Jantou
By Kenji Tanaka · Updated
Definition
Jantou is the pair every standard hand needs beside its four melds, also called the atama or head. A value-tile pair adds 2 fu and can grow into a yakuhai triplet; pinfu demands the opposite, a pair worth nothing at all. Late in a hand your pair choice often becomes your wait: two pairs set up a shanpon, a lone leftover tile becomes a tanki.
Jantou
Jantou at a glance
Jantou (雀頭, じゃんとう) is the pair in your hand, two identical tiles that form the “head” or “eyes” of a winning mahjong hand. Every winning hand in standard mahjong requires exactly one jantou and four melds (either sequences or triplets).
Understanding Jantou
The jantou is one of the fundamental structural requirements in mahjong. While melds receive significant attention in strategy discussions, the jantou is equally essential: without it, you cannot win, regardless of how well-formed your melds are.
Role in Hand Structure
A complete winning hand consists of:
- One jantou (pair): 2 tiles
- Four melds: 12 tiles (3 tiles per meld)
- Total: 14 tiles
This 1-4 structure is universal across standard mahjong variants. The jantou can be composed of any pair of identical tiles, honor tiles (winds or dragons) or number tiles of the same suit and rank.
Strategic Importance
The jantou’s placement in your hand affects your winning possibilities. Early in the game, you might hold multiple potential pairs while developing your melds. As you draw and discard, you typically commit to one pair while discarding the others. This decision point is crucial because:
- Flexibility: Holding multiple potential pairs early keeps your options open
- Commitment: Choosing your jantou early reduces flexibility but clarifies your hand direction
- Waiting patterns: Your jantou choice influences which tiles complete your hand (your winning wait)
Pair Stability
Some pairs are more valuable than others strategically. Honor tile pairs (especially dragons and your own wind) are often safer to keep because they’re less likely to be needed for melds. Number tile pairs can be converted into melds if circumstances change, offering greater flexibility during hand development.
Seeing Jantou in play
Consider this hand:
2m 2m 3m 4m 5m 6m 7m 8m 9m 1p 1p 5s 5sYou have three potential pairs: 2m, 1p, and 5s. You need to develop four melds while keeping exactly one pair. You might choose 1p as your jantou because:
- It’s a terminal tile (stable and hard for opponents to use)
- The 2m and 5s can be incorporated into melds
- This commitment allows you to focus on completing your sequences
If you draw a 5s, your hand becomes:
2m 2m 3m 4m 5m 6m 7m 8m 9m 1p 1p 5s 5s 5sNow the 5s form a complete triplet. With 1p-1p locked in as your jantou and the manzu runs 3-4-5 and 6-7-8 set, the 2m pair becomes your fourth-meld candidate and the lone 9m is the natural discard.