When Keno first arrived in Nevada, each number was accompanied by that of a race horse, but when operators did not want to be associated with horse racing they chose to omit the horse name. Still, referring to a new session of Keno is now known as the next “race”
Playing the Game
Players are given a grid 1-80 split over 8 rows of 10. The player then selects a set of numbers known as spots (normally between 1-10 spots but can vary). The software will then select 20 numbers at random. If your numbers are picked, and the same number can be picked more than once, the more that happens the more you could win.
The payouts on Keno payouts are based on how many numbers the player has chosen and how many of those numbers are "hit" -- this is then multiplied by the proportion of the player's original bet to the "base rate" of the pay table. Essentially, the more numbers that a player chooses and the more numbers hit, the greater the payout will be.
The amount you can win depends of course on the pay table at the casino, as these have usually a larger edge for the house than other games. The house edge will run from less than 4% to over 35% -- the typical house edge for a non-slot casino game is under 5%