You can find articles about mahjong game theory on the site of «Tesuji» club.

The site of the League has a section «Game Analysis» — feel free to send your questions with screenshots to: analyse@riichi-mahjong.ru, so that professional players of the League may analyse them and explain the best way to play in such situations. Game analysis is a great opportunity to understand your errors and weak points. If you'd like to see an analysis by the certain professional player, please mention this in your letter.