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Riichi strategy: Difference between revisions
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However, there are a few cases where score does not matter: | However, there are a few cases where score does not matter: | ||
* Past [[mangan]], each han has reduced effectiveness. A [[haneman]]-or-higher hand shouldn't riichi because it is already very valuable, so the score bonus from riichi isn't as impactful. (For example: Going from 6 han -> 7 han doesn't increase score. 7 han -> 8 han is only a +25% boost to score.) | * Past [[mangan]], each han has reduced effectiveness. A [[haneman]]-or-higher hand shouldn't riichi because it is already very valuable, so the score bonus from riichi isn't as impactful. (For example: Going from 6 han -> 7 han doesn't increase score. 7 han -> 8 han is only a +25% boost to score.) | ||
* When first with a large lead, or first during [[all last]]. In this case, damaten helps increase your win rate, allowing you to end the game faster. | * When first with a large lead in South round, or first during [[all last]]. In this case, damaten helps increase your win rate, allowing you to end the game faster. | ||
* When in [[all last]], where both dama and riichi will result in the same final placement | * When in [[all last]], where both dama and riichi will result in the same final placement, even with a direct hit riichi + 1 ura dora. | ||
That being said, the extra points from riichi often do matter. Mahjong is a game about scoring the most points, after all. | That being said, the extra points from riichi often do matter. Mahjong is a game about scoring the most points, after all. | ||
=== Winning chance === | === Winning chance === | ||
Pressing players to defend will often lower your chance of winning. | Pressing players to defend will often lower your chance of winning. Assuming the hand has a yaku other than riichi, a riichi declaration (on average) lowers winrate by x70% to x80%.<ref>Miinin. ''Statistical Mahjong Strategy''.</ref> | ||
Since riichi more-than-doubles your score before mangan, it is more than worth it to riichi in most cases. However, if the point boost doesn't matter, then dama is better for the increased win rate. | |||
Hands which have an extremely poor wait (e.g single tile wait on dora) are so bad that riichi doesn't reduce their chance of winning by much. | Hands which have an extremely poor wait (e.g single tile wait on dora) are so bad that riichi doesn't reduce their chance of winning by much. | ||