First and foremost, I've already done some research regarding my question - web pages including, but not limited to the following ones, weren't able to answer my question to it's full extent:
According to various sources, chess games (the moves themselves) aren't protected by copyright of any kind. The consens in those articles is that the infringement starts with either advertising a blog, book, etc. (doesn't matter whether it's paid/free) with a player, i.e. "100 best games of Magnus Carlsen". Another opinion which has been shared frequently is that chess notations are eligible for copyright. That out of the way, let's dive right into the question itself:
Suppose someone wants to share a paid blog post including special games of different kinds of players. For each of those games he lists a snippet of the important moves (which is completely legal) and includes the name of both parties, i.e. the white player is "Magnus Carlsen", black player is "Anish Giri". Moreover, the event has been played in 2015 at the World Championship (details are fictional).
Is such a publication copyrighted? The games are taken by any database, e.g. https://www.chess.com/, https://database.chessbase.com/, https://www.chessgames.com/, etc. If it is, why do these sites have millions of games (they surely haven't requested permission by each player)?
To be more precise, what parts of the chess game are copyrighted? Am I allowed to share a selection of different games, including details like names, date, place and so forth - all public knowledge?