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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)
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        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)。 ) c& r0 m# |8 P  E5 |- V
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( o4 T0 M" O- U        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:
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, J# ]; [4 n$ i3 E5 W(17.2%*1) + (78.9%*-1) + (3.9%*0) = -0.617 ! G1 H2 B% |4 _" Y
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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。
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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:
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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。 + I' [  Y& |# d5 d  c

0 D  J/ V4 T' k5 l" H(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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(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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3 J  b6 Q, i5 m$ b7 K" e(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。 ! v! N; R2 A, G; o  G9 i
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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。 & S3 C8 s- c# V8 M; l* G
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        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。
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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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: J: p' l8 ]" k' j& Y7 V        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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+ A8 t% o. }( L" m$ H) L        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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; S! h0 k. O4 x4 Y5 f( 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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