I know nothing about mahjong, so I was pretty much just chirping "Richi!" along with Youmu like a confused cheerleader.
With that being said, this still seems like it'll be a fascinating, hilarious sports manga. The comedic moments were on point, and Youmu 'Brain Empty No Thoughts' Konpaku is a pretty good protagonist for this type of setup. I'm still mildly disappointed that each chapter won't end with her losing her temper and cleaving the whole freaking board in half, though.
PS: Thanks, DB Scans. I shrivel up if I don't get a certain amount of Touhou per week, so you're a blessing.