Iipeikou

Conditions

• Your hand must contain two identical sequences — same numbers, same suit (for example, two sets of 3-4-5 in bamboo)
• Your hand must be completely closed (no open calls)
• The two sequences must be in the same suit and have the same numbers
• Having two such pairs of identical sequences would instead be ryanpeikou (2 han, a separate yaku)

Strategy Tips

• Iipeikou often develops naturally when you draw multiple copies of consecutive tiles in the same suit. If you notice you’re holding pairs like 3-3-4-4 in a suit, keep an eye out for the tiles that would complete a double sequence.
• Since iipeikou requires a closed hand, resist the temptation to call chi on tiles that would break the pattern. The extra han from iipeikou is usually worth keeping your hand closed.
• This yaku combines well with pinfu and tanyao. A closed hand with two identical sequences made of middle tiles can easily hit pinfu + tanyao + iipeikou for 3 han, which is a solid score.