Ruy Lopez, Open, Classical Defense
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In chess, C83 is the ECO code for the Ruy Lopez, Open, Classical Defense chess opening. The game begins 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7. This is the Classical Defense of the Open. White's kingside majority vs Black's queenside. White must dislodge the knight without sacrificing any initiative on Black's king. For Black, the pawn storm has already begun. Max Euwe scored +13=17-5 as Black.