Chiitoitsu Yaku: Seven Different Pairs

Chiitoitsu ("seven pairs") is the one standard hand shape that departs from the usual 4-sets-plus-a-pair formula: you need 7 PAIRS of tiles, all different from each other.

Key Chiitoitsu Rules

• All seven pairs must be distinct -- you can't split 4 identical tiles into 2 pairs (that counts as one pair plus two leftover tiles, not two valid pairs).
• Chiitoitsu only works with a closed hand -- no Pon/Chi at all.
• Its fu is always fixed at 25, regardless of what the pairs are.
• It's worth 2 han.

When Chiitoitsu Is a Good Choice

Chiitoitsu suits a hand full of scattered tiles that are hard to arrange into normal sequences/triplets -- instead of discarding all of them, you can steer the hand toward the more flexible pairs pattern.

An example Chiitoitsu hand -- 7 pairs, each a different tile type.