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1. e4 e5 2. Nf3 d6 3. d4 exd4 4. Nxd4 c5
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Leaves a big gaping hole on d5, and also weakens b5 slightly. |

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5. Nf3
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The proper retreat square, keeping an eye on e5. |

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5... Bg4
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Black needs to think about castling. Nf6 might have been better. There's little point in pinning the knight at this point because it's not threatening anything. |

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6. Be2 Nf6
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A good move, preparing to castle. |

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7. Nc3 Qe7
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Be7 was necessary. |

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8. O-O
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White sees that his e4 pawn isn't really in danger. |

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8... Nxe4
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Black takes the bait. |

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9. Nxe4 Qxe4 10. Re1
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If the queen doesn't move, Bb5 wins the queen, whether or not it's check. Black's only try is Qb4, but even here, he's in trouble. |

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10... Qc6 11. a4
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White could have won the queen right away with Bb5 !. |

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11... Qc7
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Now White has a forced mate. |

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12. Bb5+ Kd8 13. Re8#
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