Originally posted by DeepThought
The terms of service allow opening books, opening databases and online databases of games between human players. So any online resource which differs from a book only be being online is fine. The terms of service rule out asking another person for advice. They also rule out using an engine to find moves during a game as well as the use of end game tab ...[text shortened]... tion. Essentially you can do research, but the only computation you can do is in your own head.
The ToS also implicitly rule out the scenario in
Thread 167519 in which one player gets two other players to play each other by proxy unbeknownst to them. That is, player X starts a game with player Y and one move later starts a game with player Z (colors reversed), both of whom are above his own rating. He then plays Z’s moves against Y, and so on.