八个队分别用ABCDEFGH代替第一轮:A-B,C-D,E-F,G-H第二轮:A-C,B-D,E-G,F=H第三轮:A-D,B-C,E-H,F-G第四轮:A-E,B-F,C-G,D-H第五轮:A-F,B-E,C-H,D-G第六轮:A-G,B-H,C-E,D-F第七轮:A-H,B-G,C-F,D-E
7+6+5+4+3+2+1
a b c d e f g hbcdefgh