The game system was based on SPI's old division-level World War II gaming system used in various games (such as their game on the battle of Kursk or "Destruction of Army Group Center", based on events of the summer of 1944) over the preceding five years or so. Much emphasis is placed on exploitation by armoured units, which, as usual, may move a second time after as well as before combat, and may conduct overruns – attacks in the course of movement – during either of their movement phases.