Chess opening · ECO A00
Formation: Hippopotamus Attack
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1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3
Formation: Hippopotamus Attack is catalogued under ECO code A00. It is reached after 7 moves (13 half-moves): 1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3. After the last move it is Black to play. White opens with a less common first move. It is a named variation of the Formation, which has 2 catalogued lines in total.