Catcher's Obstruction with Malicious Contact - Did we get it right?

[PeteBooth]

The FIRST thing you do is enforce the CO penalty which means all runners move up a base. Therefore, ALL runners would originally advance on the CO penalty.

Now you have MC on a DIFFERENT runner so you enforce the MC penalty against that runner meaning R1.

You enforce the penalties in the order they occurred unless the SAME runner was called for MC which would SUPERCEDE the original call but that is not the case in the OP.

Pete Booth