https://www.pychess.org/variant/shogun
https://www.chessvariants.com/other.dir/fugue.html
-https://www.chessvariants.com/rules/spartan-chess
https://www.chessvariants.com/incinf.dir/bario.html
https://www.chessvariants.com/index/listcomments.php?order=DESC&itemid=Bario
https://www.bario-chess-checkers-chessphotography-spaceart.de/