Where Did It All Go Right?

I don't blog about my games a lot, but I was quite pleased with two of my recent online games here, and feel proud enough to publish them.

I've posted two horrible losses before, so I think I deserve my moment in the sun...

Both these games were correspondence games against the same opponent. Beforehand I was rated slightly lower; afterwards, that position was reversed. 

Funnily enough both games ended in just 20 moves.  But in each game I can't figure out where my opponent erred. So where did it all go right?