How many moves needed to reach this position? &quot;Homebase&quot; is where all the surviving pieces are apparently on their starting squares. Here is a very easy new example proof game: can you find the unique shortest game that leads to this position?
[Title &quot;A.Buchanan 26-11-2020: shortest proof game?&quot;]
[FEN &quot;rnbqkbnr/ppppppp1/8/8/8/8/PPPP1P1P/RN2K1NR w - - 0 1&quot;]

Yes c1 is empty!
I have no idea about this kind of problems, but my guess would be something like this.
[FEN &quot;&quot;]

1. g4 h5 2. Bg2 hxg4 3. Bf3 gxf3 4. Kf1 fxe2+ 5. Kg2 exd1=R 6. Kf3 Rxc1 7. Ke2 Re1+ 8. Kxe1

Is that unique? I have no idea.