Via Kevin Dame, he's a graphical look at the pitches Chris Carpenter threw this season, and how well he threw them:
Carpenter throws a lot of fastballs -- as most pitchers do -- but it's not a particularly effective pitch for him, or at least it hasn't been this season. He mixes in some curveballs -- which essentially serves as his change-up, since he throws so few of those that they don't show up here -- but those haven't been that good this season, either.
Carpenter's slider, though? He throws his slider roughly a fourth of the time, and it's been his best pitch this season. In fact, by this measure Carpenter threw the fifth-most effective slider in the National League this season. So while you're watching Game 3 Wednesday night, watch for Carpenter setting up that slider with his fastball and curve.
Chris Carpenter has been around for a while, and between the injuries and the natural adjustments that pitchers make during their careers, he's made some changes since reaching the majors way back in 1997. Don't believe me, though; here's Diamond Dan Plesac with the visuals: