Formation: Hippopotamus Attack is a chess opening with the ECO code A00, part of the Formation family. It goes 1. a3 e5 2. b3 d5 3. c3 Nf6 4. d3 Nc6 5. e3 Bd6 6. f3 O-O 7. g3. White opens with 1. a3 (the Anderssen move) and Black answers 1... e5. After 13 moves it is Black to move. The lesson on the board explains every move of the line and lets you play it yourself; it is free.
The moves
1. a3 – White plays the pawn to a3
1... e5 – Black plays the pawn to e5
2. b3 – White plays the pawn to b3
2... d5 – Black plays the pawn to d5
3. c3 – White plays the pawn to c3
3... Nf6 – Black plays the knight to f6
4. d3 – White plays the pawn to d3
4... Nc6 – Black plays the knight to c6
5. e3 – White plays the pawn to e3
5... Bd6 – Black plays the bishop to d6
6. f3 – White plays the pawn to f3
6... O-O – Black castles kingside
The line goes on for 1 more moves; the lesson shows them all.
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