Unfortunately, I have now discovered multiple solutions to the position. But the shortest amount of moves is still 10.0, hopefully.
Shortest-proof-game challenge
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Nov 21, 2023
0
#5963
Leither123 wrote:
Unfortunately, I have now discovered multiple solutions to the position. But the shortest amount of moves is still 10.0, hopefully.
If you ever want a cursory check at your positions, Jacobi has a proof game website where you don’t even have to download an engine.
BishopTakesH7 wrote:
If you ever want a cursory check at your positions, Jacobi has a proof game website where you don’t even have to download an engine.
Thx! Didn't know that. I'll check it out!
Leither123 wrote:
Well, worry no more, as I will now present a position with an intended length.
I intend for this to have PGs in 10.0, and I have my own solution ready (though I feel there are more solutions). To be honest, I didn't bother checking thoroughly to see if it's possible to get below ten, so feel free to try getting there
(Interestingly, due to the way I created the positions, the move length is hidden in the FEN! Has anyone noticed this before?)
For this position, Stelvio finds there are many solution in 10.0, none in 9.5, many in 9.0, none in 8.5, and none in 8.0.
Nov 21, 2023
0
#5967
Leither123 wrote:
Sounds useful! Is this the website?
Should be.
@5964
tygxc wrote:
@5964
You cheated 
The knight on b1 should have been captured.
@5973
Here's one of the many solutions to #5964 in 9.0.
EndgameEnthusiast2357 wrote:
Who authorized this weird change of the challenge?
You did. Don't you remember?
The evolution was nigh.
No I didn't lol, I just said the proof games should always end in black making the last move so that it's a full number of moves.
EndgameEnthusiast2357 wrote:
No I didn't lol, I just said the proof games should always end in black making the last move so that it's a full number of moves.
But if that became a requirement, it would be a very weird change.
To be more accurate, there is a person who wants full moves.
(Posted in response to EndgameEnthusiast's deleted comment that "people want full moves".)
EvinSung wrote:
#5984
Here's one of several solutions in 9.5.
(Interestingly, due to the way I created the positions, the move length is hidden in the FEN! Has anyone noticed this before?)
Yes, I did! A bit late or I would have aborted my attempts to find an SPG in 6.5 earlier! FENs don't count in serious compositions - not the number of moves, not the proximity of the 50-move line, not the side on move, not the castling rights or anything else in the FEN.
ONLY THE DIAGRAM + the text of the challenge (stipulation).
If I understand you well this one has one intended solution in 10.0 moves. Or is it two? Tomorrow I'll look!