Chinese Official Mahjong
MCR tournament rules with 81 fan and an 8-point minimum
Chinese Official Mahjong (MCR) under the 1998 competition rules, with 81 fan, an 8-point minimum and the non-repeat principle, scored for you.
Features
Competition rules
The 1998 Mahjong Competition Rules with 144 tiles, 13-tile hands and no dealer bonus.
81 fan, fully itemised
Results list every fan scored and every smaller fan excluded under the non-repeat principle.
Waits under 8 flagged
The wait hint shows each winning tile's score and marks waits that cannot reach 8 points.
Online tables
Quick match plays one round of four hands; private rooms set the length and minimum.
How it works
- 1
Draw and lay out flowers
Keep 13 tiles; flowers are set aside and replaced, but they do not count toward the minimum.
- 2
Plan toward 8 points
Combine fan from the 81 on the list so the finished hand is worth at least 8.
- 3
Win and settle
The discarder pays fan plus 8 and the others 8 each; on a self-draw all three pay fan plus 8.
About the game
Chinese Official Mahjong, known as Guobiao or MCR, is the rule set adopted for competition in 1998 and used at tournaments around the world. It uses 144 tiles with flowers and 13-tile hands, with chows from the player on your left and pungs or kongs from anyone.
Two rules give it its character. First, a hand must be worth at least 8 points to win, and flowers do not count toward that total. Second, points come from a list of 81 fan governed by the non-repeat principle: a smaller fan implied by a larger one is not added again. Players therefore plan a hand toward specific combinations rather than simply completing sets. There is no dealer bonus and no dealer repeat; the deal moves on after every hand, the prevalent wind changes every four hands, and an exhausted wall is a draw with no payments. Besides the usual four sets and a pair, MCR recognises unusual shapes such as knitted straights.
What Seriauth built
The scoring engine evaluates all 81 fan, applies the exclusions and shows a full itemised result. The wait hint lists the score of every winning tile and flags waits under 8 points. Computer opponents plan toward 8 points like real players, at three levels. Games can last one hand, one round or the full 16-hand session, and four-player online rooms let the host choose the length and the minimum. An illustrated guide and pages for popular fan explain the system.
FAQ
Why do I need 8 points to win?
The 8-point minimum is the core rule of MCR. Flowers do not count toward it, so a hand must be planned from the start.
What is the non-repeat principle?
Smaller fan that are already implied by a bigger one are not counted again, so each pattern is scored once.
Are there special hands?
Yes. Besides four sets and a pair there are Seven Pairs, Thirteen Orphans, Honors and Knitted Tiles, and Knitted Straight hands.
How long is a full game?
Four rounds of four hands, 16 in all, the length of a tournament session. Single hands and one-round games are also available.
More from this series
View all work
Let's turn a good idea into something real
Partnerships, product questions or suggestions — we'd love to hear from you.