"In the case of CAV-vs-CAV combat, I think you guys are excessively worried. The stakes just aren't that high. If an attacker loses decisively, the worst that will happen to him is that he loses 1 DISR - exactly the same as the defender, and exactly what he would have lost in any outcome."
Before I give a response on behalf of the excessively worried, I will stress I have no view if this is a game problem or not. I just like thinking about these sorts of things.
While the impact on the attacker is not really affected, it makes a big difference to the odds of the defender being destroyed.
Take a cav unit in line that charges a cav unit in column (covering at more than half its bases). All things else equal this is 10 v 8 dice. I think this gives a 33% chance that the defender will be destroyed. Otherwise one side bounces and both end up with a DISR.
If the defender is able to form line, but stays in front of the attacker it becomes 8 dice v 8 dice. This reduces the chance of the defender being destroyed to 25%. Otherwise one side bounces and both end up with a DISR.
If the defender can form line in such a way that half or less of their bases remain in front of the attacker, it becomes 4 v 8 dice. The chance of the defender breaking is now 10%. Otherwise one side bounces and both end up with a DISR.
So a formation change that gets out of the path of the charge drops the odds of being destroyed by 2/3rds.
If a unit in line is charged by another unit in line (8 v 8 dice) there is a 25% chance that the defender breaks. But if the defender can change into column and not have more than half its bases in front of the enemy it becomes 6 v 8 dice. This gives about a 17% chance of the defender being destroyed.
Note there is no penalty for cavalry trying to change formation and failing - so it is a good/same outcome for the defender.
Now this may be totally intended and a good reflection of the swirling nature of combat in open spaces. But it is not immediately intuitive. Would newbie players think that when charged, a formation change (sometimes even from line to column) is the best response, or will it be a shock when it is done to them the first time?
Cam