I was just playing a game in Beta 3B as the Yor (Large map, all other races, average difficulty, disabled tech trading) when the following happened :
The Drengin decalred war on the Iconians, who surrendered next turn, then the Korath declared war on the Arcean, who surrendered next turn. Both only lost a single small (size 6) world, were equally large and had strong militaries.
Two turns later the Krynn surrendered to the Drengin, again after losing one planet.