[what is this?]

[what is this?]

Caro-Kann Study 68 games, 1920-2010 Dutch/Bird Study 66 games, 1883-2015 KIA/KID and a l'il KGA too Study 92 games, 1911-2011 Later Study 93 games, 1893-2013 Nimzo-Indian Study 81 games, 1921-2014 QGA/QGD, and a lil QID too Study 57 games, 1906-2006 Scotch and Evans Gambit Study 29 games, 1851-2011 Spanish Study 53 games, 1866-2015