[Retros] Pawn to-the-7th rank mates

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

Dear Hiro,


> Category D:

> bxc7#/...bxc2# etc., double checkmate

>

> 1.e4 b5 2.Bxb5 Nc6 3.Bxc6 dxc6 4.b4 Bf5 5.b5 Bxe4 6.b6

> Bxc2 7.d3 Kd7 8.Be3 Kc8 9.Nd2 Kb8 10.Rb1 Qc8 11.bxa7#

> (Andrey Frolkin)


I got the following one with same number of moves but fewer captures :

1.Pb2-b4   Pe7-e5   2.Pb4-b5   Dd8-g5   3.Pb5-b6   Dg5-e3
4.Pd2xe3   Ff8-a3   5.Dd1-d5   Pd7-d6   6.Dd5xb7   Cb8-d7
7.Db7-a6   Fc8-b7   8.Cb1xa3   O-O-O    9.Ta1-b1   Rc8-b8
10.Tb1-b2   Fb7-a8   11.Pb6xa7

Who is the recordman in such a case ?

Thanks for your interesting tasks,

Nicolas.