Doing asian languages from transliteration is risky business, especially when you don't know the language, but...

1. Is the gai in gaiatsu the same root as in gaijin?
   
2. atsu means pressure? Is that (厚)? If so, this is interesting to me: when you're playing go, it is a good thing to develop atsumi (厚味), which is a quality of a local position which radiates influence and can be used to attack nearby isolated enemy stones.