as described in a gaming guide from The Boulder Club, circa 1949

"for highest odds......
play RACE HORSE KENO

If you're really feeling lucky, here's a game that will pay you odds as high as $3,600.00 for $!.00! And it's a very easy game to learn:

First, you mark any ten horses on a Keno Card and hand it to the dealer with your bet...which may be from 15¢ up.

Then, when the Race starts, you watch the numbers on the Keno Board---which light up as the numbered balls are automatically removed from the cage, at random. If five of your numbers appear on the Board, you double your money. Also...

6 horses pay........18 for 1

7 horses pay.......180 for 1

8 horses pay.......900 for 1

9 horses pay......1800 for 1

10 horses pay 3600 for 1

There are many other ways of playing...and our Dealers will be happy to explain!"