NAME

makebearoff - generate a GNU Backgammon bearoff database

SYNOPSIS

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

DESCRIPTION

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.
-v, --version: Show version information and exit.
-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.

AUTHORS

Joseph Heled, Øystein Johansen, Jørn Thyssen, and Gary Wong, with the assistance of many others <bug-gnubg@gnu.org>.