I think this position [#4764] is illegal if it's white to move.
No one has tried to answer my questions at #4773 about this legal position, so I'll ask them again. Is the position still legal if a black queen is placed at f6? Does who has to end up with the move make a difference in the legality?
I'll wait a while for a response, and then give my answers, to see if anyone disputes them.
That's correct. I think natureexplorer was also about to find it. It can be explained a little more briefly. White's three available captures were pawn captures to make three pairs of doubled pawns. Black's seven available captures were all made by six pawns, one each by bcefg pawns and two by the d-pawn, with all six ending on the c through h files. So neither side's a-pawn was captured or could have promoted, but White's a-pawn has disappeared (illegally) from the board.
wait. what about my logic in which 3 captures by white pawns= white should get the pawn to h6 without captures which is impossible?
theres a white pawn on h6 right?
and before you say, "but the original black h pawn can get captured"
black has all 8 pawns
you cant promote or capture them
theres a white pawn on h6 right?
No, but there's a white pawn on h3.
Here is Mikey383's #4764 position with a black queen added at f6. Is the modified position legal if it's White to play? What if it's Black to play?
white to move
This is possible because of 1. Nf3 e6 Ng1
white to move
This is possible because of 1. Nf3 e6 Ng1
After those moves, it's Black to move.
[Position with nine white pawns]
I can see you tried hard to create an illegal position that would make us think it might be legal without a careful analysis. This one was not too successful, but keep trying.
[Position with nine white pawns]
I can see you tried hard to create an illegal position that would make us think it might be legal without a careful analysis. This one was not too successful, but keep trying.
could you stop saying the same thing over and over?
and this is legal as white to move. nobody ever said black had to be able to castle.
I'm not sure what the point of this one is. Your final position is the same as the position you had after move 1.
oh i mean this
um......
could you stop saying the same thing over and over?
Probably not.
I think this position is illegal if it's white to move.
I couldn't see any reason to think it would be illegal.
If black just moved and it was white's turn in the position
I think this position is illegal if it's white to move.
I couldn't see any reason to think it would be illegal.
If black just moved and it was white's turn in the position
Right. My proof game ended in that position with White to move. It's a legal position that can be reached with either White or Black to move, whichever you want.
That's correct. I think natureexplorer was also about to find it. It can be explained a little more briefly. White's three available captures were pawn captures to make three pairs of doubled pawns. Black's seven available captures were all made by six pawns, one each by bcefg pawns and two by the d-pawn, with all six ending on the c through h files. So neither side's a-pawn was captured or could have promoted, but White's a-pawn has disappeared (illegally) from the board.