A move that seems quite logical, taking the knight to e6. However, this position is yet another case that when in doubt, castling is best.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. d2d3  5... d7d6  6. c2c4 One of many possible variations for White on the Ruy Lopez with an early d3. 6... c8g4  7. h2h3  7... g4f3  8. d1f3  8... f6d7  9. c1e3  9... f8e7  10. b1c3 