Type B obstruction - leave the ball live until ALL playing action ceases, then award bases, if necessary, to nullify the obstruction.
In this play, obstruction had nothing to do with the B/R - he advances at his own peril and thus, his out at second stands. As for R1, if he was thrown out at third on a relatively close play, award him third base since the obstruction probably caused him to be thrown out.
Don't forget, Type A obstruction is atleast a one base award, however in Type B obstruction, the award is based on umpire's judgement as to where the runner would have ended up if the obstruction did not occur.
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