Shortest-proof-game challenge

Proof game in 11.5.

Proof game in 11.0.

Proof game in 11.5.

Proof game in 12.0.

Proof games in 10.0.

Found this in an old note. Past me seems to think it's unique.

The computer does not share your optimistic appraisal of the situation.

Here is a variation of a position in another thread (as requested by n9531l1):

I'll be watching for someone to shorten my proof game in 32.5 for this position.

27.5

That's good. I don't think it can be shorter than this.

Proof game in 21.5.

Here's a new blog post some of you might find interesting: Capture-free proof games. As I mentioned before in this thread, unique play is required in standard proof games.

Source: Andrew Buchanan, Problemesis 2002. Proof game in 11.5

Proof game in 28.5.