Black Jack Appendix 11
There are some sources that address the question of the probability of doubling a bankroll before losing it
in a card counting situation. Ken Uston's Million Dollar Blackjack to
name one. This appendix shall not recover that issue. However it comes up often
how much the basic strategy should bankroll given a targeted number of hands to
play. This is especialy practical if the player must play a certain number of
hands to earn an online casino bonus.
The rules assumed for these tables are six decks, dealer stands on soft 17,
player may double on any two cards, player may double after splitting, player
may resplit to three hands, no surrender, dealer peeks for blackjack. Under
these rules the house edge is .4140%.
Let's look at an example of how this table can be used. Assume the player
makes a deposit of $1000 to an online casino and is required to bet through
$5000 in action. Assume the player is willing to accept a 5% risk of ruin and
wishes to play only 500 hands. How much should the player bet every hand? My
table shows the player should purchase 52 units. $1000 divided by 52 is $19.23.
So by betting $20 a hand the risk of ruin should be just over 5%.
Risk of Ruin |
Number of Hands to Play |
| 100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| 50% |
7 |
11 |
14 |
16 |
18 |
20 |
22 |
24 |
25 |
| 40% |
9 |
14 |
17 |
20 |
23 |
25 |
27 |
29 |
31 |
| 30% |
12 |
17 |
21 |
25 |
28 |
31 |
33 |
36 |
38 |
| 20% |
15 |
21 |
26 |
31 |
34 |
38 |
41 |
44 |
47 |
| 10% |
19 |
27 |
34 |
39 |
44 |
48 |
53 |
57 |
60 |
| 5% |
22 |
32 |
40 |
46 |
52 |
58 |
62 |
67 |
71 |
| 4% |
23 |
34 |
42 |
49 |
55 |
60 |
65 |
70 |
75 |
| 3% |
25 |
36 |
44 |
51 |
58 |
64 |
69 |
74 |
79 |
| 2% |
27 |
38 |
47 |
55 |
62 |
68 |
74 |
79 |
84 |
| 1% |
29 |
42 |
52 |
61 |
68 |
75 |
82 |
88 |
93 |
| 0.5% |
32 |
46 |
57 |
66 |
74 |
82 |
89 |
95 |
101 |
| 0.25% |
35 |
50 |
61 |
71 |
80 |
88 |
96 |
102 |
109 |
| 0.1% |
38 |
54 |
67 |
77 |
87 |
95 |
104 |
111 |
118 |
| 0.01% |
45 |
64 |
79 |
91 |
102 |
112 |
122 |
131 |
139 |
Risk of Ruin |
Number of Hands to Play |
| 1000 |
1200 |
1400 |
1600 |
1800 |
2000 |
2500 |
3000 |
| 50% |
27 |
30 |
32 |
35 |
37 |
40 |
45 |
50 |
| 40% |
33 |
37 |
40 |
43 |
46 |
49 |
56 |
62 |
| 30% |
41 |
45 |
49 |
53 |
56 |
60 |
68 |
75 |
| 20% |
50 |
55 |
60 |
65 |
69 |
73 |
83 |
92 |
| 10% |
64 |
70 |
76 |
82 |
88 |
93 |
105 |
116 |
| 5% |
76 |
83 |
90 |
97 |
104 |
110 |
124 |
137 |
| 4% |
79 |
87 |
95 |
102 |
108 |
114 |
129 |
143 |
| 3% |
83 |
92 |
100 |
107 |
114 |
121 |
136 |
151 |
| 2% |
89 |
98 |
107 |
114 |
122 |
129 |
145 |
161 |
| 1% |
99 |
108 |
118 |
126 |
134 |
142 |
160 |
177 |
| 0.5% |
107 |
118 |
128 |
137 |
146 |
154 |
174 |
192 |
| 0.25% |
115 |
126 |
137 |
147 |
156 |
166 |
187 |
206 |
| 0.1% |
125 |
138 |
149 |
160 |
170 |
180 |
202 |
223 |
| 0.01% |
148 |
162 |
175 |
188 |
198 |
212 |
236 |
261 |