Once upon a time there was a game called InfoChess, where each player only knew what was going on through an umpire who kept him updated with "sightings" of enemy chess pieces every move. Players also had a limited number of chips to buy info warfare capabilities, everything from "Electronic Attack" (the piece designated to move can't) to "Electronic Protect" (negates your opponent playing "Electronic Attack") to "Reconnaissance" to "Ruse" to "OPSEC" to "PSYOP." Best of all, most capabilities could not be used immediately but two turns after purchase. Meant you had to think ahead when integrating your "information strategy" with your "chess strategy."

But the best way to play was with chess variants, like "Guerrilla Chess," especially when one side wasn't aware. I remember one game I ran as a training exercise for Intelligence officers--white had the standard chess setup, but black was the guerrilla player and had extra pawns instead of rooks and bishops. His goal was to eliminate six white pieces--if he did that, he won. Nobody told white anything, who assumed he was playing regular chess. What was amazing was that he was seeing much of the real situation but refused to believe it, murmuring that black was running quite a deception program that he couldn't slice through. Of course, black won and when white found out that he had been unknowingly been playing "Guerrilla Chess," all he could blurt out was, "Hell, had I known that was his goal and his forces, I would have thrashed him." A lot of counterinsurgents in the real world say the same thing....