Riichi Mahjong · 2 han（closed only）
Double Riichi in Riichi Mahjong: Rules, Han and Odds
In riichi mahjong, Double riichi (daburii) is worth 2 han: your starting hand (plus your first draw) is already tenpai, you declare riichi on your very first discard, and nobody has called chi, pon or kan before that. It replaces normal riichi — the two never stack.
The rules for Double Riichi
- Declare riichi on your first discard (the dealer after their 14 starting tiles, a non-dealer after their first draw)
- Nobody has called chi, pon or kan before it (closed kans count too); after any call, a first-discard riichi is just riichi
- Everything else is as for riichi: closed hand, tenpai, at least 1,000 points, at least 4 tiles left in the wall
- It replaces riichi: 2 han, not riichi's 1 han plus more
How Double Riichi is scored
The yaku, han, fu and points below are computed live by the same scoring code the game uses.
Double riichi · Ron
| Double riichi | 2 han |
| Total | 2 han 40 fu · 2,600 points |
|---|
Non-dealer, East round, no dora, no honba.
Double riichi · Ippatsu · Tsumo
| Double riichi | 2 han |
| Ippatsu | 1 han |
| Menzen tsumo | 1 han |
| Pinfu | 1 han |
| Total | 5 han 20 fu · Mangan · 2,000 / 4,000 points |
|---|
Non-dealer, East round, no dora, no honba.
Common combinations:
| Combination | Han |
|---|---|
| Double riichi | 2 |
| Double riichi + ippatsu | 3 |
| Double riichi + ippatsu + tsumo | 4 |
| Double riichi + ippatsu + tsumo + pinfu | 5 |
Double Riichi odds
Double riichi needs a tenpai hand in the first go-around. We shuffled the 136 tiles and drew 14 at random (a dealer's start, or a non-dealer's start plus first draw) 50,000,000 times and checked the shanten:
| Shanten of a 14-tile starting hand | Chance |
|---|---|
| Already complete (tenhou) | 0.0003% |
| Tenpai (riichi on the first discard) | 0.070% |
| 1-shanten | 2.3% |
| 2-shanten | 20% |
| 3-shanten | 44% |
Source: 50,000,000 random 14-tile hands.
- The chance that 14 tiles are already tenpai (discard one and you can riichi) is 0.070%; if they're already complete, that's tenhou.
- A non-dealer also needs nobody to call before their first discard, so the real rate is a little lower.
- In 40,000 computer hands on this site, double riichi came up 69 times: 0.21% of all wins and 0.45% of riichi wins.
To try your luck, open a table of free online riichi mahjong — the computers play with you and count the points for you.
FAQ
How many han is Double Riichi?
Double riichi is 2 han, closed only, replacing riichi's 1 han.
Is it double riichi if someone called pon before my first discard?
No. Double riichi requires that nobody has called chi, pon or kan before your first discard; after a call it's ordinary riichi.
Does double riichi get ippatsu?
Yes. Win within one go-around after double riichi with no calls and you add ippatsu; ura dora count as usual.
Related yaku
Riichi 1 han（closed only）
Declare it with a closed tenpai hand for 1 han: requirements, the rules after riichi, ippatsu and ura dora, win rate and average result.
Ippatsu 1 han（closed only）
Win within one go-around of riichi for 1 more han: the rules, what cancels it, examples and odds.
Tenhou Yakuman（closed only）
The dealer is complete on the deal: a yakuman of pure luck. Rules, tenhou vs chiihou, stacking yakuman, and the odds.
Try it at the table
Riichi Mahjong — Play Japanese Riichi Mahjong free in your browser against three AI opponents. Standard online rules with red fives, ippatsu and ura dora, a yaku guide, wait and furiten hints, and three AI levels. No sign-up.