What is the worst move in opening?

Pls Tell

I think probably f4, g3 for white  -- really bad exposure for the king.

I used to play 1 f3 a lot in 5-minute ... however I never followed that up with 2. g4 ...

dm

I would say f3 is probably the worst opening move.  You create a weakness in front of your king, take away your knight's best developing square, and give black the initiative.

f4 and g3 seems like a perfectly respectable plan for white. 1.f3 is probably the worst.

i9 is not played much at the highest level of chess.

I disagree.

I see masters play f4 and f3 a lot in the opening.

The worst opening move is... the one your opponent knows how best to play against!

1. f4 is known as Bird's Opening, and is certainly not the "worst". In fact, many grandmasters used to play it when it was in fashion, and some still do today. This includes the so-called "reverse leningrad dutch" system of f4, g3, bg2.

Actually, 1. f3 in and of itself does not lose a game, though along with other "non-developing" moves like h3, and perhaps a3, it does allow black at least an equal game from the start. It is true that f3 weakens the king and gives up the "natural" square for the king's knight, but it can support a center e4 push(either right away or delayed) and white's extra tempo can usually preclude fatal king trouble. In fact, some computers do rather poorly against 1.f3, for the simple reason that their opening books do not contain many lines for it. 1.f3 is also respectable for "bullet" games if both players have low lag times, when the physical act of moving pieces becomes a part of the analysis, as well as the opponent's delay when trying to "punish" the opening.

 The mirror opening 1..f6 though, called Barne's Defense, does have some serious problems with kingside weakness due to the lost tempo, especially against 1.e4. Nevertheless, even Paul Morphy lost against it; C'est la vie!

I'll put in a vote for the "Damiano Defense" poorly named after a master who said it was horrible.

1. e4, e5

2. Nf3, f6?

3. Nxe5, fxe5??  leading to disaster,

4. Qh5+

I put this ahead of things like fool's mate etc., because it initially looks perfectly good, and actually gets played sometimes.

a1 and h1.

a1, hi, f3

depends on the game.

Worst opening ever:

no duh

 I would say a4, h4, Nh3, Na3... I don't like g4 either, even though there is an opening for it.

a3, h3, f3/4 for white
a6, h6, f6/5 for black

a3/h3 for white ; a6/h6 for black - The reason is it effectivly weakens either side without the ability to bring the rook into the game.

 a slightly better play would be a4/h4 for white or a5/h5 for black, though I discourage this style of play because it primarily allows for white to develope his bishops with d3/d4 or c3/c4 effectivly trapping them into the corner, at which point they are foced into the middle of the board and your pawn structure can beat them back.

f3/f4 for white or f6/f5 for black are bad moves because they weaken the king side and make castling  kingside less effective, though if one is to kingside castle with an empty f file, the rook takes over control of the f file which may prove to be an advantage in the game. However the king can be cornered by the bishop. [example below] And this allows black/white to take advantage of the rook on the f file.

1. e4 is the worst opening move. It opens lines for your enemy to attack your queen and bishop, and as if that weren't enough, creates a space right in front of your king where your opponent can put his pieces!

a1 and h1 i guess. f4 although dangerous is not a bad opening, its the favourite of GM henrik danielson, and also mine.

Probably resigning.  Either that or disabling chat.

Rich, just because you have given it a name doesn't stop it being a bad move.  It probably is as bad as it gets for a first move.  It does so many bad things just in one move, and really doesn't have any redeeming features.  It gets even worse when you think about just how great the move 2.Nf3 is and how many good things that move does. 

hmm I see your fake fide rating has appeared again...