I have a question about Prime Place, though this is probably kind of clear:
I assume that "diagonal group" is always a full diagonal (goes as far as it can). In particular, a diagonal consisting of 1 and 3 would have no diagonal line at all, rather than a diagonal just in the cell with the 3.
Prime Place
You are right. Diagonal group consists of all the diagonal cells touching by corners (in the given diagonal direction). If there is a gap on the diagonal (cell not belonging to the grid) you may also have two separate diagonal groups in that direction.
prime place again
if a "group of horizontally or vertically adjacent cells" is composed of only one cell, will the rule apply?
I had the same question
It looks like a "group" can be any number of cells, including one. Am I reading this correctly?
Yes
Yes