Ratings
2019-09-28: 5th Korea Myung-In(Korea)
| OH Joungmok | 41-23 | KWON Younghwa |
| KIM Taeyeon | 19-45 | KWON Younghwa |
| KWON Younghwa | 47-17 | LEE Chunae |
| KWON Younghwa | 37-27 | AHN Taeyoung |
| JANG Hyunwoo | 33-31 | KWON Younghwa |
| KWON Younghwa | 29-35 | SOHR Jaeyoung |
| SON Jinhyeok | 18-46 | KWON Younghwa |
2018-09-01: The 2nd Incheon Open(Korea)
| KWON Younghwa | 24-40 | FUKUNAGA Kohachi |
| KWON Younghwa | 62-02 | KIM Dongsu |
| MOON Sungcheol | 31-33 | KWON Younghwa |
| MIYAZAKI Yuji | 42-22 | KWON Younghwa |
| CHO Wonyong | 13-51 | KWON Younghwa |
| KWON Younghwa | 44-20 | KIM Kwanyoon |
2016-02-21: 25st Korea Othello Championships(Korea)
| KWON Younghwa | 14-50 | HA Seungsup |
| JEON Gunsoo | 12-52 | KWON Younghwa |
| KWON Younghwa | 49-15 | KIM Daeil |
| LEE Chunae | 23-41 | KWON Younghwa |
| KWON Younghwa | 32-32 | IGARASHI Toshiyuki |
2010-02-21: 15th KoA Championships 2010(Korea)
| OH Joungmok | 46-18 | KWON Younghwa |
| KWON Younghwa | 49-15 | FU Velma |
| LEE Kwangwook | 40-24 | KWON Younghwa |
| KWON Younghwa | 45-19 | HA Seungsup |
2008-03-31: 9th Korean Othello Open(Korea)
| KWON Younghwa | lost to | OH Joungmok |
| HA Seungsup | lost to | KWON Younghwa |
| JUNG Taejoon | 32-32 | KWON Younghwa |
| KWON Younghwa | lost to | LEE Kwangwook |
| OH Joungmok | lost to | KWON Younghwa |
| KWON Younghwa | won against | OH Joungmok |
2003-10-30 → 2003-11-01: WOC 2003 (Stockholm)(World)
| KWON Younghwa | 41-23 | SHIFMAN Ilya |
| HOBO Roel | 21-43 | KWON Younghwa |
| KWON Younghwa | 14-50 | KRZYWONOS Tim |
| HUBBARD Geoff | 31-33 | KWON Younghwa |
| SHIFMAN Benyamin | 25-39 | KWON Younghwa |
| KWON Younghwa | 05-59 | WILLIAMS Eddie |
| ANDERSSON Goran | 38-26 | KWON Younghwa |
| KWON Younghwa | 17-47 | BERG Matthias |
| KWON Younghwa | 14-50 | JUNG Taejoon |
| ROGOSZ Magdalena | 36-28 | KWON Younghwa |
| KWON Younghwa | 46-18 | RADZIVILOVSKY Lev |
| BRAUN Holger | 41-23 | KWON Younghwa |
| KWON Younghwa | 36-28 | CORIO Marc |