The problem is rooted in the limitations of forums such as this dear one.
Compare with TMP: there a board can be 'embedded' in more than one 'subdirectory', thus the VSF board is accessible both from the '19th C.' and 'Science Fiction' forums.
Then, unlike TMP, technically forums don't allow cross-posting -yet a safety not to miss a post of interest or a potentially interested reader, and here moderators frown upon cross-linking.

The problem arises every time a combination genre (or setting) x period does not fit exactly with the defined content of a board (or would fit equally well in two boards:
http://leadadventureforum.com/index.php?topic=43045.0). 'Ben Franklin's War'
http://leadadventureforum.com/index.php?topic=43045.0 was posted on the VSF board, and thus was perhaps missed by some 18th C. gamers potentially interested. Anatoli posted his 'Strange Aeons in the 18th C.' on the Strange Aeons board, but '18th C. Gothic Horror' could equally appear in a 18th C. board; NOT in the 'hardboiled historical' Age of the Big Battalions' board, of course, but in the Pikes, Muskets and Flouncy Shirts: in my experience 18th C.
aficionados are an open-minded and tolerant kind, and accept that the borders between historical / quasihistorical / "what-if?" / Imagi-Nations / swashbuckling / 18th C. gothic horror / pulp / science fiction are desperately fuzzy. Besides, pirates not rarely encounter krakens, sea serpents, Deep Ones, King Kong, Dinosaurs, undead pirates or even all-female crews
http://www.markusrothkranz.com/pirettes/pirettes_video2.html (another form of fantasy), so...
'Carnevale' (Lovecraftian adventures in late 18th C. Venice) was mentioned in both the Gothic Horror
http://leadadventureforum.com/index.php?topic=33750.msg397408#msg397408 and Cthulhu boards, but would have fitted also in the Pikes, Muskets and Flouncy Shirts one, would it be only for the nice 'human' miniatures. 'A devil in Jerse'y

is Gothic Horror, and was posted on the corresponding board, but is set during the AWI: how many 18th C. players would peruse the Gothic Horror board in search of beautiful photos of an 'adventure game' in tricornes?....