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Kokushi musou: Difference between revisions
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Restricted as closed only, this hand must draw at least 12 of the 13 required tile types. If a pair exists within the hand upon [[tenpai]], then naturally, the hand is waiting on the last remaining tile type not yet in the hand. This hand will become [[karaten|impossible]] if all four of any of the tile types are no longer available. | Restricted as closed only, this hand must draw at least 12 of the 13 required tile types. If a pair exists within the hand upon [[tenpai]], then naturally, the hand is waiting on the last remaining tile type not yet in the hand. This hand will become [[karaten|impossible]] if all four of any of the tile types are no longer available. | ||
===Attempting kokushi=== | ===Attempting kokushi=== | ||
[[Image:Kokushi real.jpg|thumb|250px|right|Kokushi musou with real tiles.]] | [[Image:Kokushi real.jpg|thumb|250px|right|Kokushi musou with real tiles.]] | ||
In order to for this hand to be reasonable, your [[haipai|starting hand]] should contain many terminals/honors, generally 9 or more. This gives the option to call [[Tochuu_ryuukyoku#Kyuushu_kyuuhai|kyuushu kyuuhai]], if no tiles have been called by others, and if the ruleset allows this [[abortive draw]]. Declining (or not having) this option puts the hand on the path to form the yakuman. | |||
{| class="wikitable sortable" | {| class="wikitable sortable" | ||
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* At 9 or less unique yaochuhai, the chance of winning, let alone the chance of reaching tenpai, are quite low. You should invoke a draw via [[Tochuu_ryuukyoku#Kyuushu_kyuuhai|kyuushu kyuuhai]], if able, unless you really need a big hand. | * At 9 or less unique yaochuhai, the chance of winning, let alone the chance of reaching tenpai, are quite low. You should invoke a draw via [[Tochuu_ryuukyoku#Kyuushu_kyuuhai|kyuushu kyuuhai]], if able, unless you really need a big hand. | ||
* At 10 unique yaochuhai, it becomes more reasonable to go for the yakuman. Assuming you have a pair, the hand's [[ukeire]] is somewhat lower than a 2-shanten [[chiitoitsu]]. That is | * At 10 unique yaochuhai, it becomes more reasonable to go for the yakuman. Assuming you have a pair, the hand's [[ukeire]] is somewhat lower than a 2-shanten [[chiitoitsu]]. That is decent when you consider the value of a yakuman hand. If you need a quick hand, though (e.g. to improve placement when close to [[oorasu|all last]]), then a draw can be reasonable to invoke. | ||
* At 11 unique yaochuhai, the hand is at (or basically at) [[iishanten]], so you should usually go for kokushi. | * At 11 unique yaochuhai, the hand is at (or basically at) [[iishanten]], so you should usually go for kokushi. | ||
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Kokushi musou juusan menmachi is very rare. Out of all random tile draws that result in tenpai for kokushi, the chance of naturally drawing all 13 tiles without a single duplicate is approximately one in 9500 (~0.0106%). The only "consistent" way to achieve the double yakuman is to complete kokushi via tsumo, but discard the pair and hope to complete the hand while in furiten. | Kokushi musou juusan menmachi is very rare. Out of all random tile draws that result in tenpai for kokushi, the chance of naturally drawing all 13 tiles without a single duplicate is approximately one in 9500 (~0.0106%). The only "consistent" way to achieve the double yakuman is to complete kokushi via tsumo, but discard the pair and hope to complete the hand while in furiten. | ||
===Discard characteristics=== | ===Discard characteristics=== | ||