Dora variations

The use of dora may be subject to variation.

Akadora

Akadora is the usage of red dora. Typically, they are the 5's to each numbered suit.

• One – Each numbered suit had one dora each.
• All – Every red dora tile in the mahjong set is used. A set may come with four red 5's: 1 souzu, 1 manzu, and 2 pinzu.
• Nashi – None are used.
• Option – Players have the option to select the use of akadora or not.
• Extra – More than one tile type is indicated as the red dora.

Kandora

After declaring a kantsu, another dora indicator is flipped in the dead wall. All four players can benefit from this.

• Sokunori – After declaring any type of kantsu, flip the next dora indicator immediately.
• Late – Timing on the kandora is dependent.

• After declaring ankan (concealed kantsu), flip the next dora indicator immediately.
• After declaring a minkan (open kantsu per call on a discard or per extension of a minkou), flip the next dora indicator only after discarding. If rinshan kaihou occurs, then the new kandora is not revealed.
• If chankan occurs, no kandora is revealed.

• Nashi – Kandora is not used.
• Start – One kandora is revealed at the beginning of each hand.

Kanuradora

Winning riichi declarers may flip the tile underneath each kan dora indicator and treat that as another dora indicator.

• Ari – The kanuradora is used.
• Nashi – The kanuradora is not used.

Uradora

Winning riichi declarers may flip the tile underneath the first dora indicator and treat that as another dora indicator.

• Ari – Flip the ura dora indicator.
• Nashi – Not used. Riichi declarers will know in advance how much their hand is worth.