四海麻将基础版 | Four Seas Mahjong Basic Level
完整的基础规则版本，在入门版基础上加入经典造牌主线番种。
A complete Basic ruleset with classic hand-building main lines.
基础版
四海基础版
四海基础版是一套简单易上手、同时规则体系完整、可以让休闲玩家娱乐比赛的完整规则。在入门版基础上，基础版引入了五个经典造牌主线番种。
番种分类分值表
四海基础版共包含 18 个番种，其中 14 个牌型番，4 个偶然番。番种示例见附录。
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大类 - 类别 - 5 分 - 10 分 - 20 分 - 30 分 - 40 分 - 60 分
花色 - 混一色 - 清一色
牌型 - 平和 - 对对和 - 七对
序数 - 断幺 - 混带幺
刻杠 - 一杠
字牌 - 番牌
一色 - 同顺 - 一般高
连顺 - 连六 - 一条龙
三色 - 喜相逢 - 三色同顺
偶然 - 巡数 - 海底捞月
巡数 - 河底摸鱼
开杠 - 金鸡夺食
开杠 - 岭上开花
番种定义
分数 - 番种 - 定义
5 - 平和 - 由 4 副顺子及将牌组成的和牌
断幺 - 和牌中没有幺九及字牌
连六 - 一种花色 6 张相连的序数牌组成 2 副顺子
喜相逢 - 2 种花色 2 副序数相同的顺子
10 - 一杠 - 1 个杠
番牌 - 门风刻或三元牌的刻
一般高 - 一种花色 2 副序数相同的顺子
20 - 海底捞月 - 自摸牌墙上最后一张牌和牌
河底摸鱼 - 和打出的最后一张牌
金鸡夺食 - 即抢杠和，和别人自抓开明杠的牌
岭上开花 - 开杠抓进的牌成和牌
30 - 混一色 - 由一种花色序数牌及字牌组成的和牌
对对和 - 由 4 副刻子及将牌组成的和牌
混带幺 - 每副面子或对子都带有幺九或字牌
三色同顺 - 3 种花色 3 副序数相同的顺子
40 - 一条龙 - 一种花色的 123、456、789 三副顺子
60 - 清一色 - 由一种花色序数牌组成的和牌
七对 - 由 7 个对子组成的和牌
计分和授受法
每局和牌计分法与入门版相同，各番种按照“高分法”和“同类别不复用”原则累加计分。高分法指的是，当一副和牌有多种拆分方法，按照分数最高的拆分方法计分。同类别不复用指的是，组成和牌型的每一个顺子、刻子和对子，在同类别的番种系列中只能被使用一次，在不同类别的番种系列可以多次使用。
四海基础版得分授受采用四海授受制，即有分付线的出铳幺二制。点和时小牌分付，大牌包付，基础版分付线为 25 分。
自摸和时
三家分付，各家支付和牌分 H 的 2 倍（2H）。
点和时
当和牌分小于等于分付线 F = 25 时，点和方支付和牌分的 2 倍（2H），其他两家支付和牌分的 1 倍（H）。
当和牌分大于分付线 F = 25 时，非点和方支付分付线 F 的分数（25）；点和方支付和牌分的 2 倍（2H），并且包付另外两家和牌分与分付线的分差（H-F），总共支付 4H-50。
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和牌方式 - 条件 - 铳方 - 非铳方
自摸 - -2H - -2H
点和 - H <= 25 - -2H - -H
点和 - H > 25 - -(4H-50) - -25
起和标准
基础版的标准起和分为 10 分，无论自摸还是点和和牌。初学者可以设为 5 分。
番种示例
花色类
混一色（30 分，基础）
由一种花色序数牌及字牌组成的和牌。
🀚🀛🀜 🀜🀝🀞 🀡🀡🀡 🀅🀅🀅 🀁🀁
清一色（60 分，基础）
由一种花色序数牌组成的和牌。
🀐🀑🀒 🀑🀒🀓 🀕🀕🀕 🀖🀗🀘 🀓🀓
牌型类
平和（5 分，入门）
由 4 副顺子及将牌组成的和牌。
🀙🀚🀛 🀉🀊🀋 🀑🀒🀓 🀔🀕🀖 🀫🀫
对对和（30 分，基础）
由 4 副刻子及将牌组成的和牌。
🀉🀉🀉 🀞🀞🀞 🀓🀓🀓 🀂🀂🀂 🀫🀫
七对（60 分，基础）
由 7 个对子组成的和牌。
🀉🀉 🀎🀎 🀝🀝 🀞🀞 🀔🀔 🀘🀘 🀃🀃
序数类
断幺（5 分，入门）
和牌中没有幺九及字牌。
🀛🀜🀝 🀈🀈🀈 🀕🀖🀗 🀋🀋🀋 🀓🀓
混带幺（30 分，基础）
每副面子或对子都带有幺九或字牌。
🀇🀈🀉 🀡🀡🀡 🀐🀑🀒 🀁🀁🀁 🀏🀏
一色连顺类
一条龙（40 分，基础）
一种花色的 123、456、789 三副顺子。
🀇🀈🀉 🀊🀋🀌 🀍🀎🀏 🀫🀫🀫 🀫🀫
三色类
三色同顺（30 分，基础）
3 种花色 3 副序数相同的顺子。
🀌🀍🀎 🀞🀟🀠 🀕🀖🀗 🀫🀫🀫 🀫🀫
偶然类
海底捞月（20 分，基础）
自摸牌墙上最后一张牌和牌。
河底摸鱼（20 分，基础）
和打出的最后一张牌。
金鸡夺食（20 分，基础）
即抢杠和，和别人自抓开明杠的牌。
岭上开花（20 分，基础）
开杠抓进的牌成和牌。
Basic Level
Basic Level
The Basic level is a complete ruleset that is simple and accessible while still having a full rule structure suitable for casual play and friendly competition. Building on the Beginner level, it introduces five classic main lines of hand-building yaku.
