Hot answers tagged riichi-mahjong
Riichi Mahjong has a one-yaku minimum before you can complete your hand. While tsumo gives you a yaku if the hand is still closed, it won't give you anything if you've already opened your hand by calling melds. For further details, you can read the related answer here: Why couldn't this hand win with ron? Your hand, as it stands, doesn't have any yaku. ...
Only top voted, non community-wiki answers of a minimum length are eligible