Changes

|[[Arts#:Category:Marcel Duchamp|Marcel Duchamp]] <ref>Photo by [https://en.wikipedia.org/wiki/Arnold_T._Rosenberg Arnold T. Rosenberg], [[Arts#:Category:Marcel Duchamp|Marcel Duchamp]] playing chess on a sheet of Glass, 1958, see [https://en.wikipedia.org/wiki/Francis_Naumann Francis M. Naumann], [https://www.slu.edu/arts-and-sciences/fine-and-performing-arts/faculty/bailey-bradley.php Bradley Bailey] ('''2009'''). ''[http://www.francisnaumann.com/Chess%20Book/ Marcel Duchamp: The Art of Chess]''</ref> <ref>[http://www.slu.edu/sluma-home/past-exhibitions/2009/duchamp Marcel Duchamp: Chess Master] [https://www.slu.edu/sluma-home Saint Louis University Museum of Art] [https://en.wikipedia.org/wiki/Saint_Louis_University Saint Louis University : SLU]</ref>