I got an email this week telling me that some pitchers in Baseball Mogul 2021 were losing one or more of their pitches in the off-season. For example, if you start in 1998, Jeff Suppan has 5 pitches. But then this happens at the beginning of 2002:
His cutter disappears, his sinker becomes a slider, and his "four-seamer" becomes a generic "fastball". It turns out that this bug is a side effect of the way we collected pitch data over the years.
In 2016, we added a file called PItch_Type_Frequency.csv, with pitchF/X data going back to the 2002 season. Now, instead of hand-editing each new pitcher's repertoire, I could just update one file. And because I viewed actual pitchF/X data as "better" than the hand-edited file, I told Baseball Mogul to overwrite the data in PitchRatings.csv with data from Pitch_Type_Frequency.csv whenever possible. And this is how Jeff Suppan's pitch repertoire got f---ed up between the 2001 and 2002 season.
It turns out that the hand-edited data had some advantages, such as including 37 different pitch types instead of the 7 tracked by pitchF/X. So I fixed this problem in Version 24.11 by telling Baseball Mogul to prioritize data from the hand-edited file when possible — and to not overwrite a pitcher's pitch repertoire in the middle of their career.