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# Hardest mate in one ever

• #21
hairhorn wrote:
This isn't a legal position!

Maybe the position in post #1 can qualify for the following forum topic: https://www.chess.com/forum/view/fun-with-chess/illegal-position-contest

• #22
Berkmaster wrote:

En Passant.

good find, berkmaster

• #23
If Q f6 then King takes knight
• #24
LilBoat21 wrote:
This puzzle is so difficult that even GMs can't solve it and its only mate in one

• #25

No mate in one, and this position isn't even possible.

• #26

No mate in one, and this position isn't even possible.

Read all the discussions in page 1 (plus post #22). The mate in one is conditionally possible, but since the position is given as a puzzle, we have to accept that Black must have played a two-square pawn push.

Indeed though, the position is not legal. The puzzle was just created to make solvers come up with ideas to get around the position - the purpose of solving puzzles is to learn ideas used so that players can come up with similar ideas in their games.

• #27
Paul_player wrote:
There is a mate. Qf6 checkmate. Its so easy. Even im not a GM. !!!

You know, look at posts 10, 11. KxNh6.

P.S. It is not mate.

• #28
Peppypranu wrote:
Paul_player wrote:
There is a mate. Qf6 checkmate. Its so easy. Even im not a GM. !!!

You know, look at posts 10, 11. KxNh6.

P.S. It is not mate.

I think that the reason why players think that Qf6+ is mate is that the knight is protected before Qf6 and players assume that the knight can never be captured as a result, leading to Qf6 being a checkmate, forgetting that the source of protection actually comes from the queen.

• #29

This puzzle uses a similar idea as to what has been discussed in the first page.

• #30

0-0-0

• #31

No mate in one, and this position isn't even possible.

The position isn't possible but there is mate in one

• #32

hehe... cute enpassant and mate

• #33

It's a clever puzzle but I didn't think it was particularly difficult.  You quickly see there's no mate in one.  That's when you know black's previous move must allow an en passant capture.  Then it's obvious.

• #34
Paul_player wrote:
There is a mate. Qf6 checkmate. Its so easy. Even im not a GM. !!!

You're really not a GM?  ;-)

• #35
hairhorn wrote:
This isn't a legal position!

Why not?  If white checked with the bishop and black responded with e5 (from e7), what's illegal about the position?

• #36
FBloggs wrote:
hairhorn wrote:
This isn't a legal position!

Why not?  If white checked with the bishop and black responded with e5 (from e7), what's illegal about the position?

Disregard.  I didn't notice that all of white's and black's pieces and pawns are on the board.  The only way some of those pawns could've ended up where they are is by capturing but nothing has been captured.

• #37
FBloggs wrote:
FBloggs wrote:
hairhorn wrote:
This isn't a legal position!

Why not?  If white checked with the bishop and black responded with e5 (from e7), what's illegal about the position?

Disregard.  I didn't notice that all of white's and black's pieces and pawns are on the board.  The only way some of those pawns could've ended up where they are is by capturing but nothing has been captured.

I also didn't notice that I responded to my own response.  In fact, I just did it again!  :-D

• #38

It is a mate in two actually.

• #39

1. Bxd4# The the black king is on b2 not g7

• #40
LilBoat21 wrote:
"This puzzle is so difficult that even GMs can't solve it and its only mate in one"

There are two solutions. 1. Bxd4 mate (the board is upside down, black pawns are moving up). 2. d5xe6 e.p. mate ( board is pla ced with white at the bottom, white pawns are moving up).

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