makebearoff6
Generate a gnu backgammon bearoff database
Usage
makebearoff [-HCcgnh]
-f
filename
[-t
PxC]
[-o
P]
[-s
cache-size]
[-O
filename]
Overview
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.
Options
-
-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.
-
-h, --help -
Display usage and exit.
Examples
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.
Releases
10 releases since Debian 4.0 (Etch); the text changed 1 time.
--version until Debian 12 (Bookworm);
-v until Debian 12 (Bookworm).