The Hippopotamus Defense is a chess opening classified under ECO code B00 in the Semi-Open Games family, where Black responds to 1.e4 with something other than 1...e5, including the Sicilian Defense, Caro-Kann, and Pirc. It is reached after 3 moves: 1. e4 Nh6 2. d4 g6 3. c4 f6. The resulting position leaves white to move.
Resulting Position
1. e4 Nh6 2. d4 g6 3. c4 f6
rnbqkb1r/ppppp2p/5ppn/8/2PPP3/8/PP3PPP/RNBQKBNR w KQkq - 0 4Resulting Position