Chess opening · ECO C20
King's Pawn Opening
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1. e4 e5 2. b3
King's Pawn Opening is catalogued under ECO code C20. It is reached after 2 moves (3 half-moves): 1. e4 e5 2. b3. After the last move it is Black to play. White opens 1. e4. It is the defining line of the King's Pawn Opening family, which has 3 catalogued lines in total.