Not really back yard cricket but we had epic tournaments when I was growing up. We would haul a hockey net behind a cricket pitch and have one on one tournaments. Any shot behind square on the full was out. 5 overs to slog as many runs as you could. It would take about 45 minutes to bowl the 5 overs because there were no fielders and you had to walk to the boundary to pick up the ball.
You would pick a country to represent. And each bowler who bowled had to have a different bowling action that you would invent.
Auckland 47,103, 27, 269*, 59, 118