Lets look at a random review of this book from Amazon:
"This is a very bad book. The author had not shown his knowledge in computer chess, everything was just random guesses. The author claimed he's a very strong GM+ level player in the book. Do you believe it? An untitled player suddenly playing at GM level?? Unless you believe Lyudmil Tsvetkov (the author) is really a grandmaster, nothing in the book should convince you. If the author can't even properly self-introduce himself, why would you think the contents are worth your time?
Throughout the book, Lyudmil is trying to show how he plays better chess than Stockfish, an 3000+ ELO chess engine. We don't know if the games are real, in fact my Stockfish 8.0 don't agree the Stockfish moves in the book. Apparently, the games are fake - anybody with a laptop can make a PGN with some random moves, then change the player name to "Stockfish".
The contents have not been proof-read - grammar, spelling mistakes everywhere, but that's not the problem. For example, the author claims the advanced French variation is a "forced" loss for Black. Are you serious? 1.e4 e6 2.d4 d5 3.e5 is a win for White?? Are you serious? Unfortunately, there're many other similar examples. The authors has made countless random guesses in chess.
There's no "secret" in this book, and there's no value. Please don't bother, and waste your time."
Do you know if a GM wrote that review?
No, but does that matter when the book is not written by a GM ?
Yes, it does.
A 1400-player like you can not review much stronger players, I think this is clear.
I am completely disgusted by you, I know some people are shameless, but to such a horrendous degree...
You have the right to review a book, when you have read it.
Did you read the book?
Why are you commenting then?
An unrated player like you who never played a single game of chess can NOT write a chessbook. Yes, I read the preview on amazon. The preface was enough to convince me what a scam it is.
So you did not read the whole thread, from where it is clear I have beaten grandmasters over the board?
How can you post in a thread, when you don't read the whole thread?
It go a long way to help prove the OPs credibility to this community if he actually played some games on chess.com and beat some strong players, just saying.....but I'm keeping an open mind. There are so many people on our forums here who have not even played any games, that we as a community have become numb to them.