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Bridge Probabilities and Combinatorics



Bridge Probabilities and Statistics - Point Count

Computer Program by Bill Butler

What is the probability that you will be dealt a hand worth "N" points?


   One of the best methods of evaluating the strength of a hand is by adding up the point count. This method awards 4 points for every Ace in a hand, 3 points for each King, 2 points for each Queen, and 1 point for each Jack. Additional points are awarded for distributional strength such as a short suit, but here we will just give the probabilities for raw honor count power.

   The highest possible honor count that can exist in a hand would have all four Aces, four Kings, four Queens, and one of the four Jacks for a total of 37 points. At the other end of the scale there are over 2 billion hands that have a zero point count (10 high or worse). Of these, COMBIN(32, 13) = 347,373,600 are Yarboroughs (9 high or less). We also note there are COMBIN(52, 13) = 635,013,599,600 different hands that could be dealt.

   For each row in the table below, column 1 gives the point count via the 4, 3, 2, 1 analysis. Note that there are many combinations that can produce a given count. For example a hand that has 2 Aces and a Queen, or another hand that has 4 Queens and 2 Jacks would both be included in the "10" row.

   The second column shows the exact number of possible hands that will produce the given point count (Honors only - distribution is not counted). For the third column we divide the total combinations in the second column by the total number of all hands (635,013,559,600) to get the probability of being dealt this particular point count. The fourth column gives the cumulative probability of receiving a particular point count or higher. Finally the fifth column shows the average number of honor cards that a hand will have, given that the hand has a particular honor count.

   High point count hands have a very low probability, and hence scientific notation is used. For example, to express the probability of getting a 37 point hand as a fixed point decimal number, you have to move the decimal point 12 places further to the left (e.g. .00000000000629908)


Honor            Total       Honor Count       Cumulative     Avg. Nbr.
Count            Hands       Probability       Probability    of Honors
-----------------------------------------------------------------------
  37                 4       6.29908 E-12      6.29908 E-12    13.0000
  36                60       9.44862 E-11      1.00785 E-10    12.4000
  35               624       9.82656 E-10      1.08344 E-09    12.0769
  34             4,484       7.06127 E-09      8.14471 E-09    11.4585
  33            22,360       3.52118 E-08      4.33566 E-08    11.2161
  32           109,156       1.71896 E-07      2.15252 E-07    10.6851
  31           388,196       6.11319 E-07      8.26571 E-07    10.4401
  30         1,396,068       2.19849 E-06      3.02506 E-06    10.0376
  29         4,236,588       6.67165 E-06      9.69671 E-06     9.7116
  28        11,790,760       1.85677 E-05      2.82644 E-05     9.4187
  27        31,157,940       4.90666 E-05      7.73310 E-05     9.0614
  26        74,095,248       0.000116683       0.000194014      8.7857
  25       167,819,892       0.000264278       0.000458292      8.4670
  24       354,993,864       0.000559034       0.00101733       8.1655
  23       710,603,628       0.00111904        0.00213636       7.8697
  22     1,333,800,036       0.00210043        0.00423679       7.5769
  21     2,399,507,844       0.00377867        0.00801546       7.2797
  20     4,086,538,404       0.00643536        0.0144508        6.9817
  19     6,579,838,440       0.0103617         0.0248125        6.7023
  18    10,192,504,020       0.0160508         0.0408634        6.3982
  17    14,997,082,848       0.0236169         0.0644803        6.1113
  16    21,024,781,756       0.0331092         0.0975895        5.8196
  15    28,090,962,724       0.0442368         0.141826         5.5275
  14    36,153,374,224       0.0569332         0.198760         5.2273
  13    43,906,944,752       0.0691433         0.267903         4.9381
  12    50,971,682,080       0.0802687         0.348172         4.6450
  11    56,799,933,520       0.0894468         0.437618         4.3279
  10    59,723,754,816       0.0940511         0.531669         4.0415
   9    59,413,313,872       0.0935623         0.625232         3.7356
   8    56,466,608,128       0.0889219         0.714154         3.4192
   7    50,979,441,968       0.0802809         0.794435         3.0811
   6    41,619,399,184       0.0655410         0.859975         2.8059
   5    32,933,031,040       0.0518619         0.911837         2.4620
   4    24,419,055,136       0.0384544         0.950292         2.0525
   3    15,636,342,960       0.0246236         0.974915         1.7448
   2     8,611,542,576       0.0135612         0.988477         1.4186
   1     5,006,710,800       0.00788442        0.996361         1.0000
   0     2,310,789,600       0.00363896        1.000000         0.0000



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