[Retros] Find the total number of unique PGS

[Rewan Demontay]

Hello, I have a little idea I thought would be fun.

Consider a PG in 5.5 that ends with e8=Q# double queen check, with these
three pieces in a fixed place: wQd7e8 & bKf7.

One such PG is 1. d4 e5 2. d5 Bc5 3. d6 Ne7 4. dxe7 f6 5. Qxd7+ Kf7 6.
e8=Q#.

The challenge is to find all such PGs. A little solving for the lot of you!


My summer break has begun. So who knows, I may come up with more topics for
everyone here over the sumer.

Sincerely,

James Malcom
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