like something out of Ma Xiaochun's 36 Stratagems
You mean Sun Tzu's?
For the pushing exchange, I believe Kono already thought about B's resistance, but maybe he believe that he could connect with his stones outside, but then realized that the aji in the center could turn really bad.
By the way, this game is typically Iyama's! Having rather a bad fuseki, and turn it around by outplaying his opponent. But I believe it would be hard if he plays international tournaments this way! In the exhibition game he lost to Lee Sedol before, his fuseki seems really bad, and his invasion/tenuki was really hard to understand. Thought he was able to create some complications later, he couldn't catch up against Lee.