It seems there is a lot of info in the Danish forums, which is really a pitty. I'm using Google translate to check what's new there and stumbled in this quoted explanation for how tackling and cards are given:
FC Sunnyvale said:
It does not work in the same way as in the old battle simulator.
A random number is drawn between 0 and 99.
The number is compared to another number, called "tackling factor".
If the random number is higher than (94 - tackling factor), then it is a "foul"
If a foul gives red or yellow is calculated later.
The number tacking factor is basically the 2 * team's tack setting
The tack setting is a number from 0 (fair) to 4 (extreme)
A 25 to tackle factor is added if the opponent was injured.
5 is added to the tackling factor if it was a sliding tackle. (whether it is a moving or not calculated from the mentality)
But if tackles are set to fair, the opponent was not injured and it was not a sliding tackle, then the random number between 0-99 must be at least 95 before it is a foul. So there is still a 5% risk, even if one tackles tackles fairly.