Who is your Nemesis?

Nick speaking,

Who do you hate? Who is your biggest nemesis? Who makes your blood boil the most?

Me...

Ork Warlord Ghazghkull Thraka!

Thraka joined to a squad of Knobz is something I face quite often, and having to deal with him is just plain Nasty!

Over time I have built up some tactics to counter him, and it's not all about throwing the hardest unit in your army at him to do the job! Of course expanding on these tactics to deal with any hard hitting attack unit key! But that's for another day....

Who is your nemesis and how do you counter them?