Ruy Lopez / Exchange Variation 4...dxc6 5.Nxe5

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JPSterling

[Black to move]

After 9.Nc3, why is 9...Ne7 a strong move, but 9...Nf6 a mistake?

Compadre_J

Because the d4 square is weak.

f6 is ruled out due to the chess rule of the diagonal square 1 space apart.