/usr/games/gnuchessx is in gnuchess 5.07-7.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
# Start GNU Chess, but have it use the xboard protocol.
# This makes it easy for programs (like xboard) to simply invoke
# "gnuchessx" and have it do the "right thing."
# The final parameter is more complicated to work around a
# bug in some old Unix-like systems; see the GNU autoconf documentation
# for the rationale.
echo "gnuchessx is obsolete, please read the manpage for details." >&2
gnuchess xboard ${1+"$@"}
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