updated 6611
Shortest-proof-game challenge

Here are two positions based off an old idea: (#6618)
Here's one of several SPGs for new version of second position.
At least the first position works. I don’t know if moving the bishop on b5 to a4 resolves the cook in the second position. Although Rh8-a8-a1-e1 is still possible, I think there will be a lot of interferences between the black pieces.

Here are two positions based off an old idea: (#6618)
Here's one of several SPGs for new version of second position.
At least the first position works. I don’t know if moving the bishop on b5 to a4 resolves the cook in the second position. Although Rh8-a8-a1-e1 is still possible, I think there will be a lot of interferences between the black pieces.
This one is now sound per Stelvio [solving program].

I don’t know if moving the bishop on b5 to a4 resolves the cook in the second position. (#6634)
Unique SPG in 25.0.

I don’t know if moving the bishop on b5 to a4 resolves the cook in the second position. (#6634)
Unique SPG in 25.0.
So it is a fix! This might be the furthest I can go with this idea, unless the position after 26. Kxa4 somehow has a unique proof game. If it does, it would certainly make the SPG difficult to find, but I highly doubt it because black has multiple free moves at this point. Could be worth testing though one last time…

I don’t know if moving the bishop on b5 to a4 resolves the cook in the second position. (#6634)
Unique SPG in 25.0.
So it is a fix! This might be the furthest I can go with this idea, unless the position after 26. Kxa4 somehow has a unique proof game. If it does, it would certainly make the SPG difficult to find, but I highly doubt it because black has multiple free moves at this point. Could be worth testing though one last time…
Comp says cooked:

I don’t know if moving the bishop on b5 to a4 resolves the cook in the second position. (#6634)
Unique SPG in 25.0.
So it is a fix! This might be the furthest I can go with this idea, unless the position after 26. Kxa4 somehow has a unique proof game. If it does, it would certainly make the SPG difficult to find, but I highly doubt it because black has multiple free moves at this point. Could be worth testing though one last time…
Comp says cooked:
Well, I wasn’t expecting this to be sound, so I will probably stop here. If it were sound, it would be a very difficult SPG to find, which is why I asked to test it. But #6634 should be good enough for me and it doesn’t look like I can extend the proof game any further.
I’m unsure about this one. I have a 44.5 move game, is it shortest?
Yes, it's a non-unique SPG, according to Stelvio 2.0 after 7:20:47 hours.