Originally Posted by
Kaabee
Rule 7.06(a) [Type A Obstruction]
Criteria: Play must be attempted on obstructed runner at the moment obstruction is called.
Criteria 2: All instances of batter-runner obstruction before he reaches first base, regardless of whether or not there is a play being made on him at the instance of obstruction.
Execution: Ball is immediately dead and penalties imposed.
Penalty, All Runners: Umpire's discretion, to bases "they would have reached...if there had been no obstruction."
Penalty, Obstructed Runner: Mandatory minimum of a one-base award (awarded from last base legally touched at the time of obstruction). May be awarded additional bases.
Rule 7.06(b) [Type B Obstruction]
Criteria: No play is being attempted on the obstructed runner at the moment of obstruction.
Execution: Ball is live, play proceeds until no further action is possible. Penalties imposed after play.
Penalty, All Runners: Umpire's discretion, imposition of penalties to "nullify the act of obstruction."
Risk: Because the ball is live throughout Type B Obstruction, an obstructed runner may be declared out if he runs past the base he would have been awarded under Type B's penalty.