock screen stop past Kreutz. His blitzing spin on FB Jason McKie forced the flat-footed throw Woodson intercepted early, and his tight coverage on Aromashodu nearly handed Bigby a pick.

Play breakers

* Cutler's two TD passes were more the result of precise back-shoulder throws than coverage mistakes. CB Tramon Williams was in man-under coverage on WR Johnny Knox's 19-yard TD and might have made a play had he gotten his head around sooner. The 10-yard TD to Aromashodu was thrown so far outside -- he made a terrific catch -- there wasn't much CB Charles Woodson could do. Cutler threw at Williams eight times and completed six for 71 yards, the longest a 28-yard comeback to Knox after Williams fell. His biggest contribution was on two blitzes, one that led to FS Nick Collins' interception and another for a sack after ILB Brandon Chillar duped Forte outside. Woodson was targeted six times, should have had three interceptions instead of one and allowed three catches for 41 yards, a quick hitter and two back-shoulder throws on which Soldier Field's terrible turf might have hurt him.

* Footing didn't seem to play a role on PK Mason Crosby's 42-yard field goal miss, which followed a low 26-yarder that could have been blocked. Bottom line: you're an NFL kicker, so you have to make those kicks. RB Brandon Jackson's drop on the previous play didn't help.

* Credit LG Daryn Colledge with a great block on DT Tommie Harris to front Grant's 1-yard TD plunge, but he also had two costly misses. Colledge's finish was poor on the Bears' second sack, by Harris on a stunt that took so long Rodgers probably should have chucked it, and DT Anthony Adams worked Colledge down the line to drop RB Ahman Green for a loss of 1 on a late third-and-1.

* DT Marcus Harrison's rush against Sitton created the initial problem on Rodgers' bizarre double-bobble turnover.

Dot ... dot ... dot ...

Capers blitzed far less than in the teams' first meeting, sending five or more rushers on only 13 of Cutler's 41 dropbacks (31.7 percent). ... With Pickett out and Raji missing a little time with a shoulder stinger, DE Jarius Wynn (11 snaps) saw his most extensive action on defense. The rookie sixth-round pick didn't make any plays but wasn't a liability either. ... Jolly (52 snaps) battled through a knee sprain and had one of his better games. But he cost himself a key fourth-quarter sack by not being disciplined enough to keep his hands off Cutler's facemask. ... ... LOLB Brad Jones (44 snaps) had more glitches than in three previous starts as the Bears challenged him in both phases. Brady Poppinga (11) also rotated in and didn't do much of anything. ... Chillar played a dozen snaps, including the final three in Hawk's place in nickel.