advaitpawar010 wrote:
even this
bishops cant jump over pawns
Illegal Position Contest!
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May 23, 2021
0
#4843
advaitpawar010 wrote:
is this illegal??
triple check at the same time
At first glance, this position might seem illegal for a number of reasons, but I promise you that the proof of its illegitimacy is a little more complex than it might initially seem. Can you find it?
queen just see the white queen dude its at that point where game just ends and everyone go with tata bye bye and yesss the black bishops how he made them both white i guess with pawn promotion but it is not in case
phycoparas wrote:
queen just see the white queen dude its at that point where game just ends and everyone go with tata bye bye and yesss the black bishops how he made them both white i guess with pawn promotion but it is not in case
Uhhh.... what? I mean... yes, it's a checkmated position... that doesn't make it illegal. And like you said yourself, the two light-squared black bishops could've been made with a pawn promotion... so... that's, like... not illegal?
May 23, 2021
0
#4847
AuroranMelody wrote:
At first glance, this position might seem illegal for a number of reasons, but I promise you that the proof of its illegitimacy is a little more complex than it might initially seem. Can you find it?
simply:
black cant promote on a light square
Ilampozhil25 wrote:
AuroranMelody wrote:
At first glance, this position might seem illegal for a number of reasons, but I promise you that the proof of its illegitimacy is a little more complex than it might initially seem. Can you find it?
simply:
black cant promote on a light square
Black can promote on a light square. If the black king were on g8, the position would be legal.
n9531l1 wrote:
Ilampozhil25 wrote:
AuroranMelody wrote:
At first glance, this position might seem illegal for a number of reasons, but I promise you that the proof of its illegitimacy is a little more complex than it might initially seem. Can you find it?
simply:
black cant promote on a light square
Black can promote on a light square. If the black king were on g8, the position would be legal.
Woahh..... I was just about to give that as a hint, so they'd know if they really got it. Yes, if the black king were on g8, this position would be fine. I'm glad someone got it! 
May 23, 2021
0
#4851
wait
so for the promotion of whites dsb(it is locked by the pawns), the c pawn was used(it captured blacks dsb), then for the black bishop promotion, the h pawn was used (hxgxh) whites g pawn was captured unpromoted, so white needs to promote the a pawn (theres nothing else) which had to capture twice (axbxa) to promote to a knight or something to be captured.
it captures blackss missing knight, then? all of blacks other missing pieces are already used.
so illegal.
Ilampozhil25 wrote:
wait
so for the promotion of whites dsb(it is locked by the pawns), the c pawn was used(it captured blacks dsb), then for the black bishop promotion, the h pawn was used (hxgxh) whites g pawn was captured unpromoted, so white needs to promote the a pawn (theres nothing else) which had to capture twice (axbxa) to promote to a knight or something to be captured.
it captures blackss missing knight, then? all of blacks other missing pieces are already used.
so illegal.
ooooohhhh so close!
Here is the real reason the illegality is hard to prove. The position is legal, even with the black king at h8.
Yes... I just realised the same thing. The a pawn should be left at a7, otherwise the puzzle is broken. Sorry, my bad. I actually didn't consider axbxa when I was proofchecking it.
Funny, I actually posted a comment saying the puzzle needed to be adjusted slightly, then I thought it wasn't actually broken and I was mistaken, so I deleted the comment, then I realised it was broken after all, and by then n9531I1 had posted a full proof of its legality. lmao
May 23, 2021
0
#4855
KMMCS88 wrote:
chessPlatypus01 wrote:
What's illegal about that?
check the e1 and e8 squares
AuroranMelody wrote:
Yes... I just realised the same thing. The a pawn should be left at a7, otherwise the puzzle is broken. Sorry, my bad. I actually didn't consider axbxa when I was proofchecking it.
That's OK. You fooled several people into thinking is was an illegal position.
May 23, 2021
0
#4857
i didnt even SEE that black doesnt have the a rook
if i had seen that, well add to my proof
.... then the a pawn takes blacks rook, so the position is legal.
wow the a rook is the piece least used
AuroranMelody, would you object if I posted your position in the Shortest Proof Game thread?
May 23, 2021
0
#4859
This position looks quite normal until you think about it. Black to move.
no kings