MahjongRepository/mahjong

Should 26+ han kazoe yakuman considered as double yakuman?

0xrgb opened this issue · 7 comments

0xrgb commented

There are many different rules about kazoe yakuman. Link

  1. Kazoe yakuman does not exist. Hands over 13+ han without yakuman is considered as sanbaiman.
  2. Kazoe yakuman exists, but hands over 26+ han do not counted as double yakuman.
  3. Kazoe yakuman exists, and you can consider 26+ han as double yakuman, 39+ han as triple yakuman, etc.

I don't know which rule is used by tenhou.net, but according to Wikipedia,

In most rules, a hand with 13 han or above is considered kazoe-yakuman.

so we could guess that tenhou.net uses the second rule.
(If someone has tenhou.net reply link that contains 26+ han, please upload it)

In addition, this library is considering 26+ han hands as double yakuman, such as

4446667788m + 7m / (2222m closed kan) / riichi (ron)
Dora and uradora indicators are [1m, 1m, 1m, 1m]
riichi tanyao chiniisou sanankou toitoi dora16 (28 Han)

Nihisil commented

Good catch. I wasn't able to find kazoe with 26+ han in phoenix replays (max kazoe had 21 han).

I think I will add option to configure kazoe rules.

0xrgb commented

There are more rulesets that tenhou supports. (Lobby that starts with C can use custom ruleset)
I'll list rules that related to this library (scoring).

  • Open pinfu +2 fu or 0 fu (0 fu ruleset can do 1 han 20 fu ron)
  • Tsumo pinfu is possible or pinfu is only for ron
  • Kiriage mangan (4 Han 30 Fu, 3 Han 60 Fu become mangan)
  • Support of renhou (mangan, baiman, yakuman, or ? Han)
Nihisil commented

Hm, I think we need to find a good way to pass all these custom rules to the calculator.

Maybe we had to pass dictionary with settings, because add additional function attributes for each case is not a good idea (it would be really big function otherwise)

This will broke compatibility, but I guess it is ok since no one use this library at current moment :)

I will come up with solution in the next a couple of days.

Nihisil commented

Tsumo pinfu is possible or pinfu is only for ron

Do you have any links related to this rule? I wasn't able to find it

0xrgb commented

From http://arcturus.su/wiki/Pinfu

As an exception, pinfu with mentsumo gains 0 fu from tsumo, or winning by self-draw. Normally, a winning tile drawn from the wall is worth 2 fu. In turn, the hand qualifies as pinfu, and these 2 fu are waived. The hand is then scored at 20 fu; and at least 2 han for menzen tsumo and pinfu. Some rule variations may not allow waiving these fu, and score such a hand as 30 fu, tsumo, without pinfu. Such variations are rare.

So, pinfu means hand without (extra) fu. Usually, tsumo gives you +2 fu except for pinfu. No-tsumo pinfu rule disallows this exception.

Nihisil commented

Thank you. I will add these rules variations a little bit later (kazoe config already implemented) and after that new release will be published.

Nihisil commented

Thanks for these suggestions. They were implemented in the new release https://github.com/MahjongRepository/mahjong/releases/tag/v1.1.2

You can find out more about these settings here: https://github.com/MahjongRepository/mahjong/blob/v1.1.2/mahjong/hand_calculating/hand_config.py#L43

And there is an example how you can change the cost of renhou (or any other yaku): https://github.com/MahjongRepository/mahjong/blob/master/doc/examples.py#L92