MAKEBEAROFF(6)MAKEBEAROFF(6)NAMEmakebearoff - generate a GNU Backgammon bearoff database
SYNOPSISmakebearoff [-HCcgnvh] -f filename [-t PxC] [-o P] [-s cache-size] [-O
filename]
DESCRIPTIONmakebearoff 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 che‐
quers 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 che‐
quers.
-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 regenerat‐
ing 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 probabili‐
ties 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 data‐
base for up to fifteen chequers on ten points:
makebearoff-o 10 -f gnubg_os.bd
Note that this database is 118MB in size.
SEE ALSOgnubg(6), bearoffdump(6)AUTHORS
Joseph Heled, Øystein Johansen, Jørn Thyssen, and Gary Wong, with the
assistance of many others <bug-gnubg@gnu.org>.
This manual page was written by Russ Allbery <rra@debian.org>, for the
Debian GNU/Linux system (but may be used by others). It may be redis‐
tributed and/or modified under the terms of version 2 of the GNU Gen‐
eral Public License as published by the Free Software Foundation (the
same license as GNU Backgammon).
2006-01-15 MAKEBEAROFF(6)
