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In a 6-4-3 double play who gets credit?
In an instance of a line drive out then throw behind a runner to get a force who gets credit? Is it a DP or line out and force?

everyone involved gets credit for assist or putout depending on their involvement in the play. Your example is a double Play.

Make sure you use the double play button when selecting how the runner was put out (as opposed to forced out).

Also, for traditional double plays, using the quick outs is easiest.