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[what is this?]

Alekhine, Alexander 8 games, 1912-1934 Anderssen, Adolf 2 games, 1851-1852 Euwe, Max 1 game, 1948 Fischer, Bobby 5 games, 1956-1963 Korchnoi, Viktor 1 game, 1994 Lasker, Edward 1 game, 1912 Lasker, Emanuel 1 game, 1896 Marshall, Frank 2 games, 1904-1912 Morphy, Paul 1 game, 1858 Najdorf, Miguel 1 game, 1929 Nezhmetdinov, Rashid 2 games, 1958-1962 Petrosian, Tigran 1 game, 1961 Pre-arranged, move by move 2 games, 1985-1999 Rubinstein, Akiba 1 game, 1907 Spassky, Boris 2 games, 1960-1968 Swedish Steel Swedes beating world champions 8 games, 1920-1995 Tal, Mikhail 4 games, 1953-1988