A player calls a discarded tile while another player simultaneously racks the tile they picked; the player who called the discarded tile is entitled to it.
When two players simultaneously call the same tile for mah jongg, the player next in turn gets the tile.
When two players call the same tile, the player next in turn gets the tile.
A tile is discarded and misnamed, and two players call for mah jongg
When two players verbalize a call for the same discard, the player next has the first right of refusal unless the other player has also exposed tiles.