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Against 2.c4 and 3.e4: 3…Nc6 and the d4 square

Against the big center, you answer 3…Nc6 33 times out of 36, for 59%. The knight is aiming at one square only: d4.

Recall: after 3.Nc3 c5 4.d5, why …Bxc3+ right away?