I wrote a couple of paragraphs about these guys a couple of months ago, but I missed a strip.
You can tell it's the '70s because the Strategic Gamers were occupying a squash court. In the '60s, it would have been a handball court. By the '80s, squash was passé, and all the squash courts had been converted to racquetball courts. Evolution continued, and by the latter half of the '80s, the racquetball courts were now wallyball courts (wallyball was simply volleyball in a confined space, with the walls in play - you could bounce the volleyball off one wall, but not off two). These days, enclosed spaces are given over to Nintendo Wii and look very much like your living room.