Yutnori is a game of both chance and strategy involving four wooden sticks, called yut (윷), which are tossed, much like dice, to determine how far and in which direction a player's tokens, or mal (말), may be advanced around a board.
If one stick lands face up, it is called do (도), meaning "pig," and this results in a player moving a token one space. 2 sticks is called gae, which means "dog" and allows a player to move two spaces. 3 is geol (걸), or "cow," and 4 is yut (윷), or sheep, resulting in 3- and 4-space moves, respectively. If all 4 sticks land flat-side down, this is called mo (모), or "horse," and a player's token is moved 5 spaces.
These, of course, are just the basics. There are many more complicated rules and variations involving tokens riding piggy-back, "pregnant" token spaces, tokens getting sent back to the start, and the always fun "back do." For more detailed rules, click here.
Here's one of my students getting ready to toss the yut.
Traditionally, Yutnori is played on Lunar New Year's Eve.