The answer books to Essential Life & Death volumes 1-4 used to be officially available online for free on the Baduktopia website at http://baduktopia.com/asapro/board/list.htm?bn=pdf.

That page no longer exists, and the Baduktopia website seems to have been redesigned recently and is now completely in Korean, so I have no idea whether the answer books are still available, or where they are if so.

If any Korean readers here could take a quick look at http://baduktopia.com and determine the location of the answer books, if they're still available, that would be awesome. I'd love to be able to keep recommending these books.

(Yes, I know, the answer books are not strictly necessary, and at least for now they're still indirectly accessible via the Internet Archive's Wayback Machine.)

On my phone at work so I can't verify, but is this what you're looking for?

http://baduktopia.co.kr/asapro/board/sh ... 13&pkid=19

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be immersed

Yes, thank you! I'll update the Sensei's Library pages.