Chess opening · ECO E01
Catalan Opening: Open Defense
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1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2
Catalan Opening: Open Defense is catalogued under ECO code E01. It is reached after 4 moves (7 half-moves): 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2. After the last move it is Black to play. White opens 1. d4. It is a named variation of the Catalan Opening, which has 32 catalogued lines in total. 3 deeper lines continue from here, listed below.