But I'm not embarrassed of games I played when I was weaker, even though I'd be embarrassed if I'd play that game now.
I do have one OTB game in mind, I'll go find it in a few minutes. I was completely crushing a 1490, or at least I thought I was. Then I stuffed it up and blundered all of it away.
That was this season, which I closed with 1840 performance... :p

what has been your worst loss against someone that makes you embarassed