kiss
Illegal Position Contest!
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BurgerEatersInc
Jul 17, 2025
0
#8941
Jul 18, 2025
0
#8942
Technically legal, but unreachable.
I bet this would make an interesting game of chess
Aug 10, 2025
0
#8944
Not sure why it posted my position twice but here’s one that’s not too hard but requires some analysis to prove illegal.
Little_Skib wrote:
Not sure why it posted my position twice but here’s one that’s not too hard but requires some analysis to prove illegal.
White needs five captures to promote the f and h pawns to the two promoted white bishops, and a sixth capture to remove the black bishop at c8. But Black is only missing five units.
Little_Skib wrote:
#8967
White's only retraction to uncheck the black king is Pf5xe6 e.p. after Black plays Pe7-e5, but before that the promoted white bishop was trapped on the 8th rank and couldn't move to c3.
prawnlevelplayer wrote:
Technically legal, but unreachable.
I bet this would make an interesting game of chess
I don't agree. Unreachable positions cannot logically [or technically] be legal.
Aug 12, 2025
0
#8950
White to move with black in check is a bit too obvious (clicking on the analysis board says white to move).
You know what I mean here.
Aug 13, 2025
0
#8954
Little_Skib wrote:
White to move with black in check is a bit too obvious (clicking on the analysis board says white to move).
but it refused.
Little_Skib wrote:
Is this position legal? Why or why not?
RE: #8972
Bc8 was captured on f3.
How to retract wN from c8? Not d6, which is an illegal check. Can't change position of bK either.
Must retract Bc8 home before retracting ...b7-b6, but can't do that with N in the way.
N cannot be retracted from c8, thus illegal.
MammothCricket wrote:
this position, but black to move...
RE: #8976
Legal, even with Black to move.
marcellothearcane wrote:
RE: #8973
Legal.
Little_Skib wrote:
Is this position legal? Why or why not? (#8972)
The black bishop left c8 before the white knight got there, in order to be captured at f3, so the knight arrived from d6. Before it reached d6, the black queen had moved to b8 to let Black escape a check by the knight. But after the knight reached c8 and the king returned to e8, the queen was blocked from returning to d8, so the position is illegal.
