Alois Podhajsky describes the three correct ways (2+2, 3+1 or 4+0) of holding double reins in his book "The complete tranining of horse and rider". He was head of the Spanish Riding School in Vienna and should know....

As it happens, though, I can't remember what he said about holding the reins 3+1, as I don't use double reins and there was enough other information to digest :blink: But I can check this evening

Mind, I've never seen anyone ride like this, including in the SRS video.
oops, cross posted with Stranger...who actually knew the answer :lol: