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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。+ c* q* S( N. u/ f5 w
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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。% d1 x$ R8 S$ \% }
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严格来计算德扑概率应该这样:9 T1 j7 |2 X; _. v! T7 t
% x3 U* J6 x$ V
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;7 N( v0 a( B4 e3 J
; ^. D+ b. y# ]5 [你想要的牌是4张5和4张10,共4+4=8张。' N8 V& x# n" j! d7 w! G
) \3 C5 H' j# p那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。
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9 f$ W1 Q: E" d0 G4 f. e1 u o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,3 ?$ T+ v; r9 o0 n3 T3 `, j
2 ^% `" Z/ ^+ _ u% y5 m, B
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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这是四二法则中的“二”。
6 I8 W' h1 R6 b3 P n5 k6 J$ s( d" e" l% i9 H* r
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。% T+ u- l: s9 {
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比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。
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& T& e, i' M! \* }% 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
, i5 D6 U, \) {8 q- j8 i& x
4 ?2 ?! k/ U( V# j7 G5 @( r: w那么两轮内你中顺子的概率为:
3 w# {, g/ g" u% ~- s6 {: @% z
8 E. G; w# G# I% L8 j; }1-(47-8)/47*(46-8)/46=0.3145,即约为31%。" v1 B; N6 y% L, O
9 K T; R7 M! F. c3 b
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。- d3 @3 K) H: v' s. i
9 L" v7 \+ M3 e% W/ n: Z& V
这就是四二法则中的“四”。( ^) m) I1 i" V
4 y- q& O4 U4 l" v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。' t: ], {) B7 H! K* x T
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