This happened to my my friend, not me. But is funny.

He was in a dead-even endgame. Coming back from the restroom, he sees that his opponent had cheated, and made two moves. But he decided not to say anything. Because by cheating, his opponent was now in a lost position!

haha, that's one exception!

A gm resigned to me.

My opponent lost by time forfeit coz he had to drop his bomb in the toilet.

@ponz111: And did that surprise you? 

Yes, when it actually happened. Although I had done a little combo on him about the 50th move, it had been a long game.

For me, the weirdest thing to ever happen was an arrest of the player sitting next to me.

This happened in the 2002 Southeastern Open, which was in South Carolina, I believe Columbia.  Chris Mabe, back then an upper-1800s player, now a master, and I face in the first round, and we draw.  So we are on side-by-side boards for round 2, backs to the wall, so we could see the whole room basically because we were on the last row farthest from the doors.

A guy by the name of Scott Gru-Bell, who moved into the area around 1998 or 1999, I happened to notice peeked in the door to the tournament hall.  Just happened to look up at the time.  Thought nothing of it.  Scott started out looking like a legit business man.  Clean shaven and everything.  I even went to a few of his 1-day tournaments in 2000.  However, he had major issues.  He was supposedly the leader of the Patriot Party, which based on what others told me, I haven't done the research, was some type of White Supremicist group.  He was out to basically steal players from local chess club to try to run competing clubs specifically at the same time.  He did this throughout the Northern South Carolina and Charlotte North Carolina areas.  Then, anybody that tried to fight what he was doing, he would put up lies on message boards of the North Carolina Chess Association and South Carolina Chess Association Websites.  The North Carolina one wasn't secure at the time, and he would even put up posts under another person's name.  He put up a derogatory post with MY NAME on it, and occurred during the week, during the day, and weeks later, I get called in my by manager being asked why I'm putting up derogatory comments at work, and was about to write me up and give me a stern warning until I told him it wasn't me, and to have them do research on the IP address.  Turns out it wasn't me, it was this fool Scott Gru-Bell.

So anyway, he would also send annoying emails to people, and he sent one to Chris Mabe.  Chris responds with "Leave me the f*** alone", or something of that nature with the f-word in it.  Supposedly, at least in 2002, in South Carolina, all you have to do is say that someone harassed you and they arrest you.  Well, about an hour or two into the round, maybe 30 to 45 minutes after I noticed the peek in, police are coming thru the room, and proceed to arrest Chris sitting right next to me.  Everyone in the room has a "What the f***" reaction.  I mention I saw Scott peek in and he might have something to do with it, and the director gets him out of the cell during round 3.  Chris had to take a loss for round 2, and a half point bye for round 3.  He did play rounds 4 and 5.

Since then, this fool Scott grew his gray hair out really long, and he ran some stupid chess show on local TV in Charlotte where he was the chess wizard for a few years in the mid-2000s.  He is one of a very short list of people that I actually would not miss if he was dead!

That event/arrest in late October 2002 in South Carolina has got to be the weirdest and most surprising thing to ever occur at a chess tournament that I've attended, and I've seen plenty of hoopla and drama at chess tournaments!

Ok, slight correction.  It wasn't in Columbia, it was in Rock Hill, which is just over the state line from Charlotte, about 20 miles south of Downtown Charlotte.

Well I hope that Scott character got arrested for making a false accusation, and then got the crap sued out of him. There should be a law against that.

I never really saw much of anything exciting in my tournaments, other than witnessing an IM sending signals to one of his students during the game. The other player reported him to the TD, but nothing was done because the TD always bent over backwards for titled players.

OMG, where was this?  This way I know where never to go!  If the TD just let that slide after being reported, especially if I'm the one that reported it, I'd be chewing the TD's ear off, and so as to avoid being expelled, I'd be giving him explitives to the end of eternity after the last round!

