Red Sox/Yankees-checked swing.

[copeaus]

Here are two things I look for to determine if a batter swung on a checked swing:

1) how far did the bat come out/around
2) location of the batter's hands (close to body, away from body)

The position of the hands in my opinion is crucial. A batter can swing/torque his upper body all the way around and the bat may technically have crossed home plate, however, if his hands are in close to his body then the bat though "swung around" will have remained at or near his shoulder area. In my opinion this is not "offering at the pitch".