Choboichi
Choboichi is a simple gambling game played in Japan using one covered die. The dealer shakes a six-sided die in a cup or rice bowl and then places it upside down, concealing the rolled value; after the players wager for their prediction of what the value will be, the dealer reveals the die by lifting the cup.
Gameplay
The dealer is known as the dōtori, while the bettors are the hariko; the dealer is the one who holds the cup, known as the tsubo or tsubozara. The role of the dealer may either be fixed to one person or rotate amongst the players.Players wager by placing money on one of six spaces on the game board. Winning wagers are paid out typically at four-to-one while the dealer keeps the losing bets. The winning payout may vary between 2:1 and 5:1.
Consider a player who places a total bet of, with wagered on each space: one space will win, and the player will receive × for that bet, but the other five spaces will lose, costing the player. The difference between the amount the player loses and the amount won is the house edge; with a multiplier of 4, that difference is, which is of the initial bet. Formally, the house edge is computed using the relative probabilities of winning and losing along with the winning multiplier, :
The house edge varies from % to %, with the most common multiplier of 4 resulting in a house edge of %.
There are multiple variations using up to five dice, although multiple-dice games generally have different rules, including Chō-han and Cee-lo.