Mafia 90. The Tale of Oldforest.

Here's the thing... our checker and blocker are combined into one Neutral Domain. So, either we check (but then the Guardian stays at home), or we block and eliminate during the day based on "psychology."

I would use the checker in any case. Blocking is good when you know for sure, or strongly suspect, that the person you're blocking is up to no good. Otherwise, they might hide, and the Mafia could be busy with their own schemes, running around with healers. Because either they'll have a lot of evidence against themselves, which increases the chances of it being discovered, or if they're going to blow their cover, they'll do it all at once. The checker will be more useful in any case; the bad guys will simply have nowhere to hide. I would send the checker.