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1. e4 e5 2. Nc3 Nf6 3. Nf3 Nc6 4. Bc4 Bc5 5. b4 
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using an outside pawn to break the symmetry. | 
   
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5... Bxb4 6. Bb2 b6 7. O-O Bb7 
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Black's fianchetto would keep things balanced, but White already has several possible combinations planned. | 
   
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8. Nd5 
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Threatens Bxe5, Nxc7 .  Is preceded by the threat of Nxe5, Nxb4, Nxf7 forking Black's queen and rook. | 
   
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8... Nxe4 9. Nxe5 Nxd2 10. Re1 
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Black must castle to avoid losing his queen to Nxc6  | 
   
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10... O-O 11. Nxb4 Nxb4 12. Qxd2 a5 13. Nxd7 
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The beginning of the end.  White is up a piece and has both bishops (vs. Black's bishop knight).  White OWNS the center and has an advanced knight backed up by a queen and rook on central files with the queen ready to be doubled with the other rook. | 
   
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13... Re8 14. Rxe8+ Qxe8 15. Re1 Qc8 16. Re7 Nc6 17. Rxf7 Qe8 18. Rxg7+ Kh8 19. Rg8# 
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