[J.R.]

It called sweeping breaking balls which caught a piece of the front of the plate strikes even though the pitches landed well off the plate, creating the impression that the system was nuts when in fact it was the umpires who turned out to be mistaken. Along these lines, it didn't reward pitchers who could consistently throw pitches off the corner of the plate by "extending" the strike zone, raising the ire of pitchers like schilling.