[Retros] First example of 'reverse mate' theme

[Mario Richter]

Joost> r7/k1Knq3/b1pr4/Ppp1b3/pnrp4/pp6/8/8
Joost> 
Joost> Only retro-play I can see is -1. b7-b5 Kc8-c7 -2. Sb8-d7 etc.

White's capturing e.p. is not a mate.

Last black move could have been e.g. Bc8-a6, Qf7-e7 and - destroying
many attempts with a black configuration like Ka7,Ra8,Ba6 - Rb8-a8!

mario