if you play 1.e4..

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Avatar of Efim_Bogoljubov

Obviously c5, better due to the big theory in all of the variation, if u remeber all of the moves in the most common line, u have win an half of the game.

Avatar of i_r_n00b

i like playing against c5

Avatar of luminaire

I like playing against 1...c5 as well, just because I am familiar with it and play it as black (along with the French).  I think it leads to more exciting and dynamic play, and frankly I don't enjoy most Ruy Lopez variations as white.