Hello!

I got two question about the game blitzball and I would be grateful if someone could help me:

1. What affects the fact which players respectively which team the ball gets at the beginning of a game or after a goal? Is it just random?

2. If the contract of an enemy player expires, what affects the decision of the enemy team to extend it? Is it also random? Are there players they never give away? What chance do I have to get this player?

Thanks for answers!