Who was the strongest opponent that you guys have beaten?


Speed chess: GM Aleks Shimanov (was once #79 in the world). I beat him twice - though he crushed me many more times.
Slow chess: IM Martha Fierro (at 2411 FIDE, she was the highest-rated female player in her country). Defeated her in a simul.

Draw against Tal in 1988 in a simul at the World Chess Festival in Saint John NB.
Do you still have the game notation somewhere (or do you still remember it)?
Would be fun to look at.