Don't Play Like a Student, Practice Like a Player

              "Unique Technique Practicing" ~ Critical Path Training Since 1983
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The Sakari Method
The big key when it comes to the left hand is to as much as possible, keep all the fingers postured so that they can accomodate any fingering or set of fingerings.

Of course, this will change slightly depending on the individual passages but this should always be the return position after a complex passage has been played and you're preparing for the next one.
                 The Left Hand
        "Ready For Anything"
                  Position