| Mahjong Variant | Value |
|---|---|
| Chinese Classical | Never |
| New Style | Common |
| Japanese Classical | Uncommon |
| HK Old Style | Rare |
| Guangdong Style | Common |
| Taiwanese | Uncommon |
| Chinese Official MCR | 24 "Fan" |
| Guangdong MCR | 7 Points |
| Japanese Riichi | 2-Han |
| Let's Mahjong! | N/A |
| Zung Jung | 30 Points |
Seven Pairs（七對子）is a pattern composed of seven pairs. The hand is concealed and always goes out on a single wait.
An example of Seven Unique Pairs. The blue tile is waiting for a 4 Bamboo.
By Mahjong Variant
Many rulesets require the seven pairs to be unique. Kongs never count, but 4-of-a-kinds can count as two pairs.
HKNS & HKOS
Uncommonly used, but when it is, these rulesets almost always allow 4-of-a-kinds to be two pairs.
Guangdong Style
4-of-kinds almost never count as two pairs. Seven Pairs almost always scores 7 Points, even if it's the only 7-point winning condition in the ruleset. Also, a small minority of rulesets allow a concealed Double-Double to also score for Seven Pairs.
Taiwanese
The equivalent pattern in Taiwanese is 7 Pairs and a Pung.
Some rulesets use it, others don't. 4-of-a-kinds count as two pairs.
Chinese Official MCR
Allows 4-of-a-kinds to be two pairs. Does not combine with Concealed Hand or Single Wait. May combine with Fully Concealed if Self-Drawn.
Zung Jung
Allows 4-of-a-kinds to be two pairs. Like all "Irregular Hands" it does not stack with Concealed Hand.