Riichi yaku statistics
We counted every yaku in 411,235 Riichi hands played on Mahjongo (May 2026 – October 2026). 52.0% of hands include Riichi. 29.1% of hands include Yakuhai. 1 in 27 hands is won with Seven Pairs. 1 in 935 hands contains a yakuman.
Most common
#1Riichi52.0%
#2Yakuhai29.1%
#3Ippatsu13.5%
#4Fully Concealed Hand12.5%
#5Pinfu12.4%
#6All Simples11.1%
#7Seven Pairs3.7%
#8Pure Double Sequence2.9%
#9Half Flush1.5%
#10Mixed Triple Sequence1.4%
Rarest seen
#1True Nine Gatesonce
#2Thirteen-Wait Thirteen Orphansonce
#3Blessing of Heavenonce
#4All Greenonce
#5Single-Wait Four Concealed Triplets2 times
#6Blessing of Earth3 times
#7Nagashi Mangan3 times
#8Four Little Winds6 times
#9All Terminals6 times
#10All Honors9 times
All 42 yaku
See the full Riichi yaku list#YakuHanShare of handsHow often
1Riichi152.0%1 in 2
2Yakuhai129.1%1 in 3
3Ippatsu113.5%1 in 7
4Fully Concealed Hand112.5%1 in 8
5Pinfu112.4%1 in 8
6All Simples111.1%1 in 9
7Seven Pairs23.7%1 in 27
8Pure Double Sequence12.9%1 in 35
9Half Flush3 (2 open)1.5%1 in 66
10Mixed Triple Sequence2 (1 open)1.4%1 in 71
11All Triplets21.2%1 in 83
12Pure Straight2 (1 open)0.8%1 in 130
13Half Outside Hand2 (1 open)0.5%1 in 196
14Under the River10.5%1 in 212
15Three Concealed Triplets20.3%1 in 290
16Full Flush6 (5 open)0.2%1 in 471
17Under the Sea10.2%1 in 483
18After a Kan10.2%1 in 536
19Double Riichi20.2%1 in 539
20Robbing a Kan10.096%1 in 1,044
21Thirteen OrphansYakuman0.082%1 in 1,220
22Fully Outside Hand3 (2 open)0.08%1 in 1,250
23Little Three Dragons20.027%1 in 3,672
24Twice Pure Double Sequence30.013%1 in 7,477
25Triple Triplets20.011%1 in 9,139
26Big Three DragonsYakuman0.0097%1 in 10,281
27Four Concealed TripletsYakuman0.008%1 in 12,462
28Three Quads20.0036%1 in 27,416
29All Terminals and Honours20.0034%1 in 29,374
30All HonorsYakuman0.0022%1 in 45,693
31All TerminalsYakuman0.0015%1 in 68,539
32Four Little WindsYakuman0.0015%1 in 68,539
33Nagashi ManganMangan0.00073%1 in 137,078
34Blessing of EarthYakuman0.00073%1 in 137,078
35Single-Wait Four Concealed TripletsDouble yakuman0.00049%1 in 205,618
36All GreenYakuman0.00024%1 in 411,235
37Blessing of HeavenYakuman0.00024%1 in 411,235
38Thirteen-Wait Thirteen OrphansDouble yakuman0.00024%1 in 411,235
39True Nine GatesDouble yakuman0.00024%1 in 411,235
40Four Big WindsYakuman0%not seen
41Four QuadsYakuman0%not seen
42Nine GatesYakuman0%not seen
Source: Mahjongo, 411,235 Riichi hands in rooms against bots with at least one human player, May 1, 2026 to October 31, 2026. Counts include hands won by bots. Updated monthly.