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1. d4 Nf6 2. c4 g6 3. Nc3 d5
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Grunfeld Defense |

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4. Nf3 Bg7 5. e3
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I personally think that 4.Nf3 and 5.e3 are a mistake. White may play 4. e3 and 5. Ne2, because in this position the Bishop can't attack the white in g4 (6. f3). |

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5... Bg4 6. Be2 O-O 7. O-O Re8 8. Ne5 Bxe2 9. Qxe2 Nbd7 10. Nxd7 Qxd7 11. Re1 c6 12. c5
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This is a mistake. White must remove the pawn in d5 |

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12... e5 13. e4 Nxe4
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Black gains a pawn. In case of 14. Nxe4 black have to play exd4, attacking the Knight in e4 |

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14. Nxe4 exd4 15. Qd3 Qf5 16. Nf6+ Bxf6 17. Qxf5 Rxe1#
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