Hi Alex Angel and welcome to ID2 !!
Thanks for your effort to talk in french, it's really appreciate !
From what you describe, it look's like a slideshow of picture in HAM... the chessboard were often used as background in earlier 3D rendering.
It would help a lot if you could remember group name or artist author.
If it's really a demo and not a game, then i suggest to have a look to those different site as they've often some screenshot :
http://www.df.lth.se/~cato/nostalgia.htmlhttp://kestra.exotica.org.uk/http://www.arabuusimiehet.com/break/amiga/index.phpIf you succesfully found your request, please keep us inform.
Good luck !