In the beginning of the second or third turn, the active player is in Retreat!, thus the game ends at the end of said turn, is that round still scored? I assume it would as that game round would be considered ended.
Yes, it is. That's why it's not always the best idea to kill off your enemy. There were few games that I won or draw having almost no unit on the battlefield ;) PozdRawiam / Greetings