Myths with trolls - scripted decisions chapter
Almost in every season, a team "must" have 1-2 troll results.
Well, I think it's true.
A troll result it's not only against weaker teams but also vs good teams (usually when oppo manager isn't watching).
There are some "signs" it troll games.
One sign is a "fixed" red (from two yellows) card.
Here is a game of a friend.
When he saw that his player Cadenet at 44' got a yellow card, he made a sub
The game didn't made the sub, kept him in the game and at 57' he got the second yellow >red card.
After that, oppo scored twice.
Click image for larger version. 

Name:	red card 1.jpg 
Views:	111 
Size:	48.6 KB 
ID:	58394

Here we can see the min, he got the 2nd card. The order for the sub was given in the break but he's still playing (to get the card ).
Click image for larger version. 

Name:	red card 2.jpg 
Views:	111 
Size:	52.1 KB 
ID:	58395