Worst Possible Move?

Hi everybody,

This is a thread where we try to find the worst possible legal move in different positions. I'll post the first position, and anyone else can feel free to post a position that you like.

So here's the first diagram, a pretty straightforward position:

What's the worst move you can possible make here?

f3 it accomplishes nothing, weakens your king and prevents the kingside knight from developing classically

F3

1. Na3 e5. Threatening double pawn on a3, best is perhaps 2. Nc4 Nf6 and d5 in the next move.

The worst possible move is the one that loses the game for you. If you don't know what you're doing there are plenty of "best" openings you can go wrong with and there are plenty of unsound and barely sound openings that are still used by players counting on their opponents ignorance of them. 

ECO A00 has the dregs de la dregs of openings:

http://chessopenings.com/eco/A00/

Worst possible move: white to move.

Ng4

Yes. I am having a bit of trouble making difficult ones.

Probably not any more difficult.

Was the idea Qxh8 stalemate (king has b8 though)? I can't find anything losing.

Oops, I forgot about b8 like you said. :)

[I would define the worst possible move to be the (unique) move that leads to the worst result in the fewest number of moves, with best play after this move. Is this sensible?]

@Sharrocks Kxe5 stalemate.

This position, constructed by Sampsa Lahtonen, houses the worst move possible in a legal game of chess.

White has 52 legal moves. 51 of them are mate in one, and the 52nd, well, it sucks. :)

oic. cool puzzle!

when posting puzzles it helps if we  are told which way the pieces are playing.

What do you mean by that?

Qe4+ isn't mate in 1 right?

Qe4 isn't legal because it puts the white king in check.

oops right