Chiitoitsu

Conditions

• The hand must consist of exactly seven pairs (14 tiles total, forming 7 pairs of 2 identical tiles each)
• All seven pairs must be different; four of the same tile does not count as two pairs for chiitoitsu
• The hand must be fully concealed (closed only); you cannot call pon, chi, or kan
• Always scored as 25 fu with a flat 2 han, regardless of tile composition
• Cannot combine with iipeiko or ryanpeikou since those require sequence interpretation

Strategy Tips

• When your starting hand has four or five pairs, chiitoitsu becomes a realistic target. Count your pairs at the start and decide early whether to pursue this path.
• Chiitoitsu tenpai is always a single tile wait (tanki), which can be hard to read for opponents. Use this to your advantage by waiting on a tile that appears safe or has few discards.
• This hand pairs naturally with tanyao (all simples pairs), honitsu (one suit plus honors), or honroutou (all terminals and honors) for significant bonus han.