How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 4/2100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Botafogo 2 Flamengo 2 -8.0
-2.6
-0.3
Madureira 1 Fluminense 3 -2.8
-0.4
-0.1
Vasco da Gama 1 Volta Redonda 1 +1.0
-0.1
+0.1
Bangu 2 Boavista 1 +2.3
+0.1
Week of 4/9100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Vasco da Gama 1 Madureira 0 -1.8
-0.1
Volta Redonda 0 Fluminense 2 No
+3.0
-0.0
Botafogo 1 Bangu 0 +0.9
+11.4
+0.6
Flamengo 3 Boavista 0 -1.0
-0.1
Week of 4/17100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Boavista 0 Botafogo 1 +0.4
Bangu 0 Flamengo 3 -0.1
Fluminense 0 Vasco da Gama 1 -0.1
Points
Chance Will Win Championship