The D'Arcy Konformist is a new member of the D'Arcy family. This version of the D'Arcy has a channel cut through the back to make it conform to the USGA and R&A's rules of golf. Putters with a flat backside that is not the same angle as the front side are considered to have two hitting surfaces. This rule was implemented in the 1970's so putters like the famous Calamity Jane were conforming at the time of Bobby Jones, but they are no longer conforming. So if you plan on playing in tournament golf or plan on posting your handicap you have to game this version of the D'Arcy.