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I almost wanted to give up and ask for hint, until I clicked on the King and finally observed that he can castle.
Nice one !

Otherwise it's a hard puzzle as it is not likely in a 'game' situation that the king would not have castled until the final moves. I too solved this one by 'accident' by inadvertently clicking on the white king...

Well, it should be figured from the position of the pieces. Of course, few would think that in the endgame neither king nor rook have moved. It is difficult to pay attention to this detail.

The whole point of this nice puzzle is the castling. We tend to think in predefined patterns, and that is why we miss certain possibilities. And it is very well possible that castling is still an option in the endgame. It might not happen much, but it is certainly not impossible and for a puzzle it is a perfect setup. Nice one!

And i think that whoever complains about it, missed it too ...

dang i did nit think the king could still castle! totally took me off guard

yes

The nice thing about this puzzle is exactly the fact that practically no one considers the possibility of castling (including me). A solution in 2 moves therefore, seems totally impossible. And after a while you start doubting yourself "Why can't i solve it? It is supposed to be an easy puzzle ... ". Ha ha, i really like this one, because it is more than an ordinary puzzle, it is a deception!

I finally gave up. But I don't feel too badly. I set it up on Deep Rybka 4 960 x64, and It's been thinking for 45 minutes and hasn't found the solution.

At the beginning I felt a bit upset, cause I didn't´t find "the" solution, but then, I ended up with a LOL. And yes, we should have tried castling !!!
Oh, chess...

I do not agree. A castle is just one of the possible moves in chess, and as you say no one EXPECTS it in an endgame. And that is exactly what gives this puzzle its juice! The simple solution is hidden well. Without being personal, i really like to see all this embarrassment from people who failed to solve it. As i said before, it is more than a puzzle, it is a deception.

This problem forces some to think outside their boxes, and after all it can't be that much worse outside than inside. To react negatively to this unpleasant surprise is the natural reaction suggested to us by our intuition. The part where appreciation and enjoyment comes in just takes a little bit of extra conscious effort, an effort of which we all should be capable...

I take back my previous comment. Since the ONLY way to solve this is by castling, it make it the only single solution. When I initially posted, I made a poor assumption. My thought was that if this was set up in person, someone would have to instruct you on the position. But on second thought, that is not the case. You are correct. If there were more than one solution, it would be dumb. I take back what I said, lol.  

Try to find it in 3 moves without castling. I feel it s more interesting.

and so we miss the basics. Nice one I'd say.
With 27% solved at this time, this must be the lowest EASY puzzle solved percentage...

Correct! this is a more convincing and already known puzzle. You'll find it on many chess sites. But the one here, in two, is better marked as a wild variant of this one. Nothing wrong with M2, but this is unnatural, fallacious, and therefore non-chess.

This is another absurd situation. Another extreme. IMHO chess is a game of balance, of material, of position, of initiative, of psychology. Nerds and jerks don't play chess. Fischer apparently was a nerd, so was Tal, and even Kasparov - they found crazy solutions often. But look at their internal composure!! Kasparov's famous 22 move mating combination (Game of the century) shows a solid architectonic quality of his thought process. All opponent moves were forced, such was his ART.

AND THAT GAME DOESN'T ALLOW SUCH THINGS TO HAPPEN (AS SHOWN ABOVE).

By the same logic, again, it's non-chess (whether theoretically possible or not). If you can jump from a fence, you can also jump from a sky-scrapper. Would you?

Well, maybe 1. 0-0-0+ is not THE answer, but it surely leads to mate in 2:

1. ... Kc3 2. e6++
1. ... Ke2 2. c5++

It seems impossible to create a new GK puzzle with with castling or en-passant possibility. I wanted to create a puzzle where the first move is a pawn taking en-passant ... Does someone have a suggestion?

Castling and taking en-passant are both legal chess moves, and i do not see why a puzzle that makes use of them should be qualified as "non-chess".

puzzle #74961 has the same position as the board in your previous post, but castling is not possible here. I see that you created the board using FEN-notation, but how to make a puzzle with this possibility?

Thank you, i love pawn mates, especially when taking en-passant. But i am actually interested in creating a puzzle in which the very FIRST move is an en-passant move or a castle. It seems to be impossible, so i wonder how puzzle #5034 was created.