I have a question about the adjacencies.
A stone may not be dropped onto a cell that has no adjacent empty cell.
Does 'adjacent' to the @ piece below refers to the bullets (orthogonal connexions) and asterisks (diagonal connexions) around it, or only the bullets?
· · · * ·
· * • • *
· • @ • ·
* • • * ·
· * · · ·
I would usually tend to think it only refers to the orthogonal connexions, but the stones are said to be moved in a straight line either orthogonally or diagonally
, which suggests the diagonal connexions may be involved as well.
The question also arises as regards groups; may 'connected' stones be linked diagonally? I suppose they do not, because it would be unusual and thus would probably have been mentioned if so.