If you could change 1 chess rule....

Which one will it be?

The silly "Move before notate" rule, or something else?

A rule that never made sense to me was 3x repetition.

Why 3 times, why not call it a draw after the first repetition?

Allowing King promotion would be interesting. Would it change any opening theory?

"Move before notate" is actually a rule? A couple of teammates notate before moving and i never heard any complaints or warnings.

Martin0, maybe I should have specified, I dont want to change the gameplay, just rules that seem to exist for no reason at all.

http://www.chess.com/forum/view/general/does-anyone-write-notes-about-the-game-when-they-play-chess?lc=1#last_comment

queens should be able to move like knights since they are apposed to be the god piece

Wow, i had no idea.

So threefold repetition isn't gameplay?  Anyway, I think threefold repetition is a good rule as getting the same position twice might not be the case for playing for a draw while a third time probably is. 50 move rule is a more random choice of number. I haven't seen a single position where 49 moves are not enough, while 50 is.

Turn chess into Chess 960!  Openings, who needs 'em.

Aren't there endgames who need more than 50 moves for checkmate?

You are correct and I realized after posting that when there is a position that needs more than 50 moves you can just go some moves into the winning line until you reach the position that differs between 49 and 50 moves needed to win (assuming the last move was a capture or pawn move). Anyway 50 is still a random number.

When checkmate is reached, I would like for the squares on the board to flash like a disco dance floor.

Other than that, the rules are perfect.

You cant chose the opening, whatever you has to play is by Draw and both players play a game as white and other with black pieces in that opening  can be any existing opening even h3 and unusual opening and gambits.

You will not know until at the moment to start the games.

How about allowing both players to win if both kings get captured?

No draw offer before move 40....should be a rule. 

and 3 point for a win and 1 point for draw should be the score system in tournaments.

they have obviously not played against me, I have protested against 3 players for writing in advance...2 tournament leaders took me seriously.I think the last tournament leader was best friend with the player.

Yes, repetition needs to be 3-fold to give a chance to each player to keep on playing making an inferior move.

50 move rules I think it might have something to do with B&N mate. It can take up to like 34-40 moves with perfect play (engine), that would be hard to achieve in OTB by non titled players and /or with time pressure.

50 moves gives plenty of time. If it was e.g. 40 moves than B&N checkmate would not be 100% sure and this could affect gameplay.

Or maybe it's simply because 50 it's a round number.

B+N mate is possible in 33 moves with best play... but practicing with Deletang's triangles I've often found that in some positions I need 45-49 moves (allowing for a mistake or two along the way).

When a pawn is ready to promote you should be able to just put the desired piece on that square (instead of having to move the pawn there first) and then remove the little hero from the board to celebrate with its teammates.

Also like the 3 points for a win, 1 point for a draw idea.  And of course the flashing disco dance floor thing.