General Discussiondoes playing LP increase hidden mmr?

If it did I would be vhs

Yes, it lowers and rises your Hidden MMR, but on a different scale, it also seems to have its own seperat hidden MMR.

What is lp?

yes

http://www.dotabuff.com/players/202060415/matches?date=&hero=&skill_bracket=&lobby_type=&game_mode=single_draft&region=&faction=&duration=&timezone=Asia%2FSingapore
lp played from normal to high skill (the rest are party games)
game i just played on unranked solo
http://www.dotabuff.com/matches/2353172116