Dora
By Kenji Tanaka · Updated
Definition
Dora are bonus tiles worth one han each in a winning hand, without ever counting as a yaku. One indicator flips at the start of each hand; the dora is the next tile up from it, wrapping 9 to 1 and cycling within winds and within dragons. Red fives count in most modern rules, kans flip extra indicators, and riichi wins reveal the hidden ura dora underneath. Dora cannot make a hand legal on their own, but they routinely turn a cheap hand into a mangan, which is why counting the live dora is part of reading any table.
Dora
Dora (ドラ) are bonus tiles in mahjong that increase the value of your hand by one han each. They are determined randomly at the start of each hand and provide a significant scoring advantage when incorporated into your winning combination.
How Dora works
How Dora Works
At the beginning of each hand, after the wall is built and initial tiles are distributed, a dora indicator tile is revealed. The tile one rank higher than the indicator becomes dora for that hand. For example, if the indicator is a 3-bamboo, then all 4-bamboo tiles in your hand count as dora. If the indicator is a 9-character, then 1-character becomes dora (the sequence wraps around).
For honor tiles, winds cycle east, south, west, north, then back to east; dragons cycle separately: white, green, red, then back to white. So an east indicator makes south dora, a north indicator makes east dora, and a red indicator makes white dora.
Red Fives (Akadora)
In most modern rule sets, including the widely-played riichi mahjong variant, the three red fives (5-bamboo, 5-character, and 5-dot) are automatically dora in every hand, regardless of the dora indicator. This is a permanent bonus that exists alongside the standard dora system. Some rule sets, particularly traditional ones, do not include red fives as automatic dora.
Uradora and Kandora
If you declare riichi and win, you reveal additional bonus tiles called uradora (裏ドラ), which function identically to regular dora but are hidden until you win. The uradora indicator is the tile beneath the dora indicator in the wall.
When you declare a meld (kan), additional dora indicators may be revealed. These kandora (カンドラ) follow the same ranking system as regular dora and apply to your hand if you win after making the kan.
Counting Dora in Your Hand
To count dora, examine all tiles in your hand, melds, concealed tiles, and your winning tile, and identify any that match the dora tile. Each matching tile counts as one dora, and each dora adds one han to your hand’s value. A hand can contain multiple dora. For instance, if 4-bamboo is dora and you hold three 4-bamboo tiles, that’s three dora, adding three han to your hand.
Dora at the table
You’re playing riichi mahjong. The dora indicator is revealed as 7-dot, making all 8-dot tiles dora for this hand. Your hand contains two 8-dot tiles in your melds. Additionally, one of the red fives (5-character) is in your winning combination. When you win, you count:
- Two 8-dot tiles = 2 dora
- One red five = 1 dora (from akadora)
- Total: 3 dora = 3 han
These three han are added to your hand’s base value when calculating your final score.
Related Terms
Uradora
裏ドラ
Uradora are the hidden dora revealed only on a riichi win, flipped from beneath the regular indicators. They are riichi's lottery ticket: pure variance that can turn riichi-plus-nothing into a mangan. Declared kans add matching ura-kandora underneath their indicators too. Only riichi hands ever see them, which is a standing argument for declaring instead of sitting damaten.
Kandora
槓ドラ
Kandora are the extra dora indicators flipped whenever anyone declares a kan, working exactly like the original: the next tile up counts one han each. They reveal for the whole table, which is what makes kan timing a gamble: the indicator you flip may boost an opponent's hand more than yours. On a riichi win, the matching ura-kandora underneath are counted too.