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| Sicilian, Dragon, Yugoslav attack, 9.Bc4 |
In chess, B77 is the ECO code for the Sicilian, Dragon, Yugoslav attack, 9.Bc4 chess opening. The game begins 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. The game proceeds in a number of ways. Black can proceed with a queenside pawnstorm, 9...a5, the favorite of Donald Byrne for whom it's named. Here White responds with Bb3 or a4. Black can trade Knight for Bishop with 9...Na5 but ECO determined that's good for White. Similarly, 9...Nxd4 was played exhaustively in the 1960s and White's advantage was convincingly proved so now it's rarely played. Also, Black can play 9...Nd7 with the idea of coordinating the Knights via b6 and a5 and finally posting one of them on c4. White gains tempi and ECO gives it mostly an unclear assessment. Black may continue 9...Bd7 but ECO B77 is only concerned with White's response to this other than 10.0-0-0 which is covered in B78-B79. In the B77, White most often plays 10.h4 or 10.Bb3. In most Yugoslav games, 0-0-0, h4 and Bb3 are all played by White and can probably be played in any order but h4 might create a tempo for Black and Bb3 may give White a tempo.
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