My best was a 2195-rated opponent (I was then rated 2189).
A Heroic Defense in the Sicilian Najdorf - Kids, don't try this at home! - Chess Forums - Chess.com
Note the comment at the bottom of page 7 of that thread. PursuitOfHappiness2 is GM Mishra, the youngest FIDE Grandmaster in history. A "wow" from him is like getting a medal.
Zobacz te partie #chess: krzyniu68 vs astroduk - https://www.chess.com/live/game/94394498285 I won against a player with a rating of 2200.:)
my best win was against a tilted 2700 2600 li player
My best win was back in the late 90s, when I was playing a lot more, against "Fischer-Style" in the Chess Master 4000. I won 4 games against some of it's "GM" personalities, some played at 10-secs/move (for the computer, I was allowed my own time), and others at 90ms/40 moves (which gave an additional 90minutes on move 41 type thing). I don't recall the settings on this one though, but I think it was one of the 10s/move games.
When I mean the best win, I mean which opponent with the highest elo did you win against.
Post your games on how you defeated your highest elo chess player.
I'll go first (obviously). I defeated Rsnm39 with an elo of 1127 in a blitz tournament by time.
I'd like to see your posts!