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Keep a small bowl of 30 beans on the table and appoint 1 person from each team to be their team's official scorekeeper. At the end of each trick, have the scorekeeper take beans from the bowl to represent your team's score. Keep these beans in front of the scorekeeper on the table to that everyone can see the tallies. If you don't have dry beans, you could use other small tokens. In the game of Truco, the total points you need to win (30) are divided in half. The first 15 points are called the "bad" points. Once you cross 15, all your points automatically transfer to "good" points, or "buenas." This distinction is somewhat arbitrary because the first person to 30 points wins. If the game ends and you only have "bad" points, that doesn't change anything in future games. After you cross the threshold of 15 points, you're on your way to winning the game! It's possible for both teams to have "good" points at the same time, but the first one to get to 30 will be the winner. Some groups will play the best out of 3 games, prolonging the time spent playing. Others will just play to 30 and declare that the team who won that game is the ultimate winner. Feel free to make adjustments to how you and your friends play. For example, you could decide to play to 15 points if you have an abbreviated amount of time available; or you could decide to play to 100 pointsit's up to you. If both players cross 30 points in the same hand, the team with the highest score wins. It's possible that you and your opponents could both cross 30 points in the same hand and end with the same score. If this happens, play another hand (and then another, if needed) until one team gains more points than the other. That team is the winner! Having a tie is pretty unusual. Chances are, you won't run into this situation very often.
Use dry beans to keep score in the traditional way. Complete the first half of the game by getting 15 "bad" points. Start earning "good" points once you have more than 15. Win the game by getting 30 points. Deal with a tie by playing more hands until someone pulls ahead.