NEW VARIANTS:
http://history.chess.free.fr/rollerball.htm
https://www.chessvariants.com/40.dir/rollerball/index.html
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https://www.pychess.org/variant/shogun
https://www.chessvariants.com/incinf.dir/bario.html
https://www.chessvariants.com/index/listcomments.php?order=DESC&itemid=Bario
https://le-cdn.website-editor.net/20ef5f800ea646c29f6852cfc5ceda07/dms3rep/multi/opt/BAR028-e15a849c-960w.jpg
Non-chess: ( won't add draughts: https://lidraughts.org/ )
-gomoku, avalam, Fanorona https://fr.wikipedia.org/wiki/Fanorona
+Avalam, Fanorona https://fr.wikipedia.org/wiki/Fanorona
Yoté https://fr.wikipedia.org/wiki/Yot%C3%A9 http://www.zillionsofgames.com/cgi-bin/zilligames/submissions.cgi/92187?do=show;id=960
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-Later :
-Qoridor (wider lines in another color ?)
-Hexagonal variants (+ Gex game)
+Qoridor: reserve moves to place the walls, convention from left / from top