10th inning and a man mysteriously appears on 2nd base.
That's not a rule change, that's an entirely different game.
This is the first I’ve heard of it. That’s really stupid.
The rule doesn’t apply in postseason.
This is an international play rule similar to 3-on-3 hockey for overtime.
In Asia, once you put the man on second you have two (Korea) or three (Japan, Taiwan) innings to play. Once you play 11 or 12 innings, that’s a tie game, and it doesn’t count towards the standings, so ties help in a way. A team that goes 1-0-134 in a 135 game season in Japan has a 1.000 percentage. In Japan, the rule is runners on first and second in the 13th inning of Game 8 of the championship series.
Even the high school tournament (Koshien) now puts runners at first and second in the 10th inning of the elimination tournament. The object now is to play small ball in order to win the game, not slug it out. Put a few shallow fly outs, get a K, and you can bunt and sac-fly to win the game.
Tiebreakers are used in international baseball and softball.