13 and ends in a full move!
Shortest-proof-game challenge
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BishopTakesH7 wrote:
n9531l1 wrote:
Here's a hint for those who want to try solving Leither's three positions. (#6064)
1st - SPG in 13.0
2nd - SPG in 11.5
3rd - SPG in 13.5
Are you sure these are unique? Because #1 in 13.0 is definitely not.
No one claimed these positions have unique SPGs. In fact none of them do.
n9531l1 wrote:
EndgameEnthusiast2357 wrote:
Ends in a full move and 23 moves, a prime number! Perfect!!
You need to be more consistent. At #6054 you asked for a proof game in 57.0, but 57 is not a prime number. You of all people should realize that making a proof game in other than a prime number of moves is a violation of common courtesy.
No, the prime number is just an extra, not a requirement. Ending in a full number of moves is the common decency. In fact the resign button shouldn't even be available in live chess if it's black to move. Black should have to make a move first before resigning.
This legal position was posted by GoodKnightMate00 in the Illegal Position thread. How short a proof game can you find for it? (I've shown the position here with White at the bottom.)
EvinSung wrote:
#6078
Here's a 26.5 move game. EvinSung will tell us how much shorter it needs to be.
EvinSung wrote:
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With white to move it might be illegal though.
EndgameEnthusiast2357 wrote:
EvinSung wrote:
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With white to move it might be illegal though.
It's easily legal. Try to make a proof game, as I did at #6079.
How could it be legal with white to move? What would Black's last move have been then?)
Dec 11, 2023
0
#6051
EndgameEnthusiast2357 wrote:
How could it be legal with white to move? What would Black's last move have been then?)
Nc3-b1.
It's illegal with white to move in the final position. I just showed how it could be legal if it were black to move.
At #6081 you essentially said, "Here's a legal position with White to move. But it might be illegal with White to move."
EvinSung wrote:
#6087, #6088
I might take a look at these after EvinSung tells us how much shorter #6057 and #6079 need to be.
Dec 12, 2023
0
#6057
n9531l1 wrote:
EvinSung wrote:
#6087, #6088
I might take a look at these after EvinSung tells us how much shorter #6057 and #6079 need to be.
idk
@6087
@6088
Here's a hint for those who want to try solving Leither's three positions. (#6064)
1st - SPG in 13.0
2nd - SPG in 11.5
3rd - SPG in 13.5
Are you sure these are unique? Because #1 in 13.0 is definitely not.