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Kokushi musou: Difference between revisions
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[[Image:Kokushi real.jpg|thumb|250px|right|Kokushi musou with real tiles.]] | [[Image:Kokushi real.jpg|thumb|250px|right|Kokushi musou with real tiles.]] | ||
Kokushi is only realistic with many terminals/honors in your [[haipai|starting hand]]. Having 9 such tiles give 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. | |||
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Players must make the choice on whether to go for kokushi at the beginning of the round. This will depend on a couple of conditions, the most important being the number of unique yaochuhai at the start. The point standing and the current [[kyoku|round]] also matter. Sometimes, players need a yakuman in order to win or [[Gyakuten|improve placement]]. | |||
* At 9 or less unique yaochuhai, the chance of even reaching tenpai is quite low. Though the yakuman may be tempting, the expected value from attempting kokushi is lower than for a regular hand. Unless you really need a big hand, you should invoke a draw via [[Tochuu_ryuukyoku#Kyuushu_kyuuhai|kyuushu kyuuhai]] if able. | * At 9 or less unique yaochuhai, the chance of even reaching tenpai is quite low. Though the yakuman may be tempting, the expected value from attempting kokushi is lower than for a regular hand. Unless you really need a big hand, you should invoke a draw via [[Tochuu_ryuukyoku#Kyuushu_kyuuhai|kyuushu kyuuhai]] if able. | ||
* At 10 unique yaochuhai, it becomes more reasonable to go for the yakuman. Once you have a pair, the hand's [[tile acceptance]] is somewhat lower than a 2-shanten [[chiitoitsu]]. This is decent when considering the value of a yakuman. Overall, the expected | * At 10 unique yaochuhai, it becomes more reasonable to go for the yakuman. Once you have a pair, the hand's [[tile acceptance]] is somewhat lower than a 2-shanten [[chiitoitsu]]. This is decent when considering the value of a yakuman. Overall, the expected point gain from kokushi is greater than average, though win rate is low and 32000 points is often overkill. Therefore, if you need a quick hand (e.g., a tight point race when close to [[all last]]), invoking a draw is reasonable. | ||
* At 11 unique yaochuhai, the hand is close to or already at [[iishanten]], so you should usually go for kokushi. | * At 11 unique yaochuhai, the hand is close to or already at [[iishanten]], so you should usually go for kokushi. | ||
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=== 13-way wait development === | === 13-way wait development === | ||
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. | ||