Strategic Starts and Interesting Tactics.

What are some of your favorite "this is almost too easy" tactics?

I like elective monarchy in Brittany. It's one duchy, so you're the only electorate until you get de jure drift - by which time you can have enough distantly related kinsmen as rulers in your realm it really doesn't matter.

I played a game as Brittany recently where I conquered Wales (at least the northern 2 duchies, Norway-England united manage to prevent me from all of it), and then went south and got most of Spain - it was a hundred or so years before any other territories drifted into my realm, and by what time I had destroyed the duchy title and granted out all three counties to content vassals, wash rinse and repeat (except for 2-county duchies).

I was the sole electorate for most of the game, and by the time I wasn't I was ready to hope on over to primogeniture - but not for a generation or two as I managed a eugenics program to shore my primary line up with strong, attractive geniuses.

I never did manage to make all three stick on my heir, oh well.