Players › Yusei Koga

Yusei Koga

Player No.	326
Rank	6-dan
Date of birth	Jan 1, 2001
Birthplace	Fukuoka
Teacher	Isao Nakata 8-dan

Junisen terms5

Career record32W-14L

Win rate0.696

Deviation score (FY2026)52.8

Best deviation score61.5
FY2025

Rating history and all games →

Junisen record

Term	Class	Rank	Record	Up/down	Deviation
85th term	Class B2	7	2W-4L		52.8
84th term	Class B2	8	6W-4L		61.5
83rd term	Class B2	23	6W-4L		59.3
82nd term	Class C1	26	9W-1L	Promoted	56.1
81st term	Class C2	52	9W-1L	Promoted	59.1

How the deviation score is calculated: see here.

Terms in each class

Class B2	3 terms
Class C1	1 terms
Class C2	1 terms

Promotion history

Mar 5, 2024	6-dan
Mar 14, 2023	5-dan
Oct 1, 2020	4-dan
Oct 2017	3-dan

Career win milestones

100 wins	Nov 13, 2024 Junisen

Best wins (highest-rated opponents)

Apr 14, 2026	Takumi Ito 1979	Oi-sen
Aug 29, 2023	Takumi Ito 1913	Junisen
Jan 22, 2026	Shinichiro Hattori 1910	Eio-sen
Feb 13, 2026	Shinichiro Hattori 1908	Oi-sen
Dec 26, 2025	Nagisa Fujimoto 1863	Eio-sen

Career wins and ratings are counted from the games recorded on this site (official games from FY1964, and Junisen games before that) and may differ from official records.

Frequent opponents

Seiya Tomita	6W-2L	Head-to-head
Mikio Kariyama	4W-4L	Head-to-head
Takashi Ikenaga	3W-4L	Head-to-head
Shinichiro Hattori	2W-5L	Head-to-head
Akihiro Takada	4W-3L	Head-to-head
Yasuaki Murayama	5W-1L	Head-to-head
Kenji Imaizumi	5W-1L	Head-to-head
Shinya Yamamoto	5W-0L	Head-to-head
Ryuuma Tonari	1W-4L	Head-to-head
Takuya Nishida	1W-4L	Head-to-head
Takumi Ito	2W-3L	Head-to-head
Akihiro Ida	4W-1L	Head-to-head

Head-to-head with other players →