Sankantsu
Sankantsu 「三槓子」 is a standard yaku. This yaku requires kan to be called three times by one player. Due to this requirement, this yaku is actually the most difficult of the regular yaku. Within Tenhou.net, the yaku actually occurs less frequently than some yakuman.
| Type | Yaku |
|---|---|
| Kanji | 三槓子 |
| English | Three kans |
| Value | 2 han |
| Speed | Very slow |
| Difficulty | Very hard |
Tile pattern
Waiting for:
Per the yaku's name, kan must be called three times; and as a result, the tenpai hand has at most four tiles remaining as closed. If necessary, the hand can call as far as a single tile remaining.
Development
Of all the standard yaku, sankantsu is the most difficult and least frequent. Its rate of occurrence is comparable to that of some yakuman. As the name implies, kan must be called three times before the end of the hand. A fourth kan converts the hand to the yakuman, suukantsu. The difficulty stems from the need to call kan three times; but overall, the use of kan is risky play due to additional kan-dora, which may benefit the other players. This is true even for a single kan call, let alone three times.
Compatability
^ Ippatsu requires riichi to be of any use.
| RCH | DRI | IPP^ | SMO | TAN | PFU | IPK | ITT | YAK | SDJ | SDO | TOI | SNA | SNK | CHA | JUN | RPK | SSG | HRO | HON | CHN | CHI | RIN | HAI | HOU | CHK | |
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No sequential based yaku can combine with sankansu. This rules out pinfu, iipeikou, ittsu, and sanshoku doujun. Chiitoitsu is incompatible due to its usage of pairs.
Pitfalls
Sankantsu's difficulty stems from its various pitfalls during hand development. For starters, attaining the tiles necessary to call kan three times is difficult onto itself. In order to call kan in the first place, a player has to draw three out of the four tiles.
Value
This yaku is set at 2 han. However, the number of kans significantly increases the hand's value. Even with the minimum 3 kan of simples, they generate a fu count of 8 fu each, for a total of 24 additional fu to the base 20. So, at a minimum, this yaku is valued at 2 han and 50 fu, which is the equivalent of 3 han and 25 fu.
External links
- Sankantsu in Japanese Wikipedia