[Retros] Task - double check mate

[raosorio at fibertel.com.ar]

Allan Bell wrote,

As suggested by Noam, here is a double check-mate (with captures) given by
a piece returning to its home square.  Both checks are required.

1.Pa2-a4   Pe7-e5   2.Ra1-a3   Ke8-e7   3.Ra3-e3   Ke7-d6
4.Sb1-c3   Kd6-c5   5.Pb2-b4   Kc5xb4   6.Bc1-a3   Kb4xa3
7.Qd1-b1   Pb7-b5   8.Qb1xb5   Bf8-b4   9.Ke1-d1   Pd7-d6
10.Kd1-c1   Bc8-f5   11.Kc1-b1   Bf5xc2   12.Kb1-a1   Pf7-f5
13.Sc3-b1

But there must be a shorter setting.

Here is one without captures,

1.Pe2-e3   Pd7-d6   2.Ke1-e2   Bc8-h3   3.Ke2-f3   Pe7-e6   
4.Kf3-f4   Sg8-e7   5.Kf4-g5   Pg7-g6   6.Kg5-f6   Se7-g8
natch 0.22 s

Regards,