Commitment to Mah Jongg (Article ID 7)

If a player completes an exposure and then brings other tiles to the flat part of his rack thinking he might have mah jongg but declares, “I can’t do that,” he can return those additional tiles back to his rack as long as he has not verbalized mah jongg.

Placement of a Called Tile (Article ID 5)

It is preferred that you place a called tile on the flat part of your rack and not in your rack among your tiles. This will prevent picking up the wrong tile for expous

What Marks the Beginning of a Player’s Turn (Article ID 153)

One might think that a player’s turn begins when the previous player discards a tile but that is not the case. The reason for this is that turns can be interrupted when another player claims the discard to make an exposure. Therefore, a player’s turn officially begins when they either pick a tile from the wall or call a discard.

Commitment to Calling a Discard (Article ID 21)

A commitment to a called tile occurs when a player either exposes tiles on the flat part of their rack, placed the called tile on the flat part of their rack or placed the called tile on the sloping part of their rack along with their other tiles.