24 ( +1 | -1 ) Probably Because . . .. . . he died at 91 and played his best chess half a century ago in the 30's, 40's (when he was twice U.S. Champion), and early 50's (when he got shut out by Bronstein on Bd. 2 in the USA-USSR match--no shame at that time, when Bronstein was probably the strongest player in the world).
44 ( +1 | -1 ) He played ...first board in the legendary USA-USSR radio-matches 1945 and 1946 against Botvinnik and Smyslov (I think he lost both matches). The match against Botvinnik can be found here (commented by Kasparov) www.chessbase.de/2005/denker/denkerbotvinnik.htm