[Tim C]

I apologize: I "misremembered" Bob's answer!

"Ruling for Situation 1). R1 is out and B4 is out for interference. Two out. Since there was a preceding play, the placement of the runners is critical. All runners will return to the base occupied at the time of the catchers throw. If B2 and B3 have advanced to the next base safely prior to the catcher's throw they will be placed at second and third bases. If they have not advanced to the next base they will be returned to first and second base, those bases last legally occupied at the time of the throw. Rules 8-4-1g and 5-1-1e.

"Ruling for Situation 2). B4 is out for interference. Runners are returned to the base legally occupied at time of the infraction. Rules 8-4-2g and 5-1-1e. Count the run.

"Ruling for situation 3). R1 is out, B4 is out for interference. No triple play. The ball is dead immediately when B4 interferes with the catchers throw. Place R2 and R1 as you would in situation 1. Rules 8-4-1g and 5-1-1e."