Shortest-proof-game challenge
Here is a variation where all the pieces (officers) are in their ideal positions. Finding an SPG will also answer the question: What precisely was the only possible last move?
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Here is a variation where all the pieces (officers) are in their ideal positions. Finding an SPG will also answer the question: What precisely was the only possible last move?
The last move here is the only one possible.

@6155
And the queen triangle to lose a tempo...
Would doing it without a queen triangle win 2nd prize?
@6155
And the queen triangle to lose a tempo...
Would doing it without a queen triangle win 2nd prize?
Definitely! But that is where the buck stops as I rewarded 3rd prize to myself for finding a way to get all officers to their rightful places

Here's my first proof game try. Leither will tell us how much shorter it needs to be.
end with a move by White.
As you wish.