/usr/share/xscreensaver/config/queens.xml is in xscreensaver-gl 5.34-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="queens" _label="Queens" gl="yes">
<command arg="-root"/>
<video href="http://www.youtube.com/watch?v=Ssy0ldFDeAs"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="20000"
convert="invert"/>
<hgroup>
<boolean id="wire" _label="Wireframe" arg-set="-wireframe"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</hgroup>
<xscreensaver-updater />
<_description>
The N-Queens problem: how to place N queens on an NxN chessboard
such that no queen can attack a sister?
See also the "Endgame" screen saver.
https://en.wikipedia.org/wiki/Eight_queens_puzzle
Written by Blair Tennessy and Jamie Zawinski; 2002.
</_description>
</screensaver>
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