[Retros] bug?

[paul raican]

Dear retro friends,
Natch offers the following proof game that is obviously illegal:
1.Pd2-d4   Pa7-a5   2.Ke1-d2   Ra8-a6   3.Kd2-c3   Ra6-c6+  4.Sb1-d2.

Is this a bug?
Best wishes,
   P.R.

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