Mahjong Dora and Indicator Guide: Conditions for Ura Dora
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While playing mahjong, you will encounter bonus tiles that increase your hand's value simply by holding them. These tiles are called "dora". For beginners who just learned the tiles, the relationship between dora and dora indicators can be a bit confusing. The face-up indicator itself is not the dora; instead, a set sequence determines that the next tile is the dora.
Once you learn this mechanism properly, choosing what discard to make and staying alert to opponents' hands becomes much easier. Let's first review the basic order for finding the matching dora from the revealed indicator.
Basic Rules: Finding the Next Tile from the Revealed Indicator
Figure 1 as text
Hand: 1m 2m 3m 4m 5m 6m 4p 5p 7s 8s 9s East East
Dora indicators: 4p (dora 5p)
Highlighted tiles: 5p
Notation: 123456m45p789s11z
In this diagram, 4 Circles is visible as the revealed tile. Because the rule states that the tile to score extra points is "the next tile after the revealed tile", 5 Circles following 4 Circles is the dora. Holding 5 Circles in your hand adds value and raises your score when you win.
For suited tiles (characters, circles, and bamboo), the next tile with its number increased by 1 becomes the dora. Take note when 9 is revealed: the rule cycles from 9 back to 1, so if 9 Characters is revealed, 1 Characters is the dora. Honor tiles (tiles with characters) also have a clear sequence: "East", "South", "West", and "North" cycle in order, looping from "North" back to "East". For the dragon group, "White", "Green", and "Red" cycle in order, looping from "Red" back to "White".
| Tile category | Revealed indicator | Dora tile |
|---|---|---|
| Suited tiles (standard) | 1 to 8 | Next number (2 to 9) |
| Suited tiles (terminal) | 9 | 1 |
| Wind tiles | East → South → West → North | Next wind (East after North) |
| Dragon tiles | White → Green → Red | Next dragon (White after Red) |
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The quickest way to master these concepts is to put them into practice. Play at your own pace against computer opponents, even offline.
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Dora Pitfalls for Beginners and the Need for a Yaku
Figure 2 as text
Hand: 2m 3m 4m 3p 4p 5p 6p 7p 8p 3s 4s 7s 7s
Dora indicators: 6s (dora 7s)
Highlighted tiles: 7s
Notation: 234m345678p3477s
In this diagram, notice the indicator tile 6 Bamboo. The target tile is 7 Bamboo, and because the hand contains 2 copies of 7 Bamboo, it carries the value of 2 tiles. Furthermore, this hand satisfies the yaku All Simples, formed purely with numbers from 2 through 8. As shown here, in mahjong you cannot win unless a yaku is present.
Mahjong has a rule called the "one-han minimum". No matter how many dora tiles you hold, dora itself does not count as a yaku. Therefore, you cannot declare a win simply by collecting dora without any yaku. When you are a beginner, do not rely solely on holding dora in your hand; aim for fundamental yaku such as Pinfu, All Simples, or yakuhai ("White", "Green", "Red", or your seat/prevalent wind) as you build your hand.
If you want to practice building yaku and managing dora on your own, play multiple hands against computer opponents in "Jankokushi", where you can try the mahjong fundamentals at your leisure.
The Privilege of Riichi: How Ura Dora Works
Figure 3 as text
Hand: 2m 3m 4m 7m 8m 9m 2p 2p 3p 4p 4s 5s 6s
Tsumo win: 5p
Dora indicators: 3m (dora 4m)
Highlighted tiles: 2p
Notation: 234789m2234p456s win 5p
This diagram shows a closed hand winning on 5 Circles by tsumo. Looking at the dora indicator 3 Characters, the next tile 4 Characters is dora, so 1 tile of 4 Characters in the hand counts as dora. If this hand had declared riichi and the ura dora indicator revealed after winning were 1 Circles, the subsequent 2 Circles would become ura dora, granting 2 additional han for the 2 copies of 2 Circles in hand.
Ura dora is a special dora accessible only to players who reach tenpai (needing 1 more tile to complete the hand) with a closed hand (without calling pon or chii), pay 1,000 points, and declare riichi. If you open your hand by calling, or win with a silent hand (damaten) without declaring riichi, you can neither reveal nor count ura dora.
- Declare riichi and win: You must declare riichi with an uncalled closed hand and win that hand.
- The tile beneath the indicator: Flip the tile stacked underneath the regular dora indicator; the next tile in sequence is the ura dora.
- Incidental high scoring: You cannot aim for specific ura dora, but having multiple copies match your hand gives an instant score boost.
Form the habit of reading the next tile from indicators, secure your yaku reliably, and enjoy matches while making the most of ura dora through riichi.
Frequently asked questions
When the dora indicator is 9, what is the dora?
The dora is 1. Suited tiles cycle from 1 through 9 and then back to 1, meaning 1 Characters follows 9 Characters, 1 Circles follows 9 Circles, and 1 Bamboo follows 9 Bamboo.
If I hold 3 dora tiles in my hand, can I win without a yaku?
No, you cannot win. Mahjong requires a one-han minimum. Dora tiles are bonus tiles rather than yaku, so you must complete at least 1 yaku such as riichi or All Simples.
Can any player check and apply ura dora to their hand?
Only players who declared riichi and won can check and use ura dora. You cannot reveal ura dora if you called pon or chii to open your hand, or if you won without declaring riichi.
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Why not try the yaku and riichi you learned in the mahjong RPG Jankokushi, sitting at tables with figures of the Three Kingdoms on a journey across the land?
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