Penalty for Picking Up the Wrong Discard (Article ID 90)
Abstract: It is every player’s responsibility to verify they’ve made a correct exposure. If a player calls a tile for exposure and picks up the wrong tile and it noticed later in the game by another player, the player who exposed incorrectly would then have a dead hand. This ruling is not found in Mah Jongg Made Easy.
Question from a player: A player called a Flower for exposure but picked up a 1 Bam in error. None of the other players noticed her exposure and play continued, whereby that player then declared mah jongg. It was then noticed that the player had three exposed. Is that player dead?
Answer from the NMJL: “The hand is dead. It is up to each individual player to pick up the correct discarded tile when making their exposure. You are responsible for your own exposure.”
Source: National Mah Jongg League Bulletin Q&A 2012
Other answers from the NMJL:
“It is every player’s responsibility to see that their own exposure is correct.”
“It is each individual player’s responsibility to pick up the correct tile when making an exposure.”
“It is each individual player’s responsibility to pick up the correct tile when making an exposure. The player had an incorrect exposure when they declared mah jongg and therefore, their hand was dead.”
Sources for other answers: National Mah Jongg League Bulletin Q&A (1996 page 5, 1997 page 5, 2002, 2004, 2006, 2009, 2011, 2019) https://www.nationalmahjonggleague.org