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.g    Top Bottom

Last Update: August 8, 2005

Rules

Top Bottom is a video keno variation found on some machines that support multiple games. The player chooses "top" or "bottom" and is paid according to the number of 20 balls chosen by the game to fall in the player's half.

Return

The following table shows the pay table according to the number of catches, the probability of each, and contribution to the total return.

The returns for 5-cents were about 2.5% less, except for the pick 1.

Top Bottom Keno
Catches Pays Combinations Probability Return
20 12500 137846528820 0.00000004 0.00048739
19 5000 5251296336000 0.00000149 0.00742691
18 558 88436604204000 0.00002502 0.01395848
17 180 876675902544001 0.00024798 0.0446358
16 32 5744053569793500 0.00162476 0.05199244
15 12 26468598849608400 0.00748691 0.08984294
14 3 89077015359259200 0.02519634 0.07558901
13 2 224342112756653000 0.06345744 0.12691488
12 1 429655207020554000 0.12153233 0.12153233
11 0 632136396535987000 0.17880619 0
10 0 718528370729238000 0.20324303 0
9 0 632136396535987000 0.17880619 0
8 0 429655207020554000 0.12153233 0
7 2 224342112756653000 0.06345744 0.12691488
6 3 89077015359259200 0.02519634 0.07558901
5 12 26468598849608400 0.00748691 0.08984294
4 32 5744053569793500 0.00162476 0.05199244
3 180 876675902544001 0.00024798 0.0446358
2 558 88436604204000 0.00002502 0.01395848
1 5000 5251296336000 0.00000149 0.00742691
0 12500 137846528820 0.00000004 0.00048739
Total 3535316142212170000 1 0.94322802

The lower right cell shows a return of 94.32%.

Other Keno Links

  • keno Main keno section.

  • Keno appendix 1 features an analysis of the top/bottom/left/right as as well as edge tickets as played at the Las Vegas Hilton.

  • Keno appendix 2 features an analysis of Caveman Keno as played on IGT's Game King.

  • Keno appendix 3 probabilities and returns for basic keno at the Atlantic City Tropicana.

  • Keno appendix 4 progressive keno at the Orleans. Learn when the meter is high enough to have a positive expectation.

  • Keno appendix 5 Nevada numbers, a progressive lottery game at some of the Nevada Park Place casinos.

  • Keno appendix 6 Australian Power Keno.

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