Ryanpeikou

Conditions

• The hand must contain two different pairs of identical sequences (e.g., two copies of 1-2-3m and two copies of 5-6-7p)
• The hand must be fully concealed (closed only); any open call disqualifies this yaku
• Worth 3 han, closed only
• Ryanpeikou supersedes iipeiko; if you have ryanpeikou, you do not also count iipeiko
• Although a ryanpeikou hand can look identical to a chiitoitsu hand tile-for-tile, the two yaku are mutually exclusive; you score one or the other, not both
• The pair must be separate from the four sequences

Strategy Tips

• Ryanpeikou is extremely rare and should not be actively pursued. Instead, recognize it when you are already building toward iipeiko and notice a second pair of identical sequences forming.
• Since the hand must be closed, avoid calling chi even when tempting tiles appear. Maintaining a closed hand preserves the option for ryanpeikou and also keeps pinfu and riichi as potential additions.
• If your hand qualifies as both ryanpeikou and chiitoitsu in terms of tile composition, choose whichever interpretation gives you a higher score. Ryanpeikou at 3 han typically scores higher than chiitoitsu at 2 han, especially if you can also count pinfu or tanyao.