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

### Instruction:
On what date was the tournament played that eneded with a winning score of +6 (74-71-70-71=286) and margin of victory of 2 strokes, and with Arnold palmer as the runner-up?

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

### Response:
SELECT Date FROM table WHERE Runner(s)-up = arnold palmer AND Margin of victory = 2 strokes AND Winning score = +6 (74-71-70-71=286)