Chiba's (then known as Ryōko Usui) first appearance in a women's professional shogi major title match came in 1998 when she challenged Ichiyo Shimizu for the 6th Kurashiki Tōka Cup [ja]; Chiba lost the match 2 games to 1.[3] That same year Chiba also challenged Shimizu for the 25th Women's Meijin title, but once again lost (3 games to 1).[4][5]
In 1999 and 2000, Chiba yet again challenged Shimizu in a major title matches. She lost the 10th and 11th Women's Ōi [ja] title matches respectively by the scores of 3 games to 1 and 3 games to none.[6][7] Later in 2000, Chiba won her first tournament as a women's professional when she defeated Hiroe Nakai 3 games to 1 to win the 5th Kajima Cup [ja].[8] Chiba and Nakai met once again the following year in the finals of the 6th Kajima Cup Tournament, but this time Nakai won 3 games to 1.[9]
In 2002, Chiba challenged Nakai for the 29th Women's Meijin title and was leading the match 2 games to 1 after three games. Chiba was, however, unable to pick up the third win she needed to capture the title, and Nakai came back to win the match 3 games to 2.[10] Chiba once again challenged for the Women's Meijin title in 2004, but lost the 31st Women's Meijin match to Shimizu 3 games to 1.[11]
Chiba finally won her first women's professional shogi major title in June 2005 when she defeated Nakai 3 games to none to win the 27th Women's Ōshō [ja] title.[12][13][14] The following year, Nakai once again challenged Chiba in the 28th Women's Ōshō title match, but this time it was Chiba coming back to win Games 4 and 5 to successfully defend her title 3 games to 2.[15] Chiba defended her Women's Ōshō against Shimizu in 2007 and started well by winning Game 1, but Shimizu won the next three games to capture the 29th Women's Ōshō match 3 games to 1.[16][17]
Chiba has appeared in major title matches nine times and has won a total of two titles.[19] In addition to major titles, Chiba has won one other shogi championship.[20]
Notes: 1. No symbol denotes JSA affiliation 2. An asterisk (*) denotes LPSA affiliation 3. A cross (†) denotes unaffiliated. 4, A two-barred cross (‡) denotes a JSA apprentice school player.
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