Wanpai

Dead wall showing 2-pin as the dora indicator.

Wanpai 「王牌」 are the tiles used to form the dead wall. These tiles are set aside from the regular draw and discard play. Every mahjong hand session has 14 tiles, or 7 double-stacked tiles, set aside from the regular tile draw and discard processes. These tiles are considered to be out of play, hence the nomenclature "dead wall".

Use

Dead wall tiles are generally inaccessible, unless players call kan. Here, four tiles counterclockwise from the dora indicator are dedicated to kan calls. Even then at all times, the dead wall must be maintained at 14 tiles. In the event of a kan call, a tile is drawn by the player; and so a replacement tile from the end of the regular wall is added to the end of the dead wall.

The dead wall also holds the rinshanpai 「嶺上牌」, which are only accessible via calls for kan. They are the four tiles between the dora indicator and the first cut of the wall. In other words, they are the four tiles immediately clockwise from the dora indicator. For every kan call, a player gains access to the dead wall and draws one rinshanpai. After a discard, one tile from the end of the regular wall gets added to the dead wall, to retain the count of 14-tiles. If the rinshanpai produces a winning tile. then this draw invokes the yaku, rinshan kaihou.

Dora

Main article: Dora

The dead wall is always responsible for indicating the dora. Among the dead wall, one tile is flipped and revealed for everyone. This tile is assigned as the dorahyouji 「ドラ表示」, or "dora indicator". It is always the third tile on the top row from the initial wall break. Tiles marked as dora are indicated as the next tile in the sequence, as noted in the "dora order".

Arrangement

The fourteen tiles are arranged as follows:

1st kan draw	3rd kan draw	Dora indicator	1st kandora	2nd kandora	3rd kandora	4th kandora
2nd kan draw	4th kan draw	1st uradora	2st uradora	3rd uradora	4th uradora	5th uradora