Open G tuning is an alternate tuning favored by Keith Richards and requires the guitar to be tuned to D-G-D-G-B-D. To retune into open G from standard tuning, drop the sixth, fifth and first ...

It is essentially the same as open G tuning, but with the second string raised by a semitone. So to tune from standard tuning, drop the first, second and sixth strings down a tone and then raise ...