Due to various circumstances that favored Obi-Wan, really Obi-Wan should have lost to Anakin by all accounts.
When I read the novel I don't get the idea that Anakin was really controlling this fight from start to finish. It seemed to me that Obi-Wan was really the fisherman here. You say "Due to various circumstances that favored Obi-Wan", but what about the circumstance of going up against someone with way more midichlorians, supposedly stronger in the Force, physically stronger, and younger? Do those circumstances not count?