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[真人] 读书心得分享之二《The Pro's Guide To Spanish 21 And Australian Pontoon
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Pontoon策略与Black Jack策略之差异:两张牌硬17对庄A要加牌(Hit) # ^* N; R6 t  ^# ?8 m$ U' \
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+ y; F" `3 e! \6 J% r        当起手两张牌拿到硬17,但是庄家却拿到A时,通常也是最令人讨厌的情境,不亚于读(书心得分享之一)提到16对庄家7以上的尴尬情况。熟悉Black Jack策略表的玩家都知道,硬17对庄A应该要停牌(Stand),这是由于Black Jack一副牌总共有13张牌,庄家补到Black Jack的机率较高;但是若换成Pontoon时,一副牌只用12张牌,抽调10点不玩,小牌比例多一些,庄家要补到Natural(或称为Pontoon,即A加Picture共两张牌合计21点)的机率比Black Jack低一些,所以我们反而要选择要牌(Hit)。
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        Pontoon赌桌通常规定,若庄家拿到A玩家是不能投降(Surrender)的,这是因为庄家拿到A再补第二张牌会爆牌(Bust)的机率只有13.1%而已(H17,NHC),对DC非常有利,所以不让玩家投降。书中分析八副牌Pontoon,当两张牌硬17对庄A的期望值,若选择停牌(Stand),期望值是-0.679;若选择加牌(Hit),会有17.2%的机率获胜,78.9 %的机率失败,而平手的机率只有3.9%。期望值计算如下: * K% R9 ]4 k8 I9 z0 o

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# C. Z) M# q8 ]1 \0 z: ~  {9 c4 Q(17.2%*1) + (78.9%*-1) + (3.9%*0) = -0.617
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0 o9 s* ~$ s' K( f& U$ t两者同样是玩家容易输的局面,但是选择加牌(Hit)的期望值比Stand高一些。 / b- G; H2 w# a5 M
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        遇到两张牌硬17对庄A这种情况,玩Pontoon选择Hit,会比玩Black Jack选择Stand的期望值还高,主要有五个原因: & }0 {0 c# p' h7 G" R- Z
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(1) 若你玩Pontoon补到一张4点,凑到21点,庄家会立刻赔给你,而不像Black Jack要等庄家补牌,若庄家补到Black Jack你会被吃掉,若庄家凑到三张牌以上21点算平手。
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5 ?1 m2 d; y3 P( Z4 E7 k' m5 j(2) Pontoon要补到这张幸运的4,机率是1/12(即8.33%),而Black Jack一副牌有13张,所以机率是1/13(即7.69%),玩Pontoon比较容易拿到。
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$ g& u) g. K3 K- N3 M& {+ U(3) 若你补到A、2、3、4都不会爆牌,机率是4/12(即33.33%),而Black Jack相同情况下,不爆牌的机率是4/13(即30.77%) ,玩Pontoon比较不易爆牌。
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(4) 如果你选择Stand,17点的牌要获胜只有等庄家爆牌(Bust)才行,可惜庄家爆牌机率只有13.1%而已。
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(5) 如果你选择Stand,只有当庄家补到硬17点才行,当庄家补到一张A到6的牌时,庄家仍须补牌,所以要平手的机率只有7.7%而已,不像Black Jack规定Soft 17庄家就须停牌。 * D0 b  P) l9 f# ]; {- O& g5 w' T

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, M' Y/ o+ c' C/ j* ~        你在Pontoon赌桌上,几乎看不到玩家拿到两张硬17对庄A的情况,还会继续要牌(Hit),这些人不是恐惧爆牌心态,就是沿袭Black Jack的策略来玩,长期而言输率较高。当你发现拿到两张硬17对庄A,还继续要牌的玩家,恭喜你终于遇到难得一见的Pontoon高手。 ) E+ a4 p: c4 ^
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Pontoon赌倍之后拿到硬17对庄家A要投降:Forfeit
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        不同于一开始拿到两张牌硬17对庄A的情况,若你是在赌倍(Double或称为Buy)之后补到硬17点对庄家A,这时候要选择投降。在赌倍之后的投降叫做Forfeit,DC通常会开放,不会因为庄家是A就不让你在赌倍后投降,Forfeit可视为一种:赌倍后的救援(Redouble rescue)。
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$ h3 l- f0 t2 G7 {5 S+ Q: w        如果赌倍之后选择Forfeit,我们只输掉一单位,所以期望值是-1。如果赌倍之后选择停牌(Stand),有13.1%的机率会赢(因为这是庄家爆牌的机率),有5.7%的机率平手,有81.2%的机率会输,因此当赌倍之后拿到硬17对庄A不投降的期望值为:
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! k+ `4 r/ u2 M3 x" _  g* P, L( 2 * 0.1314 ) + ( 0 * 0.057 ) + ( -2 * 0.8115 ) = -1.36
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        此时投降(Forfeit)是比较正确的选择,因为我们可以省下36%的注码损失。有人会问若加牌(Hit)呢?因为赌倍之后筹码增加,加牌的风险更高,绝对不考虑。
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3#
看得出楼主对这很有研究
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