Table: shaun murphy (snooker player)
Question: What is the average margin of victory for Shaun Murphy in championship finals?
Step 1 (Reasoning, Grounding): margin of victory, point difference
Step 2 (Operation, Indexing): score
Step 3 (Reasoning, Arithmetic): -, shaun murphy and opponents' points
Step 4 (Reasoning, Aggregating): AVG, point difference
Answer: -0.875