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21点算牌与当日冲销类似,坐在赌桌等机会,算到好牌下大注。$ ]- J7 V# V) S* D9 [
算牌时将牌分成小牌(2-6)及大牌(10JQKA),789不重要不算。自第一手自0开始看到小牌加1大牌减1。5 H$ o, \  H! W, f
依剩馀副数调整真数供下注及打牌参考。# {. U: W. l  R; u
假设你面对6副牌基本输率0.25%赌桌,算到真1平均赢DC0.25%,应该下多少钱?下几手?每一真1算牌客平均多赢0.5%,真2赢0.75%,真3+1.25%。
# y0 `6 q0 Q4 j7 S5 i2 J真数愈高表示看到小牌多剩下大牌多庄家(必须补到17点)易爆,大牌愈多算牌客应少加牌、多投降、多赌倍、多分牌。
3 M5 G& o3 X  d, e3 t6 _例如基本策略12 versus 庄3加牌,真2以上时不加。打多大打几门依赌本,风险偏好及同桌门数而不同。
+ w# J. I8 H3 F4 |假设使用50万美元,依半凯利下注……面对1%获利机会下1/2%的赌本,赌本加倍前输光的风险约1.8%(平均98.2%可以成功把赌本加倍)。
9 Q- h& W+ @5 }/ a) b/ s玩21点时下注后还会分牌及赌倍使下注增加,因此2%收益率不应下1%赌本,而是1%的76%……0.76%。  q- |$ `5 Z4 m" C4 i2 L" K
如果只下一门0.76%但下二门风险分散总下注额可以增加46%……下一门0.76%,下二门二门各0.56%合计1.12%,下三门总下注额可以增加71%!下三门各0.43%,合计1.3%。2 M; }* y4 P% Y1 W  P. j, Z
把500,000赌本代入,各种情形之下注额如下:
* C' d2 g; D% m$ G* i. {9 K" m+ s下一门 下二门合计 下三门合计
8 J1 p, d1 Q  |6 A真1 500 700 8009 r( {1 u; S2 Y8 l  n! K! h! N4 J; @
真2 1400 2100 2400
+ p9 P/ ~* }( z% p) n2 d, Z真3 2400 3500 4100* s+ h, S' Q  w
真4 3300 4900 5700  F3 H. [3 _& D1 G0 l
真5 4300 6200 7300
2 t! w; z" g8 L1 V( u真6 5200 7600 8900& ?2 h, p- A3 I+ O0 ~/ F( p
真7 6200 9000 10,600
( I" x" A: S3 H  D5 I8 ~- H+ V如果有选择,好牌时应该下几门?
) f$ B: {& p5 H: {0 ]- E% {7 I/ {Don Schleisinger在《Blackjack Attack》一书中分析如下:
8 L1 P, Y) h1 e8 H+ B+ A假设你打7位赌桌,单独打,同桌有另一人,另二人,另三人,另四人,你打几门最好?假设顶注500元一人下一门100次约540张牌(平均一轮一位用2.7张牌),下二门只能下67次(540÷8.1)下三门下50次(540÷10.8)则风险相同下(一门下500元风险与二门共下730元及三门共下855元风险相同)下一门总下注额最高:
% y6 `( E. i) Q# Z/ [一人打 下注次数 总下注额
; {, D' @3 h% m( i下一门 100 50,000*
, F  N7 A, p2 V0 Q下二门 67 48,910
. r9 K, I$ D$ Y: U下三门 50 42,750
$ h. r% ?6 m, k) ^+ |*即风险相同下下一门总下注额最高(获利最高)。
5 j# ~8 Z* B4 e; e若同桌有另一人下一门:
4 x8 `# [7 t# ?; i% l8 c8 ^: Y$ O6 H二人打 下注次数 总下注额
* q& S4 f- l$ L" d" c你下一门 67 33,520
' H" Z  L. j  R: {你下二门 50 36,500*5 V8 H* d% {2 v& d" z" |
你下三门 40 34,2002 m6 m7 u" y) d3 z. \
*即下二门总获利最高。/ d' p  M6 F$ N! B# u' s* t
若同桌有人下二门:
3 M6 O9 x- V' @  `$ ^三人打 下注次数 总下注额
4 w% S9 T9 U( Q你下一门 50 25,000
3 y5 c# Y3 C8 I( N  r你下二门 40 29,200*
$ o3 h" f. [! m  x0 D1 b, [你下三门 33 28,215
+ W, P  ]6 j2 n  e% }*也是下二门总获利最高。
( \: d$ U( |1 I5 w! s  \5 ?8 ~若同桌有人下三门:
, T; d9 c/ j9 D4 h: `# W. ]四人打 下注次数 总下注额+ ]2 w4 c0 }; `
你下一门 40 20,000
8 [7 C; \* L! w7 Q$ L8 _你下二门 33 24,090
3 R; a$ B+ Q- f" S  L9 o你下三门 29 24,795*& P5 O, m* V" M+ J
*下三门好。; c$ a' ?- E- Y" y+ j  M( u* E' u
五人打 下注次数 总下注额6 ]7 U. J8 K  O* K
你下一门 33 16,520
7 p. b' h" a! h你下二门 29 21,1700 M! k! ]# ]  q  T" q* R1 o/ \
你下三门 25 21,375*- Y, t  J8 D  |0 s/ |5 F
*下三门好。* \# T0 l) w7 p# c/ _  }% O
综合而言,在上限以内时,一人打打一门,二人打打二门,三人打打二门,四人及五人打打三门,但若仔细看其实一律打二门与最适打差得有限。如一人打时只差2%(50,000与48,910比),四人打差3%,五人打差1%因此好牌时一律打二门无妨。3 u6 W8 V5 O* Z- |1 c1 Q
注意「上限以内」为前提。
$ ~3 ]1 g' t  p8 F. `# A如果上限为500,好牌应下1000,则即使只一人打也应打二门甚至三门,又最后一回不必省牌多打几门无妨。
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:) :( :D :'( :@ :o
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:loveliness: :funk: :curse: :dizzy: :shutup: :sleepy:
:hug: :victory: :time: :kiss: :handshake: :call:
:) :( :D :'( :@ :o
:P :$ ;P :L :Q :lol
:loveliness: :funk: :curse: :dizzy: :shutup: :sleepy:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory:
:) :( :D :'( :@ :o
:P :$ ;P :L :Q :lol
:loveliness: :funk: :curse: :dizzy: :shutup: :sleepy:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory: :time: :kiss: :handshake: :call:
:hug: :victory: :time: :kiss: :handshake: :call:
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