Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Where I can find a fast smart pgn file format help ? You can find here the complete headache details of the format.
For a short good introduction (variations and NAGs included): http://www.enpassant.dk/chess/palview/manual/pgn.htm, the PGN Basics section.
Required, but never shown