Civ 4. The Americans which was a Random AI out teched and outclassed both me and Garbageben. Even when I was nice to the American AI it kept on sabotaging my resources and mine alone. I didn't say a word nothing and Garbageben was just playing and learning while I was being attacked like a nutcase. Both of us attacked the AI and well I resigned since it was a hopeless situation. I guess the AI got fed up and used the strongest Civ to beat me at Civ 4, Revenged from Rise of Nations into Civ 4 to kick both our butts since I kept on killing off the AI in every skirmish maps.