Assuming the ball is positioned before the clubface reaches low point and assuming an On Plane Swing :
a) if the clubface is square at Low Point, the clubface will be sightly open at Impact and you will strike the inside aft quadrant;
b) if the clubface is very slightly closed at Low Point, it will still strike the ball on the inside aft quadrant;
c) if the face is closed quite a lot at Low Point, the clubface will not strike the inside aft quadrant [and you will get a great big pull!].
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rwh
But the crucial point is that at Impact (not Low Point or Separation), the clubface must be open to strike the ball on the inside-aft quadrant. Even if the clubface is very slightly closed at Impact, it won't contact the ball on the inside-aft quadrant.
But the crucial point is that at Impact (not Low Point or Separation), the clubface must be open to strike the ball on the inside-aft quadrant. Even if the clubface is very slightly closed at Impact, it won't contact the ball on the inside-aft quadrant.
At Impact the sweetspot should travel through the inside aft quadrant which may or may not be the initial contact point dependant on the clubface orientation.... Quite simple really.....