Formation: Hippopotamus Attack

1.
1. a3
2. e5
2.
3. b3
4. d5
3.
5. c3
6. Nf6
4.
7. d3
8. Nc6
5.
9. e3
10. Bd6
6.
11. f3
12. O-O
7.
13. g3

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The Formation: Hippopotamus Attack is a chess opening classified under ECO code A00 (Flank openings). It is a variation of the Formation family. Step through the moves on the board above, then play the line yourself or review it with the built-in engine.