Also known as Cho Ka Han Ka, or simply Cho-Han.  A very simple and traditional Japanese gambling game played with two dice and stakes.  This game is often portrayed in Yakuza (Japanese gangster) movies and was very popular with bakuto, itinerant gamblers in old Japan.

A dealer will shake the two dice, traditionally in a bamboo cup or bowl, and then upturn the dice cup onto the floor.  Players then place their stakes on whether the total will be "Cho" (even) or "Han" (odd). The dealer then reveals the dice and the winners collect their money.

The dealer will sometimes act as the House, collecting losing bets. But usually, players will bet against one and other (requiring an equal number of bets on odd and even) and the House collects a percentage of winning wagers.