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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。3 K8 S1 l& @$ E) J
2 Z6 |5 v: |/ k% D! J7 x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 W: v7 s* ^* y! B3 N
: }) c; V6 {$ n严格来计算德扑概率应该这样:0 s' b5 p, e0 N: U9 `
1 U. U/ n9 b5 j. g1 A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;
: l" t( R# u4 u- `* [4 O
! D0 x7 N/ T. E( ~你想要的牌是4张5和4张10,共4+4=8张。
4 J7 J' b0 w$ i6 x; p
! X" { \) x7 W那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。
9 }+ l# r; I/ C7 Q" u! s
% p' B! L9 s( P: N; v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,
6 L+ a' ^- C4 @) t: h% u* \, X1 X7 v. W: y. x
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。
0 p9 g6 U9 Z z6 s g5 o0 S& w; o" ]$ j" \
这是四二法则中的“二”。& A9 q3 w4 Q7 x
8 U# v: D/ I; F6 _3 G& s; p7 A3 d! _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。) T2 |0 V- h$ g9 X5 H+ X- u
' f( x5 y% U! \1 F1 w比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。
# y7 V" r( ]6 Y: w. H# ]3 `* h. j; e
不一样的是,你有两轮机会来等5或者10,共8张想要的牌
7 n/ K' n+ } T+ g/ X
* w/ U- Z1 r) ]. y' X那么两轮内你中顺子的概率为:5 B) a. s; u9 k& ]8 C) z0 B9 y) }/ j
; ~# K% K3 i+ ` Z5 m! ]! I
1-(47-8)/47*(46-8)/46=0.3145,即约为31%。; a- n8 E- Z9 K* V: { N- W8 z
" y+ ^% v3 y; g$ N
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。- r9 s- c& m+ C) s
4 k+ F$ _( M- O w- B
这就是四二法则中的“四”。) i( F g! T: d5 u* e
6 z% I' v9 B, b, }/ \
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。7 M9 F- X4 H0 D6 v) ^# i/ `
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