Calling a Tile While Playing a Concealed Hand  (Article ID 22)

Abstract:  The letter “C” to a the right of the hand, indicates one cannot call to expose tiles during the game.  When playing a concealed hand, you can only call a tile that results in mah jongg.   

Question from a player:  If you are playing a concealed hand, can you call for the 14th tile if it results in mah jongg? 
 
Answer from the NMJL:  “Calling a tile for mah jongg is the only time you may pick up a discard when playing a concealed hand.”  
 
Source:  Mah Jongg Made Easy (2020 page 15, para. 6); National Mah Jongg League Bulletin Q&A (2015)   https://www.nationalmahjonggleague.org