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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。7 U- R- B! W# `3 t
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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。# r. O/ ^2 u1 r: d& o' ~& U6 i0 {
( D6 N9 f) g3 {7 @ O( l. q% b严格来计算德扑概率应该这样:1 P% \! U/ K2 d. ~9 \
+ X0 P% Q4 R. v7 s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;
: i# T$ z% e3 j% m5 s
! @ G2 y- r2 w7 W% b你想要的牌是4张5和4张10,共4+4=8张。
) L. P6 E6 q% P8 t4 i" a: ?2 Q$ o+ }& y% k. j# @+ R5 s n
那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。
! t7 \6 F; K+ y8 I) E6 d7 F7 c1 m" M1 v0 Y
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,: W0 y; g9 m$ g; b |7 H Q! w
@3 \! g$ G/ g2 f
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。
U) Y) ]9 F" l/ S. {5 |2 P! x2 y$ O7 k$ v% g. O6 S
这是四二法则中的“二”。+ d+ q/ a' \. \
& B# Z; ?/ ^6 c. `$ U- ] H$ E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。
7 I+ a# K* {$ ^3 l! d6 K' P+ E& |0 k* B3 n
比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。$ G" `/ L3 a: u. w) p
- T4 W1 y6 p9 h% f" |' T+ }不一样的是,你有两轮机会来等5或者10,共8张想要的牌; C6 i( F) G1 K0 j9 z. O
) {" O- J- A3 @0 `* j
那么两轮内你中顺子的概率为:" N! g! a+ W! B
$ |9 I" J* h+ W
1-(47-8)/47*(46-8)/46=0.3145,即约为31%。# T: E- h; K; {+ e8 q5 X) C" [3 e
2 \$ S6 B- T$ \3 D, w3 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。: n0 m ]* ^# n2 ]
4 c* V& T% c3 ^6 ^这就是四二法则中的“四”。
/ n& q% f* \6 `8 h U( {" I2 N
4 P( M2 H, p, I& K9 K- Q: J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。4 K( ^/ J& z7 [9 J/ W
# `) g5 D. Y2 N$ L3 j2 b |
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