The Rat Defense: Harmonist 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 2 moves: 1. e4 d6 2. f4. The resulting position leaves black to move.
Resulting Position
1. e4 d6 2. f4
rnbqkbnr/ppp1pppp/3p4/8/4PP2/8/PPPP2PP/RNBQKBNR b KQkq - 0 2Resulting Position