@marcoen85 said in #20:
> The opening books that come to mind for me, are the "Mastering the ..." series by Pietro Ponzetto, e.g. Mastering the King's indian defence or Mastering the Spanish. Those books are about 30 years old by now but I doubt they are really outdated (I haven't read those books though).
The best opening Books ever made. I use them in conjonction with theoritical Books and it works wonderfully