For years, FIFA players have claimed that the games have contained hidden features of 'scripting' and 'momentum' which change the outcome of matches.
That is the idea that your players begin to play differently i.e. fail with more passes or tackles to help your opponent and make matches more dramatic. It can sometimes feel like every game features a last-minute winner or your opponent suddenly plays perfectly to get back into the game.
The FIFA community exploded when 'Dynamic Difficulty Adjustment' was unearthed which stated that the technology would predict how much longer a player would want to play the game and, once it detected undesirable traits such as boredom or frustration, the difficulty of the game could be changed to re-engage that player.