As for those on my list of Organizers and/or TDs that I would avoid, and highly recommend all others avoid, that list is very short right now, but it looks like it will have a 3rd added to the list.  The worst ones are:

- Frank Berry - He's just an absolutely obnoxious human being.  I've had the misfortune of playing him twice, once in SC, once in Fort Lauderdale at the US Open (a win and a draw, respectively).  I understand he runs tournaments in Oklahoma

- The Cajun Chess Association - I went to 2 of their events.  The first one, in Orlando in October 2003, the guys that ran it were off and busy drinking or doing whatever else.  Nobody was there to direct.  In 2006, In Charlotte, after they changed management, the woman who did registration and book sales was nice, and appeared to be intelligent, but they bring only 1 director for a 120 player weekend tournament, and he f'ing plays in it!  You should NEVER have a tournament over 50 players without a NON-PLAYING Director!  Small little 10 or 20 player tournaments where the director plays, fine!  120 player tournament with 3 directors, one of which playing, fine!  But NOT 120 players, 1 director, and he plays.

So those are two organizers I won't play in tournaments at again.  I don't support jacka$$e$, and I surely don't support an organization that failed miserably twice, both due to things that were very much under their own control, not extenuating circumstances!

Lol @ Frank Berry. I've particpated in a couple of the Oklahoma events when my team (Texas) was playing the Okie team in a Red River Shootout. As bad as you think he is/was, his tournament was run quite a bit better than the TD I was referring to. I don't want to give the details (names) on the incident in question since I could be accused of false accusations myself, but I know the incident happened because I was friends with the victim. He even told me how the IM realized he'd been caught in the act, so the IM hurridly followed him as he went to report it to the TD just so he could deny it on the spot. Now I ask, how would he even know what my friend was going to complain about unless he knew what he'd done?

Anyway, my last run-in with the TD was when I finally beat his daughter in the final round of an open swiss. Every time he paired us, his daughter got white and would end up beating me. Even in the last game she got white, but I changed my opening repertoire and easily beat her. The TD then tried to log it in his computer as yet another win for her, but I caught it and refused to leave until I watched him correct the entry. He resisted for several minutes, but I wouldn't back down. After that, I never played in another one of his tournaments again.

Reb. to answer your question 3 wins over current GMs no losses or draws.

However two of the GMs were close to being GMs but not quite there when I won from them.

I don't know about IMs but it has to be plus. 

Maybe amateur champion?

That seems like the right thing if he's around ~2100.

The time control vs the over the board grand master were standard for USCF tournaments whatever that was back 39 years ago maybe 40 moves in first 2 hours?

Vs the correspondence GMs the games took approximately a year each.

I did notice I won from an "SIM" who was the only player I know to be an international master now. I was not aware of titles when I was playing other than semi titles such as US former champ over the board or winner of a correspondence national championship--which are not titles.

I needed 3 more games to get a permanent ICCF correspondence rating and unfortunately at first they were going to rate the prelims to the United States Correspondence Chess Championship where I did quite well in 3 preliminary sections and would have boosted my rating but then a new administrator decided not to count those games. I won 2 of 3 of those sections and scored 10 1/2   1 1/2 in the 3rd. This would have been more than 25 games rated--more than the 3 I needed..

So a very weird situation where I did not get a permanent ICCF rating due to 25 some games NOT being rated.  And earlier, some 39 years ago, I did not get my USCF master title [for a 2200 USCF rating] because 8 games I played [and I won all 8] were not rated....

@ThrillerFan  I was there that day.  A friend & I went to Rock Hill on a whim just to observe the tourney.  We weren't going to play so we were in no hurry to get there.  But we arrived just in time to see police in the hallway "escorting" Chris away.  Needless to say, we both wondered what the freak was going on.

A year or two later I played S. G-Bell in the Class Championship at Cherokee, NC.  Nice venue btw.  Anyway, our game was about dead even but I was in time trouble.  At one point he got up sporting his now graying long hippie hair and began to do some type of yogi stretching exercises.  Very distracting but still I tried to focus my attention on the board.  Sadly, my skills weren't up to the task because he beat me in a classic Lucena ending which he obviously had memorized by heart (as we all should),

  Anyway, he was a weird dude.