The Sicilian Defense: Kopec System is a chess opening classified under ECO code B50 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 c5 2. Nf3 d6 3. Bd3. The resulting position leaves black to move.
Resulting Position
1. e4 c5 2. Nf3 d6 3. Bd3
rnbqkbnr/pp2pppp/3p4/2p5/4P3/3B1N2/PPPP1PPP/RNBQK2R b KQkq - 1 3Resulting Position