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Koyama Ryugo

Koyama Ryugo (小山竜吾) has a rating of 1323, ranked 393 of 452 in professional play. Their highest rating so far is 1493 (June 2, 2012).

Koyama Ryugo7 dan小山竜吾Nihon Ki-in Tokyo
Rating1323
Rank393
1-year change↓15
Peak rating1493
Last 10116-191
2026 record
1-7
Record since 1927
116-191
Win rate
.378

The rating is calculated from published game results. It does not include any adjustment for playing Black.

Professional ratingsFind a player

Rating history — professional

9 gamesHigh 1355Low 1323
37 gamesHigh 1401Low 1323
60 gamesHigh 1416Low 1323
225 gamesHigh 1493Low 1323

The “All” view starts at 2006; earlier years are used only to warm up the calculation and are not shown.

Recent games

Up to 20 games, newest first. “Change” is the rating movement.
DateOpponent and tournamentResultChange
May 21, 2026Kudo NorioOza　Colors unknown↓13
April 23, 2026Toyoda HirohitoTengen　Colors unknown↓4
April 2, 2026Sakai MakiHoninbo　Colors unknown↓8
March 26, 2026Sonoda YasutakaMeijin　Colors unknown↓7
March 9, 2026Nagashima KozueTengen　Colors unknown↑16
March 2, 2026Kazama JunGosei　Colors unknown↓4
February 23, 2026Saga ShuntaroJudan　Colors unknown↓8
January 15, 2026Numadate SakiyaKisei First Tournament Preliminary Round 1　Colors unknown↓2
December 11, 2025Shimoji GenshoMeijin　Colors unknown↑16
August 7, 2025Yanagihara SakiOza　Colors unknown↓6
July 24, 2025Nagashima KozueOza　Colors unknown↑18
July 21, 2025Kato KeikoRyusei　Colors unknown↓14
June 5, 2025Takemiya YokoTengen　Colors unknown↓8
May 15, 2025Awaji ShuzoGosei　Colors unknown↓4
April 14, 2025Koda AkikoHoninbo　Colors unknown↓25
April 10, 2025Yoshihara YukariGosei　Colors unknown↑19
March 6, 2025So KofukuJudan　Colors unknown↓8
February 17, 2025Kanno MasashiAgon Kiriyama Cup　Colors unknown↓19
February 13, 2025Sotoyanagi SebunMeijin　Colors unknown↓3
January 23, 2025Akiyama JiroKisei First Tournament Preliminary Round 2　Colors unknown↓2

Head-to-head

Up to 10 opponents, most-played first. Records are from Koyama Ryugo's point of view; jigo and no-result games are not counted as wins or losses. Only games from 1927 onward are included.
OpponentTotalAs BlackAs White
Shimoji Gensho3-2.6000-00-0
Tajiri Yuto2-3.4000-00-0
So Kofuku2-2.5000-00-0
Nagashima Kozue3-1.7500-00-0
Suzuki Isao2-2.5000-00-0
Tei Meiko3-1.7500-00-0
Kubo Hideo1-3.2500-00-0
Takao Shinji1-3.2500-21-1
Otake Hideo0-4.0000-20-1
Tamaki Shinobu4-01.0000-00-0

Record by year

Counted by calendar year, January to December (default wins and losses are included; jigo and no-result games are not). Only games from 1927 onward are counted, so these totals do not match the career records published by the two Ki-in.

YearRecordWin rate
20261-7.125
20253-9.250
20246-8.429
20233-9.250
20222-8.200
20215-12.294
20205-8.385
20196-10.375
20189-11.450
20178-11.421
20166-8.429
20155-10.333
20141-5.167
20133-6.333
201211-6.647
20113-8.273
20100-1.000
20091-2.333
20064-4.500
20057-10.412
20049-8.529
20036-11.353
20023-9.250
20001-1.500
19991-1.500
19970-1.000
19950-1.000
19940-1.000
19931-01.000
19923-2.600
19911-1.500
19892-2.500
Total116-191.378

Calculated from games played between 1927 and 2026 (as of September 17, 2026).