Ruy Lopez, Schliemann Defense
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In chess, C63 is the ECO code for the Ruy Lopez, Schliemann Defense chess opening. The game begins 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5. The German lawyer Adolf Schliemann actually played a variation of the Cordel Defense: 3....Bc5 4.c3 f5. The variation originated in 1847 by Carl Jaenisch. By giving up the f-pawn for the e-pawn, Black attains a pawn majority in the center which can be quite beneficial and by opening the f-file, Black can pressure the kingside with the rook on f8. It's risky play with Black sometimes sacrificing one or two pawns. Rudolf Spielmann played it as Black +6=5-1 as did Frank Marshall +9=8-4. Alexander Shabalov has a plus score in international play.