Reddit reviews The Fielding Bible--Volume III

On a side note I think WAR treats first basemen unfairly as they are important in saving bad throws from the other infielders.

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If you are implying that WAR does not take saving bad throws into consideration, it does: dWAR is an extremely sophisticated measure, that accounts for over 80 types of plays...one of them, of course, is catching balls in the dirt. From the infield, from the outfield, whether you're a catcher, first baseman, or any other fielder. I guess outfielders almost never have to do that, but sometimes they drift into the infield, and when they do, it is accounted for. EVERYTHING is accounted for. There's a whole book on how it works: https://www.amazon.com/The-Fielding-Bible-Volume-John-Dewan/dp/0879464763

P.S. Don't know how this applies to historical numbers (frankly, I don't care, I'm only interested in current stats), but I'm sure they're doing things to account for good fielding at first. Maybe someone knows?

Another important note: no, I have not read that book. I'm not completely insane, my obsession with baseball stats has limits. Just saying, there's a book.