Joker Exchanges When Playing a Concealed Hand (Article ID 77)
Abstract: A player is entitled to doing a Joker exchange regardless of whether they are playing an exposed or concealed hand. This ruling is not found in Mah Jongg Made Easy.
Question from a player: Can you exchange a joker from an exposure if you are playing a concealed hand?
Answer from the NMJL: “Playing a concealed hand does not negate doing a joker exchange. You are only prevented from calling a discard when playing a concealed hand unless the tile is for mahjongg.”
Source: National Mah Jongg League Bulletin Q&A 2020
Others answers from the NMJL:
“You may take a joker from any exposure whether you are playing a concealed hand or an exposed hand.”
“A joker exchange always may be claimed whether playing either a concealed or an exposed hand.”
“You may do a joker exchange when you are playing a concealed hand or an exposed hand.”
“It does not matter whether you are playing a concealed hand or an exposed hand. You may always replace a symbol tile for an exposed joker.”
“You may always exchange a tile for a joker, regardless of whether you are playing a concealed or an exposed hand.”
Source for other answers: (2004, 2010, 2011, 2018, 2019) https://www.nationalmahjonggleague.org