Thanks for the feedback. 10 pieces is meant as the minimum amount of pieces , 10+ as in 10 or more. when playtest, since deployment is on the 4' side of the table, units could be outranged rather than hide in cover. Play was more fun and dynamic with less of the terrain. Most of the terrain pieces on hand a probably considered large to medium. I can see a scenario where more terrain would be needed if there are only small terrain pieces on hand.