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1. d4 d5 2. c4 e6 3. cxd5 exd5 4. Nc3 Nf6 5. Nf3 c6 6. Bg5 Be7 7. e3 O-O 8. Bd3 Nbd7 9. Qc2 Re8 10. O-O Nf8
Carlsbad, 10…Nf8. Which move?