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This is impressive stuff… I always enjoy golfers who think outside the box.
I’ve been researching cross-handed or as the EU peeps would say cack-handed golf swing and there’s very little content on it. From a bio-mechanical perspective, it does a lot of good things in a swing:
- Creates a consistent shallow low point
- Sets the club on plane for a 4:30 angle of attack
- Inhibits the hands from flipping the clubhead
The Golf Channel “instructor” gives pointers to the cross-handed player then proceeds to duff one using his own technique. 
If there’s anything that irks me with this game is that the “experts” like George Gankas getting paid to teach and not actually be able to properly strike a golfball.
This makes me think of the “inner ring” and the “outer ring”. Some advocate a bent left arm so as to keep the left hand/arm as the inner ring through the swing. Because the right hand is lower on the grip it is the outer ring. If you overemphasize a straight left arm, you may have trouble closing the face. That right hand has to catch up to its place on the outer ring. I also find that with a real tucked right elbow, from the backswing into impact the left hand is the outer ring, but then there is a switch with the right hand on the outer ring just before the ball. With a cack handed grip one might avoid this switching - left hand is always on the outer ring.