Over the years, the website's code and database format has evolved dramatically. Throughout a continual development process, significant changes would have likely frequently broken the compatibility of old game records. Likely, it became too tedious and/or difficult to continually convert old records, so now they lie in an incomplete/broken state.
Also, keep in mind that in the early years, there were many blatant problems in the adjudication engine that would likely make it impossible to convert an old game record in a manner that is fully consistent.
Currently, the engine is DATC compliant (see http://webdiplomacy.net/datc.php), except for a few known issues with auto-disbands for CDed countries and some apparent geography problems in the world variant. However, back in the day, numerous problems existed and were gradually fixed. For example:
- dual coasts were not implemented,
- a player did not win until they actually *built* 18 units,
- supporting convoyed attacks had no effect, and
- various complex scenarios from the DATC were not correctly handled.
This website has really come a long way. Kestas and numerous other volunteers have put in a lot of effort over the years in constantly maintaining and updating WebDip. The free, open-source code base has also enabled others (such as vdip, playdip, and facebook webdip) to build their own diplomacy sites as well. This site in particular has fostered a community that has organized leagues and tournaments, and even held a face-to-face tournament in Boston last summer.
It is really quite a remarkable open-source success story, and an incredible diplomacy gaming community that has built up around it.