I used to do that when I was DDK. for memorization purpose.
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Live game: yes
Correspondence game: no*
*unless analysis disabled in game options
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Hikaru no go was showing joseki dictionary used in live tournaments. 
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I would not do it even in Correspondence.
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The only way to be sure that you use only what you can memorize is to actually memorize it first and then using it by recalling only.
Hikaru was also “cheating” with Sai in Hikaru no Go
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OG AI
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It’s spelt S A I
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what if we ask permission to opponent
‘is it ok if I open joseki dictionary, I somehow forgot the continuation’..
then the opponent says
‘its ok. I will still win this game’
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I personally wouldn’t care too much if you are currently studying openings and want to double check that you’ve remembered something or even explore an option you’re not sure about. If you have no idea of an opening and rely on a book 100% then that does sound like unfair assistance.
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My opening is not in any opening book. Every attempt to just copy standard joseki will lead to the wrong choice.
[muhahaha]
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well, i wonder why you need to do this.
in my opinion, you could start like this, but i advise you to read a joseki book so you can understand the meaning behind each move.
joseki are joseki because people (and IA) studied them. So learning without understanding is like a shortcut. It would be just memoization, not understanding.
To memoize, there are plenty available tools (ogs joseki tool, josekipedia, joseki.cat, josedog, …)
But if you need understanding, just read books or watch videos about josekis.
Memoization become easier once you know good and bad shapes
Which IA?
sorry, IA does not study, it is a misuse of language that i made.
but IA are trained with a lot of played games, so it can evaluate moves.
IA even disapproved long time known joseki such as this one : Play Go at online-go.com! | OGS
I knew that was bad for white before AI.
the conclusion: looking joseki dictionary during the game can be considered as mini cheating (cheat action that won’t really hurt the opponent if they know we use joseki dictionary). if possible, ask permission to opponent first (same thing like when you ask undo)
If the game is unranked, or correspondence, that should be fine.
But otherwise, even if you ask your opponent and they agree, that would still be against TOS:
No Cheating or Computer Help
You can NEVER use Go programs (Leela, Zen, etc.) or neural networks to analyze current ongoing games unless specifically permitted (e.g., a computer tournament). The only type of computer assistance allowed is games databases for opening lines and joseki databases for corner patterns in correspondence Go. You cannot receive ANY outside assistance on live or blitz Go games.
Emphasis added by me. If you do use joseki dictionaries in live games, even if your opponent is fine with it, you will be at risk for receiving a warning.
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