Back in the sixties through the early ninties, when I was a board wargame enthusiast, I played practically every game by myself. First of all, just finding someone to play the more complex games I enjoyed was tough. Also I enjoyed them as an activity rather than a competition, figuring out how the game system worked and how to best play the game.
My wife, when we moved into our first apartment after we got married (29 years ago
), built me a ten foot by thirty inch table so I could leave "Campaign For North Africa" set up continuously for several months (which btw was how long it took to play it
). We had one bedroom to sleep in, the other bedroom became my game room. Probably why we are still married after 29 years