What Does “Concealed” Mean on the NMJL Card?
 

A concealed hand is a hand that must be completed entirely by drawing tiles from the wall.

When a line on the NMJL card is marked Concealed, players may not call tiles discarded by other players at any point during the game.
 

All tiles in a concealed hand remain hidden on the rack until Mah Jongg is declared. If a player exposes tiles or calls a discard while attempting a concealed hand, the hand may be called dead.
 

Concealed hands are clearly labeled on the NMJL card, and the concealed requirement applies for the entire hand.
 

Published by the American Mah Jongg Association — the trusted home for American Mah Jongg players.