[Retros] Solution to Problem #15245

[c14]

Hi retro fans,


I was browsing the retro corner, and came across this problem in Die Schwalbe No. 255: (Problem #15245)


13+15. SPG in 5.5 moves (Einstein)
rnbqkb1r/pppppppp/8/8/8/8/PPPPPPPP/2BQKB1R


After some tries I found a solution:
1. d4 e5
2. Be3=N exd4=N
3. Nd2=P Nxe2=B
4. Rc1=B Bxf1=R+
5. Nxf1=B Ne7=P
6. Ne2=P

but I have no idea how to prove the uniqueness (and shortestness) of the solution.


Does anyone have any idea on how to solve Einstein chess PGs in general?


Ryou Niji
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