By adopting this arrangement, teams can be directly and reasonably arranged to play in their own venues. Therefore, when each team has its own venue conditions, this arrangement should be adopted.
Adopt a serpentine arrangement. No matter whether the number of teams is odd or even, they are arranged in odd numbers. When the number of teams is even, they are arranged in odd numbers slightly less than the number of teams. Before arranging, calculate the number of rounds, and draw the same vertical parallel lines as the number of rounds according to the number of rounds. Then write the number of the first half on the left side of the first line from top to bottom, the number of the middle part below the first line, and the number of the second half on the right side of the first line from bottom to top, that is, between the first line and the second line and between the upper end of the second line, write the left and right sums of each line in turn. Then use horizontal lines to connect the corresponding numbers around each row, and the numbers around each row and the numbers above and below belong to a circle. For example, five teams participate in the competition, and the arrangement is as follows:
Draft the contents of the competition as follows:
The first, second, third, fourth and fifth rounds.
1—5 1—0 2— 1 2—0 3—2
2—4 5—2 3—5 1—3 4— 1
3—0 4—3 4—0 5—4 5—0
To verify the correct arrangement, the upper left corner of the first circle segment and the lower right corner of the last circle segment must be "1", and the lower left corner of the first circle segment and the upper right corner of the last circle segment must have the same number. Otherwise, the arrangement is wrong.
After arranging the game sequence table, before drawing lots, it is necessary to determine whether to play in the field on the left side of the winding or on the right side of the winding. Table 7 shows the team's field games on the left side of the circular line.
Table 7 Determination of location
1 team venues
1—5
1—3
Team 2 venue
2—4
2— 1
Group 3 venues
3—5
3—2
Group 4 venues
4—3
4— 1
Group 5 venues
5—2
5—4
In this way, five teams participated in the competition, and there were 10 games in five rounds of * * *. It's each team's turn to play two games on the field, with equal opportunities.
If the number of participating teams is even, because they are arranged in odd numbers, there are no competitors in the numbers below and above each line, so the last number should be arranged to the right of the number below and to the left of the number on the line. For example, six teams participate in the competition, and the arrangement is as follows:
Draft the contents of the competition as follows:
First round, second round and third round