after the first nuclear explosion, two additional non-nuclear bombs were exploded shortly after the main blast in order to imitate a second-wave nuclear strike. nothing now remains of the castle itself apart from its earthworks, although the site is a scheduled ancient monument. players are allowed to trade and negotiate anything at any time except the transfer of bonds. first, for each variable with a lower bound other than 0, a new variable is introduced representing the difference between the variable and bound. 