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MAKEBEAROFF(6)			  Games Manual			  MAKEBEAROFF(6)

NAME
     makebearoff - generate a GNU Backgammon bearoff database

SYNOPSIS
     makebearoff [-HCcgnh] -f filename [-t PxC] [-o P] [-s cache-size] [-O file-
     name]

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 (approxi-
     mate) 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  al-
	    ready 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.

SEE ALSO
     gnubg(6), bearoffdump(6)

AUTHORS
     Joseph  Heled,  Oystein Johansen, Jorn Thyssen, and Gary Wong, with the as-
     sistance of many others <bug-gnubg@gnu.org>.

     This manual page was written by Russ Allbery <rra@debian.org>, for the  De-
     bian 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 Li-
     cense as published by the Free Software Foundation (the same license as GNU
     Backgammon).

				   2024-02-27			  MAKEBEAROFF(6)

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