| When | User | Flag Type | Description |
|---|---|---|---|
| 2009-08-11 17:49:02 | hikarinogo | Well Constructed | |
| 2012-09-25 16:47:57 | kevinwm | Well Constructed | |
| 2015-11-16 21:20:53 | Aristotle | Well Constructed | |
| 2018-02-17 00:10:56 | Onishi T | Well Constructed | |
| 2018-06-20 11:56:28 | Tesudji_king | Needs Fixing | This variation seems to work, but it is not added. P18 - O18 - Q18. If white R17, black N18. |