salfordlad
Well-known member
This is entirely the Committee's call, the rules do not tell the Committee how to set up their course. In my experience, most (but certainly not all) courses do not create local rules relating to the bunker base - meaning the default definitions in the rules apply. If it is artificial material then it is an obstruction.Where, as in OP situation, there is a rubber base to the sand, must the rubber base be declared an integral object, otherwise I could probe the sand and if I find rubber close to the surface I could claim free relief - though still only in the bunker. I know this was discussed at length a few years back but can’t recall if rule changed.