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Chiitoitsu: Difference between revisions
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Tenpai for chiitoitsu always uses the wait of [[tanki]] (pair wait) in order to complete the seventh and last pair for the hand. | Tenpai for chiitoitsu always uses the wait of [[tanki]] (pair wait) in order to complete the seventh and last pair for the hand. | ||
Note that the pairs must be distinct; having four of the same tile does not count as two pairs under standard rulesets. Even in rules that do allow four-of-a-kind to count as two pairs, a call for "[[kan]]" would not count, as a kan is treated as a triplet. | |||
===Hand interpretation=== | ===Hand interpretation=== | ||
Unlike most mahjong hands, chiitoitsu is an exception to the "four [[Mentsu|groups]] and a pair" pattern. Instead, tiles are groups into pairs or toitsu. | Unlike most mahjong hands, chiitoitsu is an exception to the "four [[Mentsu|groups]] and a pair" pattern. Instead, tiles are groups into pairs or toitsu. As such, the tile groupings cannot be interpreted other ways. For this reason, chiitoitsu is granted a unique fu count of 25 (which is not rounded). | ||
===Shanten=== | ===Shanten=== | ||
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| 5 || 1 || {{#mjt:16m2457p6899s136z}} | | 5 || 1 || {{#mjt:16m2457p6899s136z}} | ||
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===Vs Toitoi=== | |||
Given the number of pairs in the hand, it may be tempting to pon in order to aim for [[toitoi]]. But, if you don't already have a triplet, chiitoisu is generally faster to complete. This is especially true if the hand is [[iishanten]] for chiitoitsu. | |||
The decision for chiitoitsu/toitoi will depend on the [[situational analysis|point standing]]s, the current round, the number of tiles available, and what the rest of the hand looks like. The following is a rough guideline on which to go for: | |||
Chiitoitsu: | |||
* Prefer chiitoitsu if a pair cannot be turned into a triplet (if both other copies of the tile are visible). | |||
* Prefer chiitoitsu at 1-shanten (5 pairs). | |||
** With 4 pairs + 1 other triplet, keep your options open, unless a pair cannot be turned into a triplet. The hand is currently 1-shanten for chiitoitsu, and can turn into a wider toitoi 1-shanten after a pon. | |||
Toitoi: | |||
* If you have 4 pairs and a tile group forms, tend to prefer the regular hand structure; this may or may not be toitoi. | |||
** Exception: if the rest of the hand is isolated tiles or otherwise poor quality (e.g., 1244m2288p11s55s8s draw 2p), then prefer chiitoitsu. | |||
* Prefer toitoi when all of the pairs can be turned into triplets, and most/all of the pairs are easy to pon (honors/terminals). | |||
* Prefer toitoi when the hand has another yaku, e.g., [[yakuhai]] or [[tanyao]]. This gives the option to go for a fast hand if a sequence forms, while still giving the chance for toitoi. | |||
== Compatibility == | == Compatibility == | ||