One example that I've gleaned from this website accounts a Japanese war game for the Battle of Midway:
In the tabletop manoeuvres, for example, a situation developed in which the Nagumo Force underwent a bombing attack by enemy land-based aircraft while its own planes were off attacking Midway. In accordance with the rules, Lieutenant Commander Okumiya, Carrier Division 4 staff officer who was acting as an umpire, cast dice to determine the bombing results and ruled that there had been nine enemy hits on the Japanese carriers...
I would like to know how such war games were played in this era. Did they alternate turns or take both turns simultaneously? How were the odds calculated, e.g., that a carrier strike would succeed? Did they keep track of things like remaining fuel and munitions? Was weather simulated?
I'm interested in land, sea, and air battles, and from all of the major belligerents (not just Japan). But I could not find mentionings of other war games or military exercises played by, e.g., Patton, Manstein, Zhukov, Dowding, etc. Sadly it's nigh impossible to google, as every keyword seems to be interpreted as if I wanted a modern computer "war game" like Hearts of Iron 4 or something. That's not what I want. I want to know the rules of a real war game played before and during WW2, that real generals played. What were the rules of those games?