Who has beaten a chess master before? (CM IM, GM, etc.)

I've beaten CM, NM and FM. An IM on ICC 15 min pool years ago. Beat an IM otb 5/0.

These victories are few and far between :)

I've never managed a draw against a GM.

Never, but i did beat Arena Title in FOA (AIM), twice on a 5 Minute Blitz!

I also managed to beat an FM on forfeit, but it wasn't very exciting after the 30 seconds of enjoyment, TBH :l

I BEAT 1 TOO

I have a 3:1 score against her :)

also I beat some GM twice in 1+0

Highest in standard plus a bunch in crazyhouse.

I "beat" a Candidate Master by resignition in a Casual Classical simul.

A few years ago I was Rook to Knight in an end game with a NM but my battery died! I'm still bitter to this day.