Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the winning score where the runner-up is Robert-Jan Derksen and the margin of victory is 1 stroke?

### Inputs:
table_name: table, columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner(s)-up']

### Response:
SELECT Winning score FROM table WHERE Margin of victory = 1 stroke AND Runner(s)-up = robert-jan derksen