People used to do that crap all the time and then hide the move with their pen but it became disallowed.
Recording moves

People used to do that crap all the time and then hide the move with their pen but it became disallowed.

Technically in USCF it's not allowed anymore.
But so many people are used to it that TDs are allowed to use an alternate rule that allows it to be written before the move is made, and this rule change doesn't even have to be posted as I recall.

Rule 15A
. . . The player must first make the move, and then record it . . .
TD tip for this rule:
While the rule's wording indicates making the move first . . . it is a huge change for many players. TDs are advised to first (and possibly second and third) issue warnings to players that do not comply with this revised rule before enforcing any time penalties . . .
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Although it's not so new now... the 6th edition came out in 2014.

Fischer called those players cheaters and I agree.
Wasn't there a Fischer story where he drew Tal and after the game Tal asked why he didn't play a certain move, and Fischer's reply was "you laughed when I wrote it down."

Fischer must have changed his mind about the practice after that game. He didn't want the Soviets laughing at him.

Rule 15A
. . . The player must first make the move, and then record it . . .
TD tip for this rule:
While the rule's wording indicates making the move first . . . it is a huge change for many players. TDs are advised to first (and possibly second and third) issue warnings to players that do not comply with this revised rule before enforcing any time penalties . . .
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Although it's not so new now... the 6th edition came out in 2014.
I don't have the book in front of me but there is the alternate/ optional allowance you mention, in post 6, that can be used by the TD to allow it without warning or penalty or announcing it in advance.

I would complain if a TD in a tournament announced that it was fine with him.
WTH?

Why would it even be an advantage to write it down before the move is made? The clock would be ticking either way???....if you make the move, push the button and then write it down would that not even save you time???

The cheating type may also be looking for a reaction from his opponent to guide his choice in making a decision.
So you have to sit there and see this performance and of course you're curious what he wrote down but you have to keep your composure and a straight face. Then he covers up the move with his pen as if he's accusing you of cheating.
It's just so annoying and unnecessary.

Ah, I get it. I remember reading about Tal doing this, He wrote down a move, then angled the paper so Fischer could read it, to gauge his reaction.

No, Fischer wrote down his move without moving the piece.
Then Tal got up and had a laugh with another Russian GM.
A perfect reaction to that bs.

Okay -- now it makes sense to me.
There are similar (and equally as controversial and not universally adhered to) rules in poker, like not being allowed to make a false motion of moving in your chips in order to gauge the reaction of your opponent, etc.
Is it legal to write down your move before you make the move on the board?