Proto-mahjong › Chinese classical › Shanghai / Hong Kong new style › Hong Kong old style › Guangdong style › Guangdong MCR / GMCR
Guangdong MCR / GMCR
2020s
Sources
The documents this entry rests on, as published. Each can be opened and checked; nothing in this part is anybody’s reading of them.
Mahjong Wiki. "Guangdong MCR Overview." mahjong.wikidot.com. canonical checked 2026-09-19
http://mahjong.wikidot.com/rules:gmcr-overview
chart’s note Cited as the source for individual nodes in the chart's node table. Carries no bibliography or per-claim citations of its own; see the appendix on tracing the wiki.
Also cited on: Shanghai / Hong Kong new style, MCR / Chinese official · bibliography #43
Mahjong Wiki. "Guangdong Style Overview." mahjong.wikidot.com. cross-check checked 2026-09-18
http://mahjong.wikidot.com/rules:guangdong-style-overview
chart’s note Cited as the source for individual nodes in the chart's node table. Carries no bibliography or per-claim citations of its own; see the appendix on tracing the wiki.
Also cited on: Hong Kong old style, Guangdong style · bibliography #42
World Mahjong Tour. Guangdong Mahjong tournament rules. cross-check checked 2026-09-19
https://worldmahjongtour.live/tournament-rules-guangdong-mahjong/
AI summary A tournament codification of Guangdong style, showing the variant in current competitive use.
Only cited here · bibliography #74
Mahjong Wiki. "Hong Kong Old Style Overview." supporting
http://mahjong.wikidot.com/rules:hong-kong-old-style-overview
chart’s note The 1950s simplification, removal of fu, the 1970s 3-3 system, and the late-1980s split into Taiwanese and Guangdong styles.
Also cited on: Hong Kong old style, Modern HKOS, Guangdong style, Taiwanese style · bibliography #8
Analysis
Written by an AI model from the sources above. It is a reading of them, not a source in its own right: every figure in it points back to a numbered source, and where the two disagree, the source is right.
Assessment
- Confidence
- documented a published ruleset or rule description exists and is cited
- Evidence
- corroborated two or more independent sources agree on the facts that define this variant
Cross-comparison
What each source was read to say, set side by side. The numbers are the sources above.
| Source | Tiles | Hand | Flowers | Scoring | Payout |
|---|---|---|---|---|---|
| [1] | — | — | — | built only from rules found in historic Guangdong Style rulesets, and teachable as a three-step progression through Clear Chapter and New Chapter HKOS | — |
- [2] the same timeline ends: 2020s, the synthetic competitive variant Guangdong Mahjong Competition Rules (GMCR) is made. This corroborates the chart's 2020s date
- [1] states GMCR was created to promote competitive Guangdong Style, with three goals: true to the game yet simple, easy to learn, and competitive — the last achieved by removing pure-luck wins such as Blessing of Heaven and the self-drawn win. Gives an explicit descent chain: GMCR evolved from Guangdong Style, which evolved from HKOS, which was adopted as a backlash to HKNS, which evolved from Chinese Classical
- [3] a tournament codification of Guangdong style, showing the parent variant in current competitive use
Reading it
The 2020s date is confirmed by two wiki pages, and the entry now has real content: GMCR was assembled to make Guangdong Style competitive, drawing only on rules already present in historic Guangdong rulesets and stripping out pure-luck wins like Blessing of Heaven and the self-drawn win. Its own page also states the descent chain in words — GMCR from Guangdong Style, Guangdong from HKOS, HKOS adopted as a backlash to Hong Kong New Style, and that from Chinese Classical — which matches the chart's shape through this whole branch, including the intermediate new-style node.
In the tree
Descends from Guangdong style, as the source chart draws it.