1. If you attack someone solo then it is almost certainly not a gank.
***Agreed. However, please keep in mind that if three people are attacking someone, even without planning it out initially, it is still a gank. Also, keep in mind there are successful ganks and failed ganks...the common factor? a gank.
2. An exception to (1) are characters like Ravon, Cabdru, Hunsobo, etc., who can, against certain foes, be considered a one-man gank squad. For them, consider:
a. Was the opponent killed after he (the opponent) initiated the attack? If so, not a gank.
***A gank, in my opinion, is if you initiate it (and not a raid). For example, if I attacked a hell group and died, I wouldn't consider that a gank..I would consider that being stupid.
b. Was the character acting in a role-mandated capacity, i.e. defending cabal or retrieving item? If so, not a gank.
***I agree with this. Raids aren't considered ganks.
c. Did the character intentionally (and repeatedly) seek out an opponent against whom he has a near 100% chance of success? If so, then possibly a gank.
***Eh, that's called multikilling or being an ass. Or padding your score.
3. For groups:
a. If the odds of killing the target with a group 1 smaller than your current group are near-zero, then it is most likely not a gank.
***Not really. A gank is a gank. No matter what reason you put down on it, it's still a gank. Just a failed gank.
b. If the odds of killing the target with the current group are near to 100%, then it is probably a gank.
***Agreed
c. If both (a) and (b) are true then it's a judgment call.
***Depends.
As I said before, it's with extreme luck that he didn't die.
For instance, if the group here was Inglor plus a transmuter, or Inglor plus a storm axe warrior, then I might be more inclined to say "gank".