Last Change: 2018-09-07, 16:50
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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 probabilities looking at each side independently.
Bearoff databases can get quite large and can take a significant amount of time to generate 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 database 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 gnubg_ts.bd
Note that this database is 72MB in size. To generate a one-sided database for up to fifteen chequers on ten points:
makebearoff −o 10 −f gnubg_os.bd
Note that this database is 118MB in size.
Joseph Heled, Øystein Johansen, Jørn Thyssen, and Gary Wong, with the assistance of many others <bug−gnubg AT gnu DOT org>.
This manual page was written by Russ Allbery <rra AT debian DOT org>, 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).