Not allowed. 
Using an opening book while in a live chess game?
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Yigor wrote:
Not allowed.
Aww, guess i'll need to remember my theory xd
Mar 10, 2021
0
#4
While not allowed, it would be almost impossible to detect. Rating does not equate to depth of opening knowledge.
Kasparov probably knows every opening 25+ moves deep, but that does not mean a 2000 player knows every opening 15 moves deep.
I do not know Jack about the 4.Bg5 Grunfeld, but I know the French Poisoned Pawn draw line 25 moves deep.
And now both 25...Qh6+ and 25...exf5 draw, everything else loses, and they are two thin lines that Black must walk.
So if they see this by me as a 1900 blitz player and start accusing me of cheating (I have had this position half a dozen times on ICCF in the last year against 2300+ players), I would go viral on them for their false accusations.
So while illegal, it is hard to detect.
What's the point of knowing theory 25 moves deep as an 1900 player!? It's pointless, and for the most part completely useless.
Mar 10, 2021
0
#6
Not true! My 1900 blitz is also a 2220 ICCF correspondence rating and my over the board fluctuates between 1950 and 2150. I face many 2200+ players over the board as well. So yes, knowing it is useful! And I EMPHASIZE - KNOWING IT! NOT MEMORIZING IT! It does not do you any good to memorize if you do not understand it. If you understand it, when White plays something quirky, you already know if it is a legit sideline or a mistake!
ThrillerFan wrote:
Not true! My 1900 blitz is also a 2220 ICCF correspondence rating and my over the board fluctuates between 1950 and 2150. I face many 2200+ players over the board as well. So yes, knowing it is useful! And I EMPHASIZE - KNOWING IT! NOT MEMORIZING IT! It does not do you any good to memorize if you do not understand it. If you understand it, when White plays something quirky, you already know if it is a legit sideline or a mistake!
Thank you ThrillerFan and 0peoplelikethis for answering to my post. Knowing the opening is in fact pretty good, but as a beginner it's pretty hard to understand the meaning of each move, that's why sometimes in live chess games, I get that feeling to take a tiny peak to how the opening would go xd
So using your advice, I'll try to start from scratch and then stick with the opening principles. Might as well read that one book called "Logical chess move by move" to get some ideas on how to deal with the middle game. Giuoco Piano is currently the one I'm studying, and honestly it's not bad at all.
I'll be happy to listen to your tips that could help, and once again, thank you for replying to me!
So chess.com pretty much just has a rule for every unfair advantage that could get you banned. But I'm still curious about just one more thing. Is using an opening book while playing live chess allowed?