CWBP 2 Deciding the map

[Neyjour]

I really like Falconius' idea. Here's another option that expands on that, but slightly different.

Blue is mapped first. So you get to choose from a large square, a smaller square, or an even smaller rectangle (for pieces that fall around the very outer edge of the map).
Red cannot be claimed until all the blue areas around its (relevant) borders have been mapped.