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[what is this?]

Alekhine Collectiion 3 games, 1925-1930 Astonishing Moves 13 games, 1889-2015 Games to learn by heart 8 games, 1904-2004 Ghost Attacks 2 games, 2001-2005 Grunfeld 4.h4 11 games, 1963-2013 King marches 4 games, 1894-1991 Mating patterns to visualize 1 game, 1898 Miscellaneous endings 15 games, 1889-2015 Nimzowitsch Collection 4 games, 1907-1924 Pirc Defense 4 games, 1962-1978 Positionnal masterpieces 5 games, 1973-2017 Semi-Slav / Stoltz / Shabalov 15 games, 1992-2016 Simple tactical shots 6 games, 1961-2010 Some short instructive games 1 game, 2005 Strategic Ideas 6 games, 1919-2014 Sveshnikov 3 games, 1948-2004