Used as Death Match of Season 1, Rounds 3, 4, 10.
Basic yutnori rules apply, as follows. Wikipedia is also pretty complete.
The game uses a special yutnori board. Players cast yut sticks which can be “up” (plain) or “down” (marked). There are thus four sticks cast. The number of up sticks is the player’s score: one up stick is 도 (do), scoring one space; two up sticks is 개 (gae), scoring two spaces; three up sticks is 걸 (geol), scoring three spaces; four up sticks is 윷 (yut), scoring four spaces; and no up sticks is 모 (mo), scoring five spaces, unlike the others. In addition, yut and mo also allow the player to cast again, thus possibly accumulating several yuts and mos before a different cast is thrown.
Each player has two pieces on the board. After a move, the player can move any of their pieces for the score cast. In case of yuts and mos, they can choose where each cast goes to, but a cast can be only used for one piece. (For example, with a yut and a gae, one can use them to advance a piece six spaces (4+2) or a piece four spaces and another two spaces, but not split them into three and three.)
Normally, pieces travel along the outer edge of the board. However, when a piece lands on a corner or the center of the board, it has the option of following a different, shorter route. Note that the piece must land on the corner or the center to allow the alternative route; simply passing by doesn’t count.
When a piece lands on another of its own, the two may decide to merge and continue together. When a piece lands on an opponent’s, the opponent piece is returned back to home and the player gets another cast. (It seems that if one gets a yut or a mo in this new cast, it doesn’t give another cast.) A player wins if they get both pieces back to the home after circling the board.
That concludes yutnori rules. However, as this is a tactical yutnori, additional rules are in place.
The two Death Match players each chooses a partner. The partners also play, but they cannot win. Each player holds two sticks, one is “up” on both sides and one is “down” on both sides, and each throws one stick of their choice. (Teammates may discuss, of course.)
In addition, there is a variant called “back do”. If one gets a do, instead of advancing by one space, a piece is retracted by one space. (If one doesn’t have any piece on the board, the turn is skipped.) Note that this allows a piece to retract back to home and beyond by back dos, and it’s still counted as circling the board.