To the original question:
[color:"orange"]I've seen a report on blackjackplayers that use a system of counting cards to make millions, but the casino cals it cheating.[/color]
If the system they worked out runs on an electronic device for example, then I would call this equivalent to using a 3rd party program = cheating;
If the system worked on several individuals playing together (in memorizing and telling each other), I would also call it cheating, as the concept of the game is individual versus bank.
If however they worked out a system that one individual (trained possibly) could apply without any artificial or outside help - then I would say he outsmarted the casino, which then would have to change the rules, but cannot prosecute him for cheating.
In PC-games, taking advantage of bugs is IMHO not cheating, however the concept of the developpers merits some respect. Classic example here is the two potions/three sick people concept in DD. The game designers intent is clear - but people could not live with an unsolved quest, be it only for maxing XP-points at all cost - is stealing the potion back and curing the 3rd person really ethical?
