Each major power has a pool of Basic Resource Points (BRPs - sometimes pronounced "burps"), to represent economic power, and used to build units, declare war (35 BRPs to declare war on a major power, 10 to declare war on a minor power), or offensives (15 BRPs). The side with more BRPs moves first, so by economising the previous season, a player may gain a "flip-flop" and make two consecutive moves, possibly allowing a devastating offensive. A Double Turn across winter 1939/40 is common: Germany moves first in Fall 1939, reduces her BRP total by building lots of units, so moves second in Winter, then first again in Spring 1940 as her BRP level refreshes, allowing a spectacular German offensive in the West. Italy's BRPs are included with Germany's even when still neutral, but US and Soviet BRPs are not included until they join the Allies, requiring careful play around the initiative change in the mid-war.