Library/Openings/Formation/Hippopotamus Attack ECO A00
Opening· 13 plies

Formation: Hippopotamus Attack

An entry in the Encyclopedia of Chess Openings (ECO A00), reached after 13 half-moves: 1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3.

Formation: Hippopotamus Attack ECO A00
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Black rook
Black bishop
Black queen
Black rook
Black king
Black pawn
Black pawn
Black pawn
Black pawn
Black pawn
Black pawn
Black knight
Black bishop
Black knight
Black pawn
Black pawn
White pawn
White pawn
White pawn
White pawn
White pawn
White pawn
White pawn
White pawn
White rook
White knight
White bishop
White queen
White king
White bishop
White knight
White rook
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End of this line

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About this opening

Formation: Hippopotamus Attack is an opening in the Encyclopedia of Chess Openings, classified under code A00. ECO group A (A00–A99) covers flank and irregular openings, including the English, Bird, Réti and Dutch defences. This particular variation is reached after 13 half-moves from the starting position, with the move sequence 1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3.

The opening sequence in prose form: 1.a3 e5, 2.b3 d5, 3.c3 Nf6, 4.d3 Nc6, 5.e3 Bd6, 6.f3 O-O. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.