Create chess opening book files to be read with obooksrv (see https://github.com/gkalab/obooksrv).
obookmkr is based on Polyglot 1.4, by Fabien Letouzey. The only change is the output format of the created opening books.
The difference to the Polyglot format is as follows:
key uint64
move uint16
weight uint16
learn uint32
key uint64
move uint16
wins uint8 // percentage of wins (0..100) for white in the given position
draws uint8 // percentage of draws (o..100) in the given position
n uint32 // number of games for the given position
Thus, the created books by obooksrv are not compatible with the Polyglot format.