Do you seriously need to ask whether using the TT is legal while playing a correspondence game? How many people on this site do you think would be able to use it if that were not allowed?
If you really think there could be an issue then search the forum for one of the other 163 threads talking about what you can and can't do while playing a turn-based game.
Are we allowed to do chess training while we have correspondence games going on ? For instance, I have some correspondence turn based games going on (you know NOT on the live chess portion of the site) and I did tactics trainer the other day (possibly yesterday) then I felt a little guilty because I did not know if this was technically cheating. I mean I don't think it is, I believe on this site people read articles, practice tactics, etc. (not during live games of course), so I was wondering if I am doing everything okay and within the rules? I can see how it would help me during my current games but in correspondes you can use the analyzer and analyze the game yourself, and I'm sure people get some help from chess articles, keeping up with current games, etc.
I mean I think its normal for us chess players to check chess news and this can technically help us if we have correspondence games going on, so does that mean we can't do that either?
At the time I didn't think I was doing anything wrong, but I just want to make sure I am allowed to study chess while I have correspondence games (just the regular games) going on? (I am not like looking for my positions in other games or anyting, just practicing chess and trying to get better, I realize that this is not okay in regular face to face chess and live chess, but I'm thinking correspondence chess is different).
So, in short, is using tactics trainer, and other chess training devices, and even reading articles and such, while I have correspondence games going, is that okay?