Which faction poses the greatest challenge for the Dwarves?

At the request of some forum users, I checked out the online tournaments and started reading the reports... I got so engrossed that I read until midnight. I found a lot of useful information for myself; some situations were familiar, and there was a lot of interesting stuff. I especially liked the post about Erling + Chaos + Phoenix Feathers. I advise everyone who hasn't been there to check it out; you won't regret it!