Since the ancient times sport has been very popular and good cheer. The first official sport has been the stade. It was a simple 192.28 meters long race with simple rules. Naked runners were running and the one who reached the finish as the first won. Since those times sports has developed a lot. Today there are hundreds of thousands of sports worldwide. People play them just for fun or as a profession. Because of human’s competitiveness, nowadays there are numbers of types of tournaments. A good example of tournament is the “everyone against everyone”. This system is designed in a such a way that everyone has to play against everyone and the winner is the sportsman or the team with most points scored. The disadvantage of this system is the number of matches. You have to play many matches to win and it is How to organize such a tournament: 1. One to organize this type of tournament is to use this system. The numbers represent different teams/players. The first number in each bunk is chosen in order from the lowest to the highest. The second number is chosen by subtracting numbers one by one from the highest. 1st event 1 - 6 2 - 5 3 - 4 The highest number of the team is alternately put to the left and right side of the top column. Then replace the number, which is the first in the second half of the list of the teams, with number 1 in the next column. Number 4 is the first number in the second half of the list of the teams Number one is in the same place as number 4 were in the previous column. This rule has an exception in the 1st column because number one is put there because of the numeric order. 1st event 2nd event 3rd event 4th event 5th event 1 - 6 6 - 3 5 - 6 6 – 2 4 - 6 2 – 5 4 – 2 1 – 4 3 – 1 5 – 3 3 - 4 5 - 1 2 - 3 4 - 5 1 - 2 We could get the final number of the events by using a simple formula: X = n . (n - 1) 2. The other way is to use logic and let the teams with similar strength play against each other in the first events. The other example of tournament is the Ice Hockey World Championships. At the beginning there are groups named with letters A-F. In each group there are 4 teams. Every team plays against everyone in their group. They get points for winning and at the end the last two teams in the group loose. The winners of the basic groups go to semi-final. At first they have to go through quarter-final, then semi-final and then final. If they win their way through the matches they become world’s champions. Play off Quarter-final Semi-final final A Country Country Country Country Country Country B Country Country Country Country Country Country C Country Country Country Country Country Country D Country Country Country Country Country Country Country Country Country Country Country Country Country Country Country 3rd Country Country 1st Country 2nd