Ruy Lopez, Closed Defense
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In chess, C84 is the ECO code for the Ruy Lopez, Closed Defense chess opening. The game begins 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7. There are several ECO codes associated with the Closed Variation. In the C84, there are the drawish 6.d3 and 6.Nc3 variations and the more aggressive Center Attack, 6.d4.