Here's a repeat of my #4729 position from five days ago. I'm surprised nobody has posted a valid explanation of why it's illegal. It's not too difficult.
Illegal Position Contest!
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May 12, 2021
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#4743
black has 13 pieces on board.
white requires 3 captures for the doubled pawns
the pawn a6
n9531l1 wrote:
I hope this position will be a little more challenging. It was submitted as a helpmate in 10 problem (Evgen S. Orlov, 5516 The Ural's Problemist 60 2009). Why is it illegal?
It is illegal because Black's g-pawn couldn't get over the the right!!!!
this is a legal position
HockeyFox7 wrote:
n9531l1 wrote:
I hope this position will be a little more challenging. It was submitted as a helpmate in 10 problem (Evgen S. Orlov, 5516 The Ural's Problemist 60 2009). Why is it illegal?
It is illegal because Black's g-pawn couldn't get over the the right!!!!
Also illegal because the coordinates are wrong, because h1 is a dark square, and a1 is a light square! (I just looked at a normal board)
watch:
ThebestA9player wrote:
white to move
thats legal
Ilampozhil25 wrote:
and making it illegal
um do you mean the pawn on h5 or h4?
and this is legal as white to move. nobody ever said black had to be able to castle.
natureexplorer wrote:
Okay, I have an idea. I know by counting the White pieces that Black captured 7 times (that includes the captures that happen in the process of trading). Let's see if the pawns can capture enough times to reach the positions they are at in the position shown. I'm counting...
Now you are on the right track.
Sameer_chess-player wrote:
this is a legal position
Yes, easily legal. But we want to see illegal positions that look like they could be legal.
Sameer_chess-player wrote:
watch:
If you'd like to see it done in 20 moves instead of 29, here it is.
Sameer_chess-player wrote:
ThebestA9player wrote:
white to move
thats legal
The other solution, in the next post after the problem was posted, used the bishop instead of the queen to lose a move. Both work equally well.
I think this position is illegal if it's white to move.
thats just stalemate
Certainly not a stalemate. Both sides have a legal move available.