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16... Qf7 
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The forked pieces are going nowhere, so I took the time to get rid of the well placed white .queen | 
   
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17. Qg4 
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This is the final mistake. When you are losing its all to easy to miss a move, and this just loses the queen. | 
   
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17... Nxg4 18. Nd3 Bd4 
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Not letting the piece on h4 to get away, as the bishop is attacking the white rook. | 
   
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19. Rae1 gxh4 20. h3 Ne5 
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Swapping off pieces is the easiest way to convert the large material advantage to a win. | 
   
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21. Nxe5 Bxe5 
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White resigns as they are a Queen, a Bishop, and a pawn down. | 
   
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