Human and computer vs computer alone How much stronger are human/computer teams vs. computers alone?  My understanding is that that advantage is enough to be decisive, especially in correspondence play, but just how large is it?
Well, humans have the advantage of identifying potential long term positional ideas where as computers are better at calculating quite complex positions. I predict most of the games would end up in draws but in some situations (specially endgames where you need depth as well as complex strategic plannings), human and computer partnership would triumph. A famous example would be the Caruana vs Nakamura game where computers never identified the queen sacrifice. https://www.youtube.com/watch?v=dMjj9SPnlBE. 

Also it's self evident that artificial intelligence programs such as Alpha-go-zero has both human like abilities (long term strategic plannings) as well as computer like abilities (deep calculations). So it would be a great example for you to see the games played between Alpha go zero and chess programs like Stockfish (https://www.youtube.com/watch?v=vP2J4WNN4Qg)