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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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' t9 N2 ]" ?. s/ o6 e% Z L L' @, M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。
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$ `, N" k) q. U8 E3 {严格来计算德扑概率应该这样:
! {2 i( H- Y0 h& |4 x/ y. @; f' x" L. {8 \
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;& a! J1 \: f. d
3 }, ]. s+ | g
你想要的牌是4张5和4张10,共4+4=8张。
2 g7 P e" E/ \, x" d0 P% c* ~: ^% l7 F6 b+ T. h
那么此时,你在河牌中顺子的概率为:8/46=0.1739,即17%。
4 L2 y7 D' @4 Z! u$ O5 v0 f8 R4 Z% v5 ]( W. R. D
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,. y. e2 ^. z) y4 v$ }
* I' n5 c, v# 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。
1 K. u. {0 y& E$ U1 v1 v& }
1 }5 V# T/ r3 K' T这是四二法则中的“二”。
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$ e/ R% n$ u! t& 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。- l u' \6 {' ~9 W+ x
9 s) s8 `* Z. h, U: }7 r比如桌子上翻牌为A-6-7,你的手牌依旧是8,9。) N1 m; d- I! O) [. Q+ d5 {$ h
* T- K3 a; g. C6 V不一样的是,你有两轮机会来等5或者10,共8张想要的牌
, A2 r5 i; [' Q+ b2 L1 @8 E/ R4 [8 ]# [( P
那么两轮内你中顺子的概率为:1 N( ? |# r/ t; C7 s
* j% f4 I9 v5 S! X; T( x1-(47-8)/47*(46-8)/46=0.3145,即约为31%。
! r/ Z! l% S; x' m+ W3 I5 h! Y; H i& O" t( G: g
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。
5 o# z! e: f0 \! h8 R/ k& Z- h- ~; D9 f, [0 t2 s0 J4 K% \( M3 g
这就是四二法则中的“四”。/ L- ]& |1 @; H0 ~4 v. L
; q# V; e3 Y0 E0 y0 G: L5 F0 s5 `; 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 _7 G5 _' o, F0 @
: t5 e" q/ a1 c) K; G
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