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Step 1 / 2
Black threatens ...Nxe4. Simply defending with f3 works, but it weakens your king. Nd2 defends e4 just as well, develops a piece, and keeps your structure intact — the better defense, not just any defense.
Step 1 / 2
Black threatens ...Nxe4. Simply defending with f3 works, but it weakens your king. Nd2 defends e4 just as well, develops a piece, and keeps your structure intact — the better defense, not just any defense.