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“四二法则”是一种估算概率的方法,让你能快速计算你想要的牌出现的概率。
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7 }7 ]! N6 u6 h4 \比如:桌子上的牌是A-6-7-Q,而你的手牌是8-9。你想要再来一张5或者10来凑成顺子,但你只剩最后一轮机会。
6 `& t& H4 E$ Q# B( i* Q: u3 B* ], ~( n/ E+ v& |
严格来计算德扑概率应该这样:6 v7 {3 X9 Z( G, m6 z/ Q4 R/ W
, n' y' A! ]& G4 P一副牌52张,去掉翻牌3张,转牌1张,手牌2张,剩下52-3-2-1=46张;5 M# ^+ c0 i3 U7 g) @
( B5 M' H1 y8 `7 C9 j你想要的牌是4张5和4张10,共4+4=8张。
" w+ w/ o7 V. d5 ]' o8 j; b$ C0 U9 F1 H, e, j1 U) c
那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。
: Z7 v3 Y0 `, u* I. T* _' ] Q7 e1 E9 ^4 ~: O5 X [9 N
你可能觉得这样计算会比较麻烦,于是就有了四二法则,即:你想要的牌有4+4=8张,$ `! _, {& v4 K
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只剩最后一轮机会,所以让8*2=16,即你有约16%的机会中顺子,与上述17%基本近似。
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; D9 o; H$ ^& I& P& w( \* J这是四二法则中的“二”。
. Y4 A( ` B8 j! B- i0 U# P/ {! X2 v' S: A8 Y3 L7 I2 S* h
当然,如果你还有两轮机会的话,即河牌圈与转牌圈,情况是这样的。
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& N, J4 w7 | s. `比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。
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, z/ B6 q6 H2 l8 \4 }6 Z- ?+ o- H不一样的是,你有两轮机会来等5或者10,共8张想要的牌" i' b- }! s' e; z/ @# s
" t7 t$ p0 `6 b K
那么两轮内你中顺子的概率为:1 s( L9 N. M/ P
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1-(47-8)/47*(46-8)/46=0.3145,即约为31%。
5 x* D! l* k( ?$ c$ H; R+ l9 M' ~) |# i
那么利用四二法则,8*4=32,即你约有32%的机会中顺子,是不是跟理论值也很接近。
9 @- q8 ]8 Y0 u O. v4 V w. p5 \/ Z9 U2 F7 L
这就是四二法则中的“四”。9 ^7 f5 ?- N* Q
3 \2 [% ^# L1 w( f" Q3 A2 h总之就是,先想好自己想要的牌的张数,然后,还有两轮机会就乘4,还有一轮机会就乘2,得到的就是你想要的牌接下来会出现的概率。接着,根据真人德扑圈的游戏玩家以及战况来决定接下来该怎么办。利用好四二法则,可以帮你快速估算概率。. F8 v1 m4 H S9 P2 {. P3 H2 ]( U- _
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