Riichi Mahjong Strategy Books
https://dainachiba.github.io/RiichiBooks/
This ebook by Daina Chiba is an excellent, thorough resource for learning Riichi mahjong. It’s hard to find such good material in English. You need a pretty strong understanding of the fundamentals to follow along with many of the sections, so this will probably become something that I revisit many times as I improve my game.
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