[Retros] Pawn to-the-6th rank mates

[Nicolas.Dupont at math.univ-lille1.fr]

> For Category II:

> b6#/...b3# etc., discovered checkmate

>

> 1.Pg2-g3  Pf7-f5  2.Ff1-h3  Pf5-f4  3.Fh3xd7  Fc8xd7

> 4.Ph2-h3  Fd7xh3  5.Pg3-g4  Fh3xg4  6.Re1-f1  Dd8-d6

> 7.Rf1-g2  Re8-d7  8.Rg2-h2  Pf4-f3


Opposite side :

1.Pd2-d4   Ph7-h5   2.Fc1-h6   Pg7xh6   3.Pf2-f4   Ff8-g7
4.Pf4-f5   Fg7-e5   5.Pd4xe5   Re8-f8   6.Dd1-d5   Rf8-g7
7.Dd5xb7   Rg7-h7   8.Db7-e4   Fc8-a6   9.Pf5-f6