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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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. m- v& _ }& N$ H, R5 P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。
7 Z5 Y0 w, g- |9 U! O
9 n5 s* |* ~4 A0 ~. V严格来计算德扑概率应该这样:9 Q: d( @* g9 B7 e
; ~8 p/ D- n' W- G/ `( |+ z
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;
1 a$ r p( ? R' h) N9 H. V; g# i0 e
你想要的牌是4张5和4张10,共4+4=8张。# S) f, b5 ~. D8 K3 A% E% P
T; [* \+ I) D: Q* }; C0 l) d
那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。
2 |- M' T* G% B8 q' \" B2 c& p/ H" b7 \4 \9 {- B1 S4 E) w
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,
' P% ]) u% K2 p9 _4 g& U
! j! ^( t* Q" e8 _, ]9 c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。/ I+ G5 a5 {" V
. a% x" q% v) i% g- B# w, T; V, D这是四二法则中的“二”。
1 S) B$ {9 n4 s* A0 M
3 @' j- D' x1 P; k0 Y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。. |2 I1 a$ H9 u& w8 ?
/ }+ W* O2 ?2 T# O比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。$ t- s: l3 h. m3 C% \
2 Z0 ~0 c' M8 C
不一样的是,你有两轮机会来等5或者10,共8张想要的牌; {* h5 l! `: x; r5 y0 q y! i- i
7 b( R! K* E3 V% v. D. F O那么两轮内你中顺子的概率为:& y" o1 @( m' E3 ^/ D8 u8 e
1 {4 w7 P; A: w1-(47-8)/47*(46-8)/46=0.3145,即约为31%。
1 Y c& r, P" M5 d3 x, k
, m' }% c; v+ E/ U- K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。' q8 A: f H7 A
/ x$ M7 b5 V. w/ P2 ~0 j
这就是四二法则中的“四”。, Q1 `- B. m7 r* S
, R: c. @; N2 F/ [( Q
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。
6 }$ |5 t j' l) ~" e6 I5 C& p- ~& P4 {9 P5 t" u2 l
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