[what is this?]

[what is this?]

albin counter Kd2 5 games, 1914-1964 Benoni benoni,Vaganian,Kb1 3 games, 1957-1978 catalan 52 games, 1940-2001 f-ck stonewall attack F-ck stonewall attack! 5 games, 1920-2005 queen's gambit accepted queen's gambit accepted 15 games, 1963-1998 trompowsky un levitsky attacks crushed 1 game, 1985