Sandburn - this game is very similar to Monaco Solitaire - and before spewing forth these facts of yours - May I suggest using a somewhat reliable source as your documentary evidence? Adjacent is an adjective meaning, “lying near, close, or contiguous; adjoining; neighboring”. Here it is in a sentence: “Things are adjacent when they lie close each other, not necessary in actual contact; as, adjacent fields, adjacent villages, etc.”.
Coincidently the wiki article does seem quite accurate and in no way states adjacent to mean only direct horizontal or vertical connection.
Oh yes, and to answer your question – Diagonals have been considered adjacent since approximately 1430
why come I cannot beat the boss level? I don't get it - is this kid really 14 - I am being outsmarted by a 14 yr old - guess our future isnt really that doomed afterall - but seriously - hover, right-click and then what?
 "Coy Card"){kind=icon}
 "ButtonHunt 3"){kind=icon}