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[what is this?]

alekhine 1 game, 1974 benko gambit 2 games, 1971-1973 bogoindian 1 game, 1952 budapest gambit 3 games, 1984-1990 caro kann 17 games, 1911-2003 catalan 9 games, 1937-2001 current games examples 12 games, 1923-2004 dutch 1 game, 1951 e4 d6 1 game, 1908 englund gambit 2 games, 1923-1933 neo grunfiled 1 game, 1970 nimzo indian 4 games, 1943-2001 queen indian 2 games, 1927-1952 robatch 1 game, 1901