I think they have two staples: Downfall and In Your Face. As far as I know they play those songs everytime. Another one could be Living Dead Beat but I'm not sure..
I was kinda hoping that when they play those first shows in Finland, and since there are a lot of old school fans, they would play some really rare songs. But I didn't go to see them so whatever.. I still hope they will do a COB 20th anniversary concert and play extended versions of Touch Like An Angel Of Death, Black Widow and Triple Corpse Hammerblow with a symphony orchestra.