The best FIDE rated opponent you have defeated.

Let's start with me.  The highest rated player I ever defeated was 1503. 

In my first tournament I had a won position against a 2000 rated CM, computer gave me +4.5 edge but I still lost.

however I drew a 1855 guy and lost against 4 people with 1500-1600 because of blunders.

1984...thats all George Orwellish....

In official over the board play (USCF), I've defeated IM Michael Valvo (2440 FIDE). In online blitz, I defeated Alexander Ipatov (+2650 FIDE). I also beat GM Evgeny Vasiukov (~2500) in blitz, who is a bit of a chess legend. He once trashed Fischer in blitz. Of course, when I played him, he was quite a bit older. 

In a simul, I defeated GM Larry Christiansen (+2600 at his best). 

I beat a player rated 2195 FIDE and only 1900 USCF. Meanwhile I was 2000 USCF and 1600 FIDE. A very odd situation. His FIDE rating was not based on many games and his USCF rating was clearly much more indicative of his strength than his FIDE.

I've beaten a couple more legitimate FIDE expert-level opponents and drawn a handful of FMs (some actually 2300 FIDE, others formerly 2300 FIDE).

My FIDE rating is currently in the low-to-mid 1800s while my USCF rating is 2001. I have certainly played many more USCF rated games than FIDE games but I wouldn't say my FIDE rating is too far off my skill level unfortunately. Could be wrong, always working to get better.

Hv defeated 3 titled players all online though

I've defeated a FM from the Middle East.

The highest-rated player I've drawn with was ranked 4th in the world at the time. Granted, it was just in a simul.

Win, 1559 FIDE. Draw, 1915 FIDE. Loss, GM Antonio Romero. 

Approximately 2100. And I've had a draw with a 2300 FM.

1640 when I was 1320

1678

I won against a 1900+ in rapid.. thats my best.. next best is few games against my friend who is 1700+..

A 2135 in classical.

1400 approx

Wow, these wins are truly great!

I once won a blitz game against a player once placed 3rd in the Swedish championship. Not that impressive I suspect...

hi I am train blitz rating tournament help please all

Nope, it IS impressive, as compared to mine.

Doesn't it depend on who that person was? I once finished 12th in a national championship (G/60). A high finish in a Swiss tournament is often down to the luck of pairings.