Pitcher balk ?- throw to 1st

[maven]

After coming set, F1 may legally do just 3 things:

1. Pitch to the batter
2. Legally disengage
3. Step and throw to a base (or feint if allowed)

To disengage legally (step off), his first move must involve the pivot foot. It must move directly backward and behind the rubber. The pivot foot must plant before the hands separate, though if the move is clearly a step off many umpires will allow the hands to separate as the foot is coming down.

Once disengaged, the pitcher is an infielder and may throw or feint to any base as he wishes.