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.
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.)
Here's a 26.5 move game. EvinSung will tell us how much shorter it needs to be.
With white to move it might be illegal though.
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?)
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."
I might take a look at these after EvinSung tells us how much shorter #6057 and #6079 need to be.
I might take a look at these after EvinSung tells us how much shorter #6057 and #6079 need to be.
idk
@6087
@6088
13 and ends in a full move!