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Unfortunately, no one seems to know the circular chess variant I have
sketched in the previous message of this thread. The board was similar to
this one:

http://www.chessvariants.org/index/msdisplay.php?itemid=MSknightsofthero

and the rules for going through the center were similar like in this
variant

http://www.chessvariants.org/shape.dir/globe.html