Illegal Position Contest!

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Avatar of n9531l1
EndgameEnthusiast2357 wrote:
#7590

This position doesn't give a side to move at the end. That's a good thing, because specifying the side to move at the end of a proof game is a violation of common courtesy. But unfortunately, the position is legal and doesn't belong in this thread.

Avatar of PeonDeReyEnigma

Totally illegal.

Avatar of n9531l1
PeonDeReyEnigma wrote:

Totally illegal. (#7593)

Too easy. No black king.

Avatar of EndgameEnthusiast2357

7590 is not legal. What was blacks last move?

Avatar of EvinSung

white or black

Avatar of EndgameEnthusiast2357

In 7590, Black's last move had to be with the king or b pawn. But any square the king could have come from would have been checked multiple times in a way that's impossible. So it had to be with the pawn, but if it was with the pawn, how could the king have gotten to a8 with pawns on b7,c7,f7, and g7? A contradiction.

Avatar of EvinSung

what if it is black to move

Avatar of EndgameEnthusiast2357

Then it should be legal.

Avatar of n9531l1
EndgameEnthusiast2357 wrote:

7590 is not legal. What was blacks last move?

#7590 is legal. Black's last move was Ke7-f8, followed (perhaps) by White's last move, Pd5-d6.

See #7593.

Avatar of EndgameEnthusiast2357

And how did the pawn check the king while the rook was already checking it?

Avatar of Kyobir
Avatar of Leither123

Legal

Black only makes 15 captures, and white has 15 expendable pieces:

Avatar of EndgameEnthusiast2357
n9531l1 wrote:

I posted this position a long time ago and was told it was too easy, but I still like it.

Why is this position illegal?

Just want to bump this one cause I still think it's the best one ever!

Avatar of EndgameEnthusiast2357

Avatar of PeonDeReyEnigma

Totally imposible/Illegal

Avatar of Leither123

Legal

Both sides have more than enough captures:

Avatar of n9531l1
EndgameEnthusiast2357 wrote:

And how did the pawn check the king while the rook was already checking it?

You need to think a little longer before posting. The pawn never checked the king, which was at f8 when the pawn made its final move.

Avatar of EndgameEnthusiast2357

^It's whites move though

Avatar of KieferSmith
Avatar of chekagain
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?

is the book the secret benedict soceity