MAKEBEAROFF(6) - Linux man page online | Games

Generate a GNU Backgammon bearoff database.



makebearoff - generate a GNU Backgammon bearoff database


makebearoff [-HCcgnvh] -f filename [-t PxC] [-o P] [-s cache-size] [-O filename]


makebearoff generates GNU Backgammon bearoff databases, which are used to improve play in the endgame. It can generate either two-sided (exact) databases that tell precisely the chance of winning or one-sided (approximate) databases that provide a variety of probabil‐ ities looking at each side independently. Bearoff databases can get quite large and can take a significant amount of time to gener‐ ate for large numbers of chequers and/or points.


-f filename, --outfile filename Write the bearoff database to filename. This option must be given. -t PxC, --two-sided PxC Generate a two-sided bearoff database for P points and C chequers for each player. Be warned that the size of the database grows rapidly with larger numbers of points and chequers. -o P, --one-sided P Generate a one-sided bearoff database for P points. One-sided bearoff databases are always generated for up to fifteen chequers. -s N, --xhash-size N Use a memory cache of size N while building the database. If the cache is smaller than the database size, database generation will be slower due to disk writes. -O filename, --old-bearoff filename Reuse an already generated bearoff database. Any needed data already in this data‐ base will just be copied without regenerating it. -H, --no-header Do not write the normal bearoff database header. -C, --no-cubeful Do not calculate cubeful equities for two-sided databases. -c, --no-compress Do not compress one-sided databases. -g, --no-gammons Do not include gammon distributions in one-sided databases. -n, --normal-dist Rather than storing exact probabilities, approximate probabilities in a one-sided database with a normal distribution. -v, --version Show version information and exit. -h, --help Display usage and exit.


To generate a two-sided database for up to eight chequers on six points: makebearoff -t 6x8 -f Note that this database is 72MB in size. To generate a one-sided database for up to fif‐ teen chequers on ten points: makebearoff -o 10 -f Note that this database is 118MB in size.


gnubg(6), bearoffdump(6)


Joseph Heled, Øystein Johansen, Jørn Thyssen, and Gary Wong, with the assistance of many others <>. This manual page was written by Russ Allbery <>, for the Debian GNU/Linux system (but may be used by others). It may be redistributed and/or modified under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation (the same license as GNU Backgammon).
2006-01-15 MAKEBEAROFF(6)
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