How to use opponent's information for my own deduction?

[jatubio]

As it's a multiple players game and not a solo game, I'm pretty sure that studying opponents' board situations can help with my own deduction. I'm not talking about their investigation cards, but about their circles, squares and discovered evidence cards. But, honestly, I don't know how to use that information.

Some tips about this subject?

[yuniboshi]

While it's a known fact that each player can "see" the next / previous players' solution (based on seat order), most people don't keep it in mind or use it for their deduction. So it's very rare that it's the deciding factor that helps them come to a solution, and I personally don't use it to decide which cards to take (but I have heard some people may prioritize taking the card they know is in an opponents' solution to block a critical "hit" if they got lucky and randomly took the card). I think it's worse to play that way, because if you're blocking a card then you're committing to never hitting a critical card that could be in your solution.

[jatubio]

Thank you. I also read about that kind of "blocking". And I don't like very much that way of play. And I use the 'opponent solution' that I can see to my deduction discarding that cards as options on my own investigation. But I'll like also use their revealed 'non relevant' cards, and their circles and squares positions on my deduction and I don't know how to do it

[jatubio]

After some more playes, I found that you can't use others discarded cards as information. Because some one could get just one of the cards of your investigation only to stop you asking for that card. So, you can't count it as 'this card isn't on my investigation'.

Of course, you can discard the circled ones of your opponents from your possible choices. And you can use their boxes to check their advancing on their own investigation and know if you have to rush on yours or not.