[Retros] Pawn to-the-8th-rank mates

[Hirokaz ONODA]

Hi,

=R# unique, whereas =Q# non-unique

 1.Pc2-c4 Pb7-b6  2.Dd1-b3 Fc8-b7  3.Db3xb6 Pc7xb6
 4.Pc4-c5 Dd8-c7  5.Pc5-c6 Dc7-d6  6.Pc6-c7 Fb7-c6
 7.Pc7-c8=T

Hiro


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