Obstruction can be a tricky call, and without having seen all the circumstances of a play, it's hard to say "That is obstruction" over an internet message board. With that caveat, though...
Basically, if a fielder impedes a runner's progress and is not making a play, yes, it is obstruction.
I just finished a 16U/14U tournament this weekend. I had a coach come onto the field to discuss a call and he left mumbling about "all these 14 year old kids they're letting umpire who don't have any experience... they just don't understand." Well, I'm may be younger but I'm not 14, I do understand, and I actually had more experience than either of my older partners. In umpiring, youth is a killer. I'm just saying, you shouldn't take a younger looking umpire and assume you won't get a good game. This isn't always the case.
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Sara
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