This idea illustrates the stratagem of a major high against a 'positive' news flow.
Since the Vol expansion is necessary for the defence of the highs, an exchange at 21/22 is the way we defend. You should memorise this move of forcing our opponent to make up their mind, after clearing the positivity newsflow around vaccine and etc we are going to have 'diversion' introduced. This should be considered playing against, contested elections and uncomfortable positioning from stimulus expectations leaves the entire board looking vulnerable.
Thanks as usual for keeping the feedback coming 👍 or 👎