a Kong is a meld of four identical tiles For example, you may form a Kong of 4 Green Dragons, or 4 Six of Bamboo, and so on An extra tile must be picked from the wall when a player forms a Kong, to avoid leaving an irregular number of tiles in the player's hand, preventing them from completing mah jong
n Four identical tiles When a player completes a Kong, it is placed on the table, with the two middle tiles face-down if it was a Concealed one The player then draws a Loose Tile, and discards normally Open Kongs may be Robbed to complete a winning hand