开局

Bishop's Opening: Berlin, Ponziani, Urusov, Keidansky Gambit

1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.Nf3 Nxe4 5.Qxd4 Nf6 6.Bg5 Be7 7.Nc3
顶级棋手