zhuoliang: Na3 is a better move than Nc3 or a5. a5 only leaves the pawn weak and ties down the rook to its defense. Nc3 may help prevent ...d5, but it has pretty limited movement from c3. On a3, the knight is ready to enter c4. If black exchanges on d3 and plays ...d5 right away, then c4 ...
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Kibitzing
