How much of a scenario do you ought to know (when you start playing it)?

[KAreil]

Great question.
I was wondering that as well and thinking about creating a thread for it - I'm really looking forward to the responses.

Until now I always played blind but as soon as I played a scenario a second time I had some knowledge about initial positions, especially with mirror games.

By now I think having a look at the starting situation of the opponent is the way to go to "even the playing field".