Patience
Patience???

Sit on your hands. Before making a move, do a sanity check: Queen hanging? Any knight forks? Does my opponent need to recapture? In-between moves?
You could also get up and step away from the board a little bit perhaps.

Before the joining the tournament know what is the settings of the chess tournament. See if the time control will be blitz or normal games. In this case, you will know what kind of chess will you play.

When the tournament has much time, then don't try to play blitz chess as a practice. But instead, make a practice on time management in long time control.

OK, the time controls are 90 min/30 moves, and 60 min/ rest of the game.
I tried sitting on my hand, but whenever I play in tourneys, I calculate up to move 5-6, or 7-8 in complicated positions.
Here's an example, of the two games yesterday:
And this sad game: I was crushing!
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These are my games from yesterday. They are sad, especially that I had winning positions, but wasted them!
Today I'm playing again, and I'll try to use all of the advice given..
Wish me luck!

OK, the tourneys over and I tied for 4th place, with 4/6. As I won 3 games and lost 1 after the two games above. Thanks for the good advice!

My method for avoiding hasty blunders is to write my move down on the score-sheet before I make it, and then sit back and pretend to myself that the move has already been made on the board. Many times, in that brief moment of relaxation, I will immediately realize that the move I've written down is a mistake... but since I haven't yet actually made the move on the board, it's easy to correct: I just erase it from my score-sheet and re-think the position.

I actually do that, but usually people look when I am writing, so they can tell if I change the move.

I actually do that, but usually people look when I am writing, so they can tell if I change the move.
It doesn't bother me if they want to read what I've written down... they must break their own concentration on the board in order to do so.

I'm one of the people who live to blitz my moves, and can't sit still. So when I go to a tourney, I make bad moves, and I dont know how 2 stop. Can anyone help???
Yo eh oh chess master!

I'm one of the people who live to blitz my moves, and can't sit still. So when I go to a tourney, I make bad moves, and I dont know how 2 stop. Can anyone help???
If you find something that really works for you, please share it with the rest of us, because I am going through the same thing and still haven't found a way to stop it!

Writing down the move to the scoresheet before actually making the move is not allowed by FIDE ( rule 8.1) since the 2008 amendment.
I learned that just a few months ago, when my opponent (IM Adam Hunt) politely noticed me about this issue when we were playing each other at a team championship.
wow! That is a pretty screwed up rule if u ask me.

Another concern was that weaker players might write down a move in order to get feedback (e.g. shake of the head) from stronger team-mates, or kids from their trainer. I think that rule makes sense.
I'm one of the people who live to blitz my moves, and can't sit still. So when I go to a tourney, I make bad moves, and I dont know how 2 stop. Can anyone help???