Weirdest chess opening ever?

I think that it is the A4 opening.(Ware opening) It has also been played by Magnus Carlsen! Go to https://www.chess.com/blog/amowar4/carlsen-vs-hikaru-with-the-a4-opening to learn more.

I think a4 is a move that is inevitably played in many games, especially those based on book openings and sound positional play. I might be wrong, but I've noticed a pattern. So 1.a4 as an opening move isn't insane if you can somehow compensate for slower piece development and the aggression an opponent might exhibit if they believe a4 to be a mistake. You've got to know your theory.

If you think it's not the most absurd opening then what is?

I'm not saying it's not the most absurd, I think it's ludicrous. I'm just pointing out some reasoning behind the move.

My point is, opening explorers will fault the move, I know that Chessmaster does, but I think it's somewhat of a natural move if you consider the situation posted above.

Personally, a3 pops up a lot in my games, but the analysis engine tends to favour a4 in most situations. Its a positional choice that still bewilders me. I wish I had a set of examples to show.

I can imagine a little situation involving the Ruy Lopez where an early a4 might deter the push a6-b5. That's probably a poor example, but an example nonetheless. And there's also the obvious idea of lifting the rook and so forth.

The thing about these weird openings is that you need to prove that it is a useful move in the positions that follow. However, if the opponent is strong they should be able to steer the game into positions where it is not useful and thus prove it to be a wasted move, leaving them with some advantage. As for the weirdest what about 1.Nh3, 1.Na3 or 1.f3? I would probably pick one of those. 

I agree. Even F3 is such a weird opening.

i would say that f3 and h4 are weirder

Um I said F3

Yeah and?

The Sodium

1.Na3

(Chemical symbol for sodium is Na)

Some lines of the english defense, the vulture ,weasel and hawk variations of the benoni, Basman's creepy crawly.  I mean, you can find perhaps more upsetting positions out of the opening (some crazy gambit lines) but these have a reason for their madness even if they are not equally sound.

The Elshad for White.  1.c3 and 2.Qa4

Grob Opening, Symmetrical Variation, Coca-Cola Gambit

What a name coca-cola gambit

U know C3 has been played by Magnus Carlsen

ideally, thats best case scenario for white, to get to play a black defense where a5 is played  so you get an extra tempo, but the problem is, a5 is rarely an absolute must in a lot of black defenses, so a4 is hardly a advantageous tempo, worse black can keep in mind you already played a4 and try to take advantage of your bizarre move order (say with some weakening of the b4 square or ignoring any plan of queenside expansion).

white should stick to a pirc defense formation, where a4 is useful to either get c3-b4 going or to allow a more comfortable na3. but this is itself also somewhat limits you, for example, in some lines of the pirc, you want to play c5, allowing qa5+, here not only did you block the qa4 option, but you heavily weakened the b4 square in your move order.

maybe some queen pawn game, with a4 thrown in might not be so terrible but after d5 c5 shennanigans, even something like a london system might not be ideal since you have weakened your control of b4 and after a typical qb6 manuever, qb3 is not not available. Perhaps safest is a Colle or a Stonewall with a quirky a4 thrown in but this is not exactly an achievement for white.

1. a4 is nothing but trouble. At best, you get lucky and equalize without too many weaknesses. if you just want to play a waiting move with SOME original value 1.a3 is a better choice.

https://www.chess.com/forum/view/chess-openings/vote-for-the-most-dubious-real-opening

Interesting and cool attack 

I've used a4 in several of my games, the theory is similiar to the owen's defense, but you use the a5 move to lose a tempo.