This is the professional interpretation:
Customs and Usage: First basemen often position one foot in foul territory while holding a runner on first base. On the Major League level, this is acceptable and not considered a violation of the rule. The National Association Leagues' umpires are instructed to permit this unless a complaint is raised. If so, they are told to enforce the rule as written for both teams (similar to the "coach being out of the box" type situation). Defensive players are not allowed to be in foul territory to back-up appeal plays or pitches. No penalty is provided. The umpire simply does not allow play while this condition exists. If a player refuses to comply, he should be ejected.
PLAY:In holding the runner on 1st, the 1st baseman has one foot completely in foul territory.
RULING: In Major League play, this is completely legal. National Association Leagues instruct their umpires to allow this unless a complaint is lodged. In that case, strict compliance with 4.03 is required.
Tim.
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