Chess is a really poor analogy, since the 'king' is nothing but a piece of plastic, wood, or stone. The thinking is done by a piece completely outside the game.
The person making the decisions has to be located in a spot where he can see what's going on. In past wars, the general had to be near the front where he could get a good view of all the action with his own eyes, plus have a good cavalry to bring observations of things beyond the general's own eyes. Today, the general relies more on the modern equivalent of the cavalry to bring him a bigger view of the battle - except the modern equivalent requires a communications infrastructure and the means to process the observations.
You see more if your infrastructure isn't destroyed by enemy fire than you do if you stand on a hill to personally view the battle.
I take it you suspect generals use a strategy designed to protect their own life rather than a strategy designed to win? Or you suspect the lack of risk to their own life makes them more willing to sacrifice their troops?