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/usr/share/doc/cgoban/README.Debian is in cgoban 1.9.14-17.

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Taken from the cgoban page <http://www.igoweb.org/~wms/comp/cgoban>

   CGoban ("Complete Goban") provides a large set of go-related services
   for Unix and X11. A list of the functions that it provides:
     * Play go against another player. When playing a game locally, you
       have a choice of rule sets and time controls. I made a strong
       attempt at implementing the rule sets as precisely as possible:
          + Chinese rules have a true Superko rule.
          + Japanese rules correctly recognize seki and award no points.
          + Japanese rules let you locally resolve disputes at the end of
            the game.
     * Edit and view SGF files. CGoban provides full functionality for
       editing and viewing SGF files.
     * Connect to a go server over the internet. CGoban can connect to
       NNGS or IGS and gives a convienent graphical user interface to the
       server.
     * Act as a bridge to go modem protocol. Go modem protocol has become
       a standard way for computer go programs to communicate. CGoban can
       let you connect to devices (such as modems) speaking go modem
       protocol, act as a graphical board for programs that speak go
       modem protocol out of stdin/stdout, or connect programs to one of
       the internet go servers.

NOTE: The default Go server, IGS, has moved from igs.nuri.net to
igs.joyjoy.net.

If you already have a .cgobanrc file from before cgoban 1.9.2-6 in
your home directory, it probably has the old address for igs.  Please
replace all occurrences of "igs.nuri.net" in that file with
"igs.joyjoy.net" to make it work correctly.

Richard Braakman