Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. | Date | Tournament | Winning score | To par | Margin of victory | Runner(s)-up |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | 20 Sep 2009 | Samsung World Championship | 71-67-63-71=272 | –16 | 1 stroke | Ai Miyazato |
| 2.0 | 1 Nov 2009 | Hana Bank-KOLON Championship | 68-71-67=206 | –10 | 1 stroke | Yani Tseng Maria Hjorth |
| 3.0 | 4 Jul 2010 | Jamie Farr Owens Corning Classic | 64-67-68-71=270 | –14 | Playoff | In-Kyung Kim Christina Kim Song-Hee Kim |
| 4.0 | 31 Oct 2010 | LPGA Hana Bank Championship | 69-68-69=206 | –10 | 2 strokes | Vicky Hurst |
| 5.0 | 16 Oct 2011 | Sime Darby LPGA Malaysia | 66-68-67-68=269 | –15 | 1 stroke | Yani Tseng |
| 6.0 | 8 Jul 2012 | U.S. Women's Open | 71-72-65-73=281 | –7 | 4 strokes | Amy Yang |
Question:
Who was the runner up when the won by 4 strokes?
Answer:
Amy Yang