It seems to work perfectly to annihilate the UNBALANCED EFFECTS of some scenarios! (The most awful being: Gamonal, Ocana cavalry, Alba de Tormes and San Marcial)
The EASY & FAST way to do it : One player choose THE SCENARIO + THE SIDE + THE CONDITIONS (normal or with less victory flags for his side to win) The other one has 2 choices: HE ACCEPTS and must play it exactly that way! HE REFUSES and must play it exactly that way but on the other side!
Just try the CHALLENGE … all the scenarios are great now!