I have to say this is one of the most remarkable AARs I've ever read. I don't know if you still visit this AAR, but I've just spent the last few days with my mouth open at the speed and application of force you accomplished as Japan. Bravo!
Of course, many players go to lengths to understand and maximize the oil/resources HI/LI aspect of the game, as well as calculating risks regarding areas to bypass and assets/areas to invade. But this is a whole new level for me to see. It's remarkable. My hat's off to you. I'm going to bookmark it for a slow read and analysis in my game future for sure.
XENXEN, I personally think you needn't be so hard on yourself for conceding the game. After many years reading these AARs, I've come to believe people are much too quick to voice their disapproval when someone who, in their opinion, "quits the game early."
I say so be it, live and let live, learn from the experience and move on. I'm certainly not a fan of, say, forcing someone to sit through a real thrashing just to allow me the satisfaction of seeing the success of my plans; especially in a situation like here, where you clearly see the futility of future efforts for a very long time to come. It's probably best you both move on and find new opponents. As I said, what Linus has done here is remarkable, exceptional. I haven't seen planning and play like this by Japan since Admiral Laurent, Olorin, or koniu. In the face of such play: no harm, no foul. I think at some point, it's ungentlemanly NOT to allow you to concede gracefully.