I frequently see the claim that the opening book in the analysis board is the only one allowed in correspondence games. My understanding is that this is not correct and using any book is allowed: Win with the London System, How to Reassess Your Chess, Dvoretsky's Endgame Manual, etc. Also, using YouTube videos would be equivalent to using a book, and therefore allowed. This is all correct, isn't it? I think the FAQ should be amended to include such examples, or at minimum, this should be confirmed in this thread by a mod.
Also, using an endgame tablebase is NOT allowed, as implied by the tablebase's absence from the analysis board. And, for the sake of completeness, using an engine and asking a friend for help are both already explicitly against the rules.
Also, using an endgame tablebase is NOT allowed, as implied by the tablebase's absence from the analysis board. And, for the sake of completeness, using an engine and asking a friend for help are both already explicitly against the rules.