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

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

> For Category II:

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


Another one, probably not the shortest for the c6# case :

1.Pe2-e4   Pa7-a5   2.Ff1-a6   Pb7xa6   3.Pe4-e5   Fc8-b7
4.Pe5-e6   Pd7xe6   5.Pc2-c4   Dd8xd2   6.Re1xd2   Re8-d7
7.Rd2-c3   Rd7-c6   8.Dd1-d7   Rc6-b6   9.Pc4-c5   Rb6-a7
10.Fc1-e3   Fb7-d5   11.Pc5-c6