Lafazar: If you don't want to invest the time, simply use this program, it will tell you exactly which moves to use to beat the game AI:
http://analogbit.com/software/infection_ai/
Ancient-Red-Dragon: I'm not sure "investing time" is necessarily a viable option. I've spent dozens and dozens of hours on this puzzle in my previous attempts. Perhaps investing time would only help in cases for someone who understands why he/she is winning or losing. But for someone who does not understand, then more time played might not result in better understanding/less losing.
Thanks though. I appreciate the link and your feedback. I'll probably use that link if I ever install T7G again, or else I'll just skip the puzzle via the library. Wouldn't the library skip option be even better than using the link though, since the library option is simpler and the effect on the game is identical to the link option?
Does Stauf say anything unique when you beat him on this puzzle?
That would be worth using the link for...
....unless....
... I've watched a video of this puzzle on youtube where Stauf is talking in a a super-sped-up Alvin the chipmunk type voice. That is certainly not how he is supposed to sound. Does the GOG version wreck his voice on this puzzle?
Well, basically you lose because you fail to capture more pieces than the AI. But thinking far enough ahead on how to simultaneously both protect as many of your own pieces and capture as many of the AI pieces as possible is just really hard for humans in general. Even the author of the linked Javascript AI does not like the game. He writes:
There are several problems with the game design.
1. Determining the best move manually is extremely time consuming and errors are very unforgiving.
2. Merely determining if you are winning is problematic because turns have such huge swings. Each player appears to be winning then losing big. It’s so bad that 7th Guest itself doesn’t know who is winning. Your character will often murmur to himself, “I’m going to have to start again”, when you are actually winning!
3. Because of the huge swings between the turns, whoever moves last often wins with a huge swing. This means that at the end, the optimal strategy is to jump around a lot in an attempt to avoid moving last. This can somewhat randomize the outcome of games.
source:
http://analogbit.com/2015/02/24/beating-the-7th-guest-infection-ai/
As far as I know there is NO penalty or consequence for using the library book. The developers wrote in the instructions that there WOULD be consequences, but as far as I know they didn't actually program any in.
There is no message or video on immediately solving this puzzle, but IIRC it unlocks a drama mask/video in the same room (Dutton & Temple) which you will be able to see even after using the library book.
ScummVM has an option to play certain videos double speed (mainly the walk and turn animations). Maybe early ScummVM versions accidentally sped up additional videos? As far as I know this does not happen in current versions of ScummVM and almost everything plays at the speed it should.