In which episode does Hawkeye play the made up game cranko?

Season 6, episode 18, "Your Hit Parade. The game is a combination of Chess, checkers, Poker and gin rummy. Here are some of the rules:

-a checker can't be kinged (like in checkers)

-if it's in check (chess) and a player has a gin hand, both players have to drink from the distillery

-bishops are worth three jacks

-checkers are wild

-have to be 21 or over to open