which is that one bad move you made that changed the entire match and you regret ?

d4 or e4, I remember it was one of them.

But i do remember one move in particular. Was in a state high school championship. My opponent was a bit higher rated than me, and i had never beaten him before.

 But after a long, hard-fought game, we emerged into a king-and-pawn endgame, where is was better. Would this be my chance??

We both had 3 pawns on the kingside. But I had an extra c-pawn as well.

Well that's easy to win, right? 

Wrong.

I blitzed out a king move, which I immediately realized wasted a tempo.

After my opponent moved, I stared at the board for 40 minutes, not believing it was a draw.

Our coaches were in the other room, moving the pieces, analyzing our position. They swore I could still win.

But they were wrong. The game wound up a draw.

All on account of one stupid move, I will never get back.

lol you are funny . 

man i hate stalemates too they are the worst

Or they are best if you are losing.

true but only when you are loosing but when you are winning they are worst

This comment put a smile on my face. Well said Fred!

mine too

I remember one time is was hanging out with my friend. I got bored, so got out my laptop, and started playing some chess.com.

I was sitting on the couch, working my mouse on my knee.

Game was going very badly. I had lost a rooks. But I did have a little compensation for it. 2 pawns, and a stronger pawn center. Also, my opponents knight was trapped on the edge of the board, with no way he could defend it. If I could somehow get my queen over there, without allowing him to inftrate me in the center, I might have an almost playable game. So after a bit of maneuvering, I thought my shot had come. I could win his knight.

But one of my buddy's was sitting next to me watching me play. Even worse offering suggestions.

As I was double-checking my calculations, he says "move this piece over here!"

He leans over me, laying his fat gut over my hand and mouse, pointing at the screen.

I watch in horror as the mouse picks up my queen, drags it across the board, and drops it on a square where it could be taken by any of 3 pieces.

I resigned before my opponent could even reply.

I

It was state finals for a 15|0 rapid interschool swiss tournament for years 7-9, round 7 out of 9 and I was the only player who was on a 6/6 after upsetting two players from one OP school that I won't name because of blunders they made. My opponent was also from that same OP school who was 100 points higher in rating than me and he was on 5.5/6 as he was having a very good tournament. I had completely outplayed him in the opening and he fell to a tactical knight fork. Back to this position and it was my move. Here, I played one of the worst moves I could have made.

-Re1??.

This caused him to instantly play Bb5+! which is a forced mate in 3 at most.

In the end, I came 6th after losing the next and winning the last. But I could have earned a medal if I won since I would have faced the number one seed which would drastically increase my tiebreak score. My opponent came second. This position still pains me to this day.

Anonywin, that was very unfortunate!

My first game on OTB. Being the only girl in the tournament, a few spectators and some players came over to watch my game which made me very uncomfortable. At mid game, position was about equal. I moved my Queen and dropped it on the wrong square and saw that his bishop could capture my Queen. I was disgusted (maybe more embarrassed) and immediately resigned to the surprise of my opponent and everyone else watching. To my horror, I looked at the board again and realized that if he captures my Queen, he would be mated on the next move...Tipping my King is the worst move I've ever done! 

OUCH, Isabella.

I remember one of my first tournaments ever. I had the black pieces against a friend of mine. He was 200 pointed higher rated than me.

Well the game was going surprisingly well. I managed to get a roughly even middlegame. 

Then it comes my move, I need to decide what to play. First move I consider is Qb6. I look, and see it allows my opponent a series of exchanges, that would leave me with SIX (!) Isolated pawns. So that idea was scrapped in three seconds. So I move on to another idea. How about Qe7 instead? I analyze it for about 4 minutes, keep looking it over, doublechecking it, and finally decide it is the correct move to play in this position.

So my hand reaches out and plays (you guessed it) Qb6???

*facepalms*

I keep a tiny drill sergeant tucked behind my ear, for just such occurences.

Should i ever freeze up like that, he jumps out, and screams "ON YOUR FEET, SOLDIER!!!"

I played in a tournament (4 rd., one day) after working 3rd shift (they actually held up the 1st round for 1/2 an hour until I showed up).  In the last round, I was black, playing for second place.  I had a comfortable position, maybe a little better, when I "hit the wall", as distance runners say.  I had no idea of what was going on; I couldn't calculate anything, I knew how the pieces moved, but they didn't mean anything to me.  This went on for 5 moves, and when the "mist" finally cleared, I started swapping pieces as fast as I could and offered a draw, which was accepted.  It's the only time that that has happened to me, and it's a scary feeling.

Once was exchange up six months ago, in state scholastic championship. Piece and pawn up, but if you looked at position then you would know that I was very unlucky. If I had won, I would have been in third place, but I got a draw since my king had no cover, even though many pawns existed! 

that is so sad . keep trying buddy you will beat some other championship