http://one.xthost.info/Dinonykos/Com...sed3Rounds.pdf
This is a link to my suggestion for a 3-rounds-event-based combat. I have not yet tested it completely, anyway, it might be inspirative for everybody who wants to do something similar...
My first approach to an event-based combat is much more complicated (however, works very good), but has the adventage that it can also be used for step events, while the approach posted above only works on a specific square.