On a force third out, no runs may score, even if runner crosses plate before out is made. Because a tag up play is not a force out, any runs crossing the plate before the appeal will count. This is the most important reason for understanding that this is not a force play and why MTR made his post.Yes, I know. I'm just saying that the concept is the same - if the fielder tags the base before the runner gets there then the runner is out. Obviously it's not exactly the same - in one the runner is advancing to a base and in the other she is returning to the base - but it's the same idea.
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