[Retros] 3 tasks

[fieberg at gcr.com]

1) SPG where each white piece - apart from pawns - gives a check.

2) SPG where each white piece - including pawns - gives a check. Pawns may
do this as promoted piece.

3) SPG where each white piece - including pawns - gives a check. Pawns are
not allowed to give a check as promoted piece.


Very nice would be:
- each piece gives a check only once
- the last move is a double checkmate
- the number of moves is as short as possible.


Regards,
CF