Illegal Position Contest!
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If Black's king is added, then the position in post #230 is legal:
cobra91 wrote:
If Black's king is added, then the position in post #230 is legal:
but a black king is not added
Feb 7, 2017
0
#224
chadnilsen wrote:
Check out the earlier posts if you want proof that it is illegal.
I mean legal.
The position in post #234 is legal:
@Bronzetruck: Nice! These last two are your best yet. 
Here is a proof that the position in post #236 is illegal:
Since the pawns on e2 and g2 haven't moved, the bishop on f1 hasn't moved, either. It's also clear that the pawns on f2 and h2 haven't moved, so neither f1, f2, g2, nor h2 was ever vacant. Therefore, there was never a square from which the White king could have moved to g1 or h1... yet White's king is on h1 in the diagram! We've reached a contradiction, then, and can conclude that the position must be illegal.
And here's a proof that the position in post #237 is illegal:
Each side has 3 queens and 4 bishops, meaning that Black and White must have promoted (at least) 4 pawns each. However, there's a total of 32 pieces remaining on the board, so no captures have occurred... but this would make it impossible for either side to promote any pawns! Thus, we have a contradiction, and the position is illegal.
Now, for one of mine:
cobra91 wrote:
@Bronzetruck: Nice! These last two are your best yet.
Here is a proof that the position in post #236 is illegal:
Since the pawns on e2 and g2 haven't moved, the bishop on f1 hasn't moved, either. It's also clear that the pawns on f2 and h2 haven't moved, so neither f1, f2, g2, nor h2 was ever vacant. Therefore, there was never a square from which the White king could have moved to g1 or h1... yet White's king is on h1 in the diagram! We've reached a contradiction, then, and can conclude that the position must be illegal.
And here's a proof that the position in post #237 is illegal:
Each side has 3 queens and 4 bishops, meaning that Black and White must have promoted (at least) 4 pawns each. However, there's a total of 32 pieces remaining on the board, so no captures have occurred... but this would make it impossible for either side to promote any pawns! Thus, we have a contradiction, and the position is illegal.
Thanks!
Incredibly hard to look at board.
[COMMENT DELETED]
legal
