from my perspective the first test for any article in wikipedia should be is it useful if it's not useful why do we have it in terms of inclusion criteria i believe there are many attributable sources on these chess openings as more books have been written about chess than any other sport the openings also serve a historic purpose as they were developed quite some time ago i do recall reading that a test for inclusion in general is will anyone want to know about this subject in ten years in the case of chess i believe many people will be interested to know about these openings in ten years as we are looking at openings that are well over years of age in many cases