I'll start:
Illegal Positions Compilation
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lol didn't know u were online whitefang
The position cannot be reached with legal moves. The black King is being checked by both rooks, and it clearly wasn't because of a discovered check, so the only way it could happen is, for example:
Black plays Ke6 (which is illegal), and white plays Re2.
Q : Construct a position where White mates the Black King on d5 with only two Rooks and a Knight
A :
Here an interesting one:
How is the last one illegal?
I don't seewhy xbigboy's position would be illegal: the last two moves could be 1. Nxe8 Kxe8.
The pieces couldn't have escaped if the pawns haven't moved.
Jeff Coakley's The Puzzling Side of Chess column sometimes features "Who's the Goof?" puzzles.
elo123 wrote:
The pieces couldn't have escaped if the pawns haven't moved.
They were captured on their original squares by Knights.
The answer to mine is in white text below (select with mouse to read it):
You can have 6 extra queens, you can have 2 extra knights, and you can even have an extra dark-squared bishop...but you cannot have all three at once. That would require 9 pawn promotions.
xbigboy wrote:
Here an interesting one:
That one would be possible, if either side could skip a move.
White cannot skip a move, because it only moves a knight, which cannot skip a move. Neither can Black, even though he can move the king, as the king is unable to perform a triangulation manouver allowing him to skip a move if the king is restricted to one rank only.
Black can skip a move by moving the queen, for example.
Of course you're right. White can skip a move with his Queen once enough squares on the first rank have been vacated, and so can Black with any of his heavy pieces. I'm not sure how I missed that. I guess I got fixed to much on all pieces except knights and the black king staying immobile.
btickler wrote:
The answer to mine is in white text below (select with mouse to read it):
You can have 6 extra queens, you can have 2 extra knights, and you can even have an extra dark-squared bishop...but you cannot have all three at once. That would require 9 pawn promotions.
But in that position you just have 6 extra queens and 2 extra knights. There's no extra dark squared bishop.
macer75 wrote:
btickler wrote:
The answer to mine is in white text below (select with mouse to read it):
You can have 6 extra queens, you can have 2 extra knights, and you can even have an extra dark-squared bishop...but you cannot have all three at once. That would require 9 pawn promotions.
But in that position you just have 6 extra queens and 2 extra knights. There's no extra dark squared bishop.
White normally has one DSB. In his position, he has two.
This thread is for posting illegal positions that are interesting, either because they are rarely considered, funny, not obviously illegal at first sight, etc.