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I've attached maps from AS.
DiD and Ruins are good maps. Both have qualities that make them enjoyable. After playing DiD many times, I can say that it's suitable for the Championship in its current form. Ruins should be improved. For some, they are new. For me, they are not anymore. I would add both to the list. I don't see the point in worrying about unfamiliar maps. There will be 2 months for testing, or more likely, even longer.
Guys, I don't understand what you're discussing – whether a map is suitable or not. Suggest all your maps. Then, choose 5 of them through voting or by judges' review. It's not that complicated.
By the way, we need to decide that each player can only participate in the map selection on one resource. Otherwise, we'll only be playing my maps or Oxygen's maps. Take my opinions on maps on HW with a grain of salt.