Chinese Official Mahjong · 2 pt
Concealed Kong in Chinese Official Mahjong (MCR): Points, Concealed Hand and Examples
In Chinese Official Mahjong, Concealed Kong (暗杠) is worth 2 points: you win with one kong whose four tiles you all drew yourself and declared on your own turn, with no discard involved.
On this page
The rules for Concealed Kong
- All four tiles are self-drawn, and you declare the kong after your draw
- A kong using a discard (claimed or promoted) is a Melded Kong (1)
- A concealed kong is not a claim: the hand is still Concealed (2) or Fully Concealed (4) if you self-draw
- It also counts as a concealed pung toward Two or Three Concealed Pungs
What Concealed Kong does not combine with
- Two concealed kongs: Two Concealed Kongs (6) instead
- Three or four kongs: Three Kongs (32) or Four Kongs (88) instead
- One concealed plus one melded kong: scored separately, 3 points
The tiles still score: a dragon kong is a Dragon Pung, a terminal kong a Pung of Terminals or Honors. Four identical tiles you did not declare are Tile Hog; once declared as a kong, Tile Hog no longer applies.
Scoring examples
Won on a discard
| Concealed Hand | 2 |
| Concealed Kong | 2 |
| All Simples | 2 |
| Total | 6 pt |
|---|
Below 8 points — not allowed to win.
Not counted (implied by a bigger fan): No Honors
Self-drawn · Replacement tile after a kong
| Out with Replacement Tile | 8 |
| Fully Concealed Hand | 4 |
| Concealed Kong | 2 |
| All Simples | 2 |
| Total | 16 pt |
|---|
Reaches the 8-point minimum — a legal win.
Not counted (implied by a bigger fan): No Honors、Self-Drawn
Why it helps you reach 8
Two points plus "the hand stays concealed" is a useful combination when you are a few points short:
- Concealed Hand (2) + Concealed Kong (2) is already 4; one Dragon Pung, wind pung or Two Concealed Pungs more and you are there.
- The kong gives an extra draw, and possibly Out with Replacement Tile (8).
- When not to kong: when one of the four tiles is part of a chow shape (3333 + 45 loses the 345 option), or when you are already waiting and the kong would change your wait.
Related fan
- Melded Kong: a kong using another player's tile, 1 point.
- Two Concealed Kongs: two concealed kongs, 6 points.
- Two Concealed Pungs and Three Concealed Pungs: a concealed kong counts as a concealed pung.
- Tile Hog: four identical tiles that were not declared as a kong.
- Out with Replacement Tile: self-drawing the replacement tile.
How often it happens
In 4,000 hands of the site's AI playing normally, wins with a concealed kong were 1.1%, averaging 15.8 points.
FAQ
How many points is a Concealed Kong?
2 points in Chinese Official Mahjong, one more than a Melded Kong. Two of them score Two Concealed Kongs (6) instead.
Is my hand still concealed after a concealed kong?
Yes. No discard was used, so Concealed Hand still counts, and a self-drawn win is Fully Concealed Hand.
Does a concealed kong count as a concealed pung?
Yes. In MCR it counts as one concealed pung toward Two or Three Concealed Pungs. To see it scored in play, play MCR online.
Related fan
Melded Kong 1 pt
A kong made with another player's tile for 1 point: claimed or promoted; two or more turn into Two Melded Kongs or Three Kongs.
Two Concealed Kongs 6 pt
Two self-drawn kongs for 6 points: replaces Concealed Kong and Two Concealed Pungs, and it is one pung away from Three Concealed Pungs.
Two Concealed Pungs 2 pt
Two self-drawn pungs for 2 points: concealed kongs count, a pung completed on a discard does not — and self-drawing the same hand can make it Three Concealed Pungs.
Try it at the table
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