My grading criteria are different from those simple addition (using Moodle 2.8). They are:
1. If X, award zero. Ignore everything else.
2. If not X
a) If Y, grade everything that is left out of 30/100 (everything after this is in percentages).
b) If not Y, grade everything that is left out of 100/100 (everything after this is in percentages)
3. Everything from here on out is simple additive.
How do I implement this as a marking guide / rubric?