I am the owner of a couple of challenge caches in Aarhus, Denmark. They can be found in this list:
The concept is that you can choose to spend some time mapping your finds into which "card" you can potentially hold, and then use those cards to form poker hands. If you have the cards in your hand to form a given poker hand, you qualify to log the corresponding cache. A neat little puzzle, that for most people (1000+ caches found) won't take more than an hour or two to complete - not much work for 9 caches.
My question is then this: Is it possible for me as a cache owner to "opt out" of the challenge checker program? The difficulty ratings of these caches are based on people doing the work themselves. It would not be fair to those who have already logged the series to "downgrade" the difficulty rating of them if a challenge checker should arrive, thereby drastically reducing the difficulty.
I know that many other person-to-cache relations in Project GC are implemented through bookmark lists on geocaching.com. I am asking for the possibility as a cache owner to make a list for those caches that I would like to "opt-out" of the challenge checking program and then having it linked into project GC, much in the same way as f.ex. the FTF-list works.
Thanks for a great feature - with the hope that it can be even better by aligning the intent of challenge cache owners with the functionality of the site.