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.
Illegal Position Contest!
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Aug 12, 2025
0
#8944
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
#8948
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.
Aug 13, 2025
0
#8954
prawnlevelplayer wrote:
Technically legal, but unreachable.
I bet this would make an interesting game of chess
white can go knight f3 and win the game
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?
What if white shuffles the knight to open
Aug 13, 2025
0
#8958
BigDoggProblem wrote:
MammothCricket wrote:
this position, but black to move...
RE: #8976
Legal, even with Black to move.
ah congrats you spotted it
lol i thought id just try to trick people
Aug 13, 2025
0
#8959
n9531l1 wrote:
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.
Legal:
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.