How it is now:
Shaktar - 7 points - 4 games
Chelsea - 7 points - 4 games
Juve - 6 points - 4 games
If Shaktar and Chelsea win against FC Nordsjælland:
Shaktar - 10 points - 5 games
Chelsea - 10 points - 5 games
Juve - 6 points - 4 games
Let's say we win against Chelsea and draw Shaktar (it could also be beating Shaktar and losing against Chelsea):
Shaktar - 11 points - 6 games
Juve - 10 points - 6 games
Chelsea - 10 points - 6 games
We are going through this way because we're better head to head against Chelsea. It's the same thing if we draw Chelsea and win against Shaktar.
The good thing about Chelsea beating Shaktar is that our chance to win the group is much larger now. The bad thing is that the chance to get through on a second place is smaller.