This just happened in one of my games. I didn't really see anything that White could've done to save it (though there may certainly have been something)...

Not too unusual.

Your clinical bad bishop vs. take-no-prisoners knight, well played by black.

(Like Chigorin, I root for the knights.)

Just curious, what was the opening?

g3 KID

Nope, you had that win tied up. Perhaps he COULD have held his King in so as to prevent yours from springing free.

I guess there were two reasons I thought it was a little odd:  1) it's a pretty open position (especially after the b-pawns leave); and 2) I put the f-pawn on the bishop's color (so I had to keep watching over it the whole time).