Never had it before, but here goes.
The illegal pitch is the precedence here, and since it requires a delayed dead ball to see if the runner reaches first safely and all other runners advance, then i would see what happens from there. In the cases you mention, both a and b, the BR would be safe because of the illegal pitch, even though the BR would ordinarily be out in b.
Did you follow me there? The complete breakdown in both scenarios would be R1 scores, R2 to third, and the BR to first because of the illegal pitch. Nothing on the catcher's obstruction or on the interference call.
Now...let's see how I do.
Scott
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