Chess opening · ECO A45
Basque Opening
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1. d4 Nf6 2. b3
Basque Opening is catalogued under ECO code A45. It is reached after 2 moves (3 half-moves): 1. d4 Nf6 2. b3. After the last move it is Black to play. White opens 1. d4. It is the defining line of the Basque Opening family, which has 1 catalogued line in total.