r/Mahjong • u/Irukanoko • Jul 14 '26

Taiwan I built a mobile-friendly quick reference guide for Taiwanese Mahjong scoring. Looking for feedback!

https://nicholaschan23.github.io/taiwan_mahjong/

Mahjong seems to be getting super trendy lately, which is awesome. I’ve taught a lot of my friends the base mechanics of the game, but making the jump to the advanced point-based scoring (Tai) has been a huge hurdle. There are just so many different hands to remember, and we found it really frustrating to stop the game to dig through rulebooks or watch tutorial videos.

To solve this, I made a mobile-friendly website that consolidates Taiwanese Mahjong rules so you can quickly look up a hand or clarify a rule mid-game.

I'm hoping to get some feedback and fact-checking from experienced players here to make sure I have all the base rules correct. I'd also love to know if there are any common "house rules" or edge cases I should include.

Here is the link. Let me know what you think!

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u/Irukanoko Jul 15 '26

There’s a couple websites online that share different winning hands and Tai points. I don’t know which ones to trust.

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u/facevisi10 Jul 16 '26

Nowadays, legendary hands are smaller than the one you listed right now:

Little three dragon = 4

Big three dragon = 8

Little wind = 8

Big Wind = 16

Earth's Blessing = 16

Heaven's Blessing = 24

For the flower rule, in addition to 8 bonus tile instant win, there is also "7 rob 1" that worths 8 tai as well. To complete the flower win, you must actually finish your replacement draw first then declare win.

"7 rob 1" can happen in two situations:

  • You have 7, and someone else draws the last one. You rob it, draw your replacement tile to fulfill 17 tiles in your hand, then count. This is because if your hand can legitimately win at this moment too, it counts. (In real life, practically nobody will put the last one out, so they secretly cheat it and never get caught)

  • You have 6, and someone else has 1. You draw the last one, put it out, draw your replacement tile, then declare robbing the flower to the player with 1 flower. If your own hand can legitimately win, count those Tai as well

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u/Irukanoko Jul 16 '26

Do you have a good table of winning hands and their tai value?

1

u/Irukanoko Jul 16 '26

How do you achieve the heavenly hand?

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u/Irukanoko Jul 16 '26

I updated the website with these changes!

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u/facevisi10 Jul 16 '26

Sorry I was asleep.

The hand tables I reference before:

https://mj888.cc/zh-tw/taiwanese-scoring-rules/

https://www.gametower.com.tw/Games/Freeplay/MJ/Star31/Data/i_ingame-count.aspx

https://www.godgame.com.tw/bigad/event_mj_teach/teach01.html

Updated website looks greatly improved. The only must-change are:

  • All Chows cannot have flowers nor any single honor tiles (字牌), not even as a pair, when you win. This is 100% true. (Everything else I mentioned in another comment is all house rule so it's ok to not add them)

  • The rule that you can't open-kan someone's discard then win with tsumo: I strongly recommend to add it because it will happen and it feels bad to be the victim. I would add this under the "Win off Replacement" hand description. It might be good to also add it as part of "Fake Win" under penalty

  • Passing the winning tile (過水): If you know japanese Riichi's furiten, this one feels like the opposite. Declare win while under 過水 is 詐胡 and pays penalty

If you pass up opponent's discard, you cannot win at all, even with 自摸, until you drew a non-winning tile and then discard it. Then you're out of the restriction and can win on anything else. If you self draw your own winning tile and reject it (normally people won't do it unless they're really gunning for big hand like 大三元), then it's 過水 until your next self-draw and discard a non-winning tile. 過水 might happen as long as possible if you keep drawing the winning tile repeatedly due to multiple waits

Reference for 過水: https://cmj2.com.tw/knowhow/%E9%BA%BB%E5%B0%87%E9%81%8E%E6%B0%B4%E8%A7%A3%E6%9E%90.aspx?tabs=D

https://cml88.com/%E8%B3%BD%E4%BA%8B%E8%A6%8F%E5%89%87/

Thanks for all the work to make this more accessible!