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Nimzo-Indian Defense: Classical, Berlin Variation

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 Na6 6.a3 Bxc3+ 7.Qxc3 Nxc5 8.b4 Nce4
顶级棋手