Microsoft Software Development Engineer - II interview questions

After six rounds interview, final failed. The position in STC at Beijing, I passed a on phone interview, then assigned three rounds onsite technical interview. After them, I had another technical interview and the AA interview. But even I finished this progress, still failed. I guess maybe I'm not good enough to beyond others. In fact, If you didn't have interview which not in the plan they give you, you was failed. Even you was finished whole progress, you still need better than other candidate.