[Retros] a7#, b7#, etc.

[Hirokaz ONODA]

Hello,

For the pawn advance-to-the-7th-rank mate:
  
1.d4 c5 2.Bf4 Qc7 3.Bxc7 d6 4.dxc5 Be6 5.cxd6 Bb3 6.c4 Nc6
7.d7#

Hiro


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