Illegal Position Contest!
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Sack_o_Potatoes
Aug 22, 2022
0
#6441
eric0022 wrote:
I had thought #6470 is legal. As it turns out, the position is illegal when the king is on d5 - exclusively on that square.
The position is illegal when the white king is on d5, b5, b6, or b7.
CatRobots8 wrote: #6482
I was going to prove that the position was legal until I realised midway that you had seen further than I did and swapped the positions of some pieces as well.
eric0022 wrote:
CatRobots8 wrote: #6482
I was going to prove that the position was legal until I realised midway that you had seen further than I did and swapped the positions of some pieces as well.
The king/queen swap is legal for White but illegal for Black.
Can you find an 18-move proof game for this position with just the White swap?
#6483 is illegal but here's a way to make it legal.
n9531l1 wrote:
The king/queen swap is legal for White but illegal for Black.
Can you find an 18-move proof game for this position with just the White swap?
I found a 15.5 proof game
Aug 24, 2022
0
#6453
daStrwbrry wrote:
n9531l1 wrote:
The king/queen swap is legal for White but illegal for Black.
Can you find an 18-move proof game for this position with just the White swap?
I found a 15.5 proof game
14.5 switching the side to play or 15 without or 18 as requested.
Aug 24, 2022
0
#6454
Chessman265 wrote:
This is a common trick puzzle, because it appears in a semi-famous book, but is it possible for this position to be reached with white to move?
Yes, it's very easy. Here's a solution:
Aug 24, 2022
0
#6455
This position is illegal because there is no way to move the bishop without moving the pawns, and pawns cannot retreat.
DragonGamer231 wrote:
Chessman265 wrote:
This is a common trick puzzle, because it appears in a semi-famous book, but is it possible for this position to be reached with white to move?
Yes, it's very easy. Here's a solution:
Invalid solution, since you ended with Black to move. But a valid solution was posted over six years ago and has been reposted many times since.
