The Sicilian Defense

1.e4 c5, or, in other words, Black playing a pawn to c5 to counter White’s opening move of pawn to e4. Controlling the four center squares is key to establishing a good position in the opening game. While this often involves trading pawns, responding to e4 with c5 keeps pressure on the d4 square, but doesn’t leave the pawn hanging.

https://en.wikipedia.org/wiki/Sicilian_Defence

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