In chess, the move 9.Bc4 is one of the main options in the chess opening called the Yugoslav Attack, which is an attack in the Dragon Variation of the Sicilian Defence. Also known as the Rauzer System or the St George Attack, the Yugoslav Attack begins with the following moves: 1. * e4 c5 2. * Nf3 d6 3. * d4 cxd4 4. * Nxd4 Nf6 5. * Nc3 g6 6. * Be3 Bg7 7. * f3 O-O 8. * Qd2 Nc6 9. * Bc4 English GM John Emms states: The ECO code for the Sicilian Dragon, Yugoslav Attack, 9.Bc4 is B77.