Palace are a well organised team with some good players. Their keeper also had his game of the season (which helps).
This is Diego Torres' description of Mourinho's philosophy:
1. The game is won by the team who commit fewer errors.
2. Football favours whoever provokes more errors in the opposition.
3. Away from home, instead of trying to be superior to the opposition, it’s better to encourage their mistakes.
4. Whoever has the ball is more likely to make a mistake.
5. Whoever renounces possession reduces the possibility of making a mistake.
6. Whoever has the ball has fear.
7. Whoever does not have it is thereby stronger.