Tomoko Kato is a Japanese professional Go player at Nihon Ki-in. Her mentor is Kazuko Sugiuchi (Sachiko Honda's sister).
| Year | Notes |
|---|---|
| 1991 | Obtained professional status |
| 1992 | Obtained the Women Honinbo title (女流本因坊) and the female MVP (棋道賞女流賞) |
| 1993 | Obtained the Rookie Award (棋道賞新人賞) |
| 1994 | Semi-finalist at the World Women Go Championship (ja:宝海杯世界女子選手権戦 ). Obtained the female MVP |
| 1995 | Defeated Kazuko Sugiuchi and obtained the Women Grand Master title (女流名人). This is the first title match fought by players with apprenticeship (teacher-student relationship). She was also the 1st place in the female player prize money ranking. |
| 2000 | Obtained the Women Champion title (女流最強位) |
| 2001 | Ranked in the top 8 players at the International Women Professional Weiqi Championship (ja:山水黔城杯国際女子プロ囲棋選手権戦) She was promoted to 5 dan in this year. |
| 2005 | Obtained 300 career wins |
| 2013 | Promoted to 6 dan |