Bob,
I have worked over 3,700 games and have never started or ended a game working as a one man band.
If I arrived at my game and no 2nd umpire arrived I would follow the process of my association and call our assigner. I would inform him of the problem and ask how long it would be until a subs arrived. If there was no sub I would cancel the game.
If my partner was injured during the game I would ask if there was anyone present that could umpire the bases. If there was no one I would suspend the game at that point and let the league decide what to do.
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