Yaku Classification and Point Table
The Basic level contains 18 yaku: 14 hand-pattern yaku and 4 incidental yaku.
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Type - Category - 5 Points - 10 Points - 20 Points - 30 Points - 40 Points - 60 Points
Suit - Mixed One-Suit - Pure One-Suit
Form - All Sequences - All Triplets - Seven Pairs
Number - All Simples - Mixed Outside Hand
Quads - One Quad
Honors - Value Honor
One Suit - Identical Sequences - Two Identical Sequences
Consecutive Sequences - Half Straight - Pure Straight
Three Suits - Two Similar Sequences - Three Similar Sequences
Incidental - Last Tile - Last Tile Draw
Last Tile - Last Tile Claim
Kong - Robbing a Kong
Kong - Win by Kong Replacement
Yaku Definitions
Points - Yaku - Definition
5 - All Sequences - A winning hand composed of four sequences and a pair
All Simples - A winning hand containing no terminals or honor tiles
Half Straight - Two sequences in one suit made from six consecutive numbers
Two Similar Sequences - Two sequences with the same numbers in two different suits
10 - One Quad - One quad
Value Honor - A triplet of the seat wind or any dragon tile
Two Identical Sequences - Two identical sequences in one suit
20 - Last Tile Draw - Winning by self-draw on the last tile of the wall
Last Tile Claim - Winning on the last discarded tile
Robbing a Kong - Winning on a tile another player uses to declare an added open kong
Win by Kong Replacement - Winning on the supplement tile drawn after declaring a kong
30 - Mixed One-Suit - A winning hand composed of tiles from one suit and honor tiles
All Triplets - A winning hand composed of four triplets and a pair
Mixed Outside Hand - Every set or pair contains terminals or honor tiles
Three Similar Sequences - Three sequences with the same numbers in three different suits
40 - Pure Straight - The 123, 456, and 789 sequences in one suit
60 - Pure One-Suit - A winning hand composed entirely of tiles from one suit
Seven Pairs - A winning hand composed of seven pairs
Scoring and Payment
Scoring is the same as in the Beginner level: all yaku in the winning hand are added together according to the high-score method and the no-reuse-within-category principle.
The Basic level uses the Four Seas payment method, which is a 1-2 discard payment method with a payment line. On a discard win, small hands are paid by all opponents, while large hands are covered primarily by the discarder. In the Basic level, the payment line is 25 points.
On a self-draw win
All three opponents pay twice the hand score H, or 2H.
On a discard win
If the hand score is less than or equal to the payment line F = 25, the discarder pays 2H, and the other two players each pay H.
If the hand score is greater than F = 25, the non-discarding players each pay the payment line F, or 25. The discarder pays 2H and also covers the difference between the hand score and the payment line for the other two players, for a total payment of 4H - 50.
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Win Type - Condition - Discarder - Non-discarding Opponents
Self-draw - -2H - -2H
Discard win - H <= 25 - -2H - -H
Discard win - H > 25 - -(4H - 50) - -25
Minimum Score to Win
The standard minimum score for the is 10 points, whether the win is by self-draw or discard. Beginners may use 5 points instead.
Yaku Examples
Suit Yaku
Mixed One-Suit (30 points, Basic)
A winning hand composed of tiles from one suit and honor tiles.
🀚🀛🀜 🀜🀝🀞 🀡🀡🀡 🀅🀅🀅 🀁🀁
Pure One-Suit (60 points, Basic)
A winning hand composed entirely of tiles from one suit.
🀐🀑🀒 🀑🀒🀓 🀕🀕🀕 🀖🀗🀘 🀓🀓
Form Yaku
All Sequences (5 points, Beginner Level)
A winning hand composed of four sequences and a pair.
🀙🀚🀛 🀉🀊🀋 🀑🀒🀓 🀔🀕🀖 🀫🀫
All Triplets (30 points, Basic)
A winning hand composed of four triplets and a pair.
🀉🀉🀉 🀞🀞🀞 🀓🀓🀓 🀂🀂🀂 🀫🀫
Seven Pairs (60 points, Basic)
A winning hand composed of seven pairs.
🀉🀉 🀎🀎 🀝🀝 🀞🀞 🀔🀔 🀘🀘 🀃🀃
Number Yaku
All Simples (5 points, Beginner Level)
A winning hand containing no terminals or honor tiles.
🀛🀜🀝 🀈🀈🀈 🀕🀖🀗 🀋🀋🀋 🀓🀓
Mixed Outside Hand (30 points, Basic)
Every set or pair contains terminals or honor tiles.
🀇🀈🀉 🀡🀡🀡 🀐🀑🀒 🀁🀁🀁 🀏🀏
One-Suit Consecutive Sequence Yaku
Pure Straight (40 points, Basic)
The 123, 456, and 789 sequences in one suit.
🀇🀈🀉 🀊🀋🀌 🀍🀎🀏 🀫🀫🀫 🀫🀫
Three-Suit Yaku
Three Similar Sequences (30 points, Basic)
Three sequences with the same numbers in three different suits.
🀌🀍🀎 🀞🀟🀠 🀕🀖🀗 🀫🀫🀫 🀫🀫
Incidental Yaku
Last Tile Draw (20 points, Basic)
Winning by self-draw on the last tile of the wall.
Last Tile Claim (20 points, Basic)
Winning on the last discarded tile.
Robbing a Kong (20 points, Basic)
Winning on a tile another player uses to declare an added open kong.
Win by Kong Replacement (20 points, Basic)
Winning on the supplement tile drawn after declaring a kong.