Chess -- Vat.lat.5854

Games: Chess (Facsimile)
Sources:
An apparently-anonymous (?), but large and interesting manuscript, full of what appear to be chess problems. The hand isn't the easiest to read, but appears to be Latin, and there is a lot of it.
Any additional info on this book would be welcomed -- I can't find much about it.
The first half of the book appears to be chess positions contained inside of a grid border. There appears to be some sort of graphical notation encoded in the markings on the border, but damned if I have any clue what it means.
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