The majority of the time, a RHP will come off the front of the rubber when making a move to 1B, either with the "jab step" or the "jump turn". Both moves are considered to be made while on the rubber. A RHP can keep his foot completely on the rubber while throwing to 1B, but the move takes too long and there's too much of a possibility of being balked for moving towards home.
Basically, look at the pitcher's pivot foot during his move. If it goes directly back behind the rubber, he's off; otherwise, consider him to be on the rubber.
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