That's the problem with the power game. If the game gets extended, the more powerful pair will run out of steam and lose. This is true for both MD and WD since the 80s, when defenses suddenly got a lot stronger than the era before 80s. Thus, new winning tactics use manipulation and timing of the change of pace shots. And mobility too ......
Actually im quite surprised that olga konon surprised my dear wang shi xian that is quite unexpected though.