Rating › Naoki Koyama

Rating of Naoki Koyama

Player page　Last game 2026-10-29

Current rating1583

Peak1648
2025-11-06

Games136

By fiscal year

FY	Age	Annual rank	Rank	Junisen	Ryuo-sen	Rating	Deviation	Change	W	L	Win rate
FY2026	age 27	100th	4-dan	Class C2	Group 6	1583		-47	7	12	0.368
FY2025	age 26	81st	4-dan	Class C2	Group 6	1630	50.0	+15	23	18	0.561
FY2024	age 25	85th	4-dan	Class C2	Group 6	1614	46.6	-16	18	18	0.500
FY2023	age 24	81st	4-dan	Class C2	Group 6	1631	50.7	+46	21	15	0.583
FY2022	age 23	103rd	3-dan			1584		+0	2	1	0.667
FY2019	age 20	101st	3-dan			1584		-12	0	1	0.000

Games by fiscal year

FY2026 results7W-12L

Win rate0.368

Rating1583

Annual rank100th

Rank/title at FY end / age4-dan / age 27

No	Date	Before	Change	After	Opponent (before game)	Tournaments	Side	Result
1	4/16	1620	-8	1612	Hisashi Namekata9-dan / age 52 1627	Kio-sen Prelims Round 3	Gote	●
2	6/2	1612	+10	1622	Satoshi Takano6-dan / age 32 1723	Kisei-sen Prelim 1 Round 1	Sente	○
3	6/2	1612	+10	1622	Kei Honda6-dan / age 28 1718	Kisei-sen Prelim 1 Round 2	Gote	○
4	6/11	1633	-9	1623	Kazuhiro Nishikawa6-dan / age 40 1570	Junisen Class C2 Round 1	Sente	●
5	6/26	1623	-5	1618	Hirotoshi Ueno6-dan / age 23 1779	Shinjin-o-sen Main Round 3	Gote	●
6	7/1	1618	+9	1628	Koichi Fukaura9-dan / age 54 1671	Asahi Cup Prelim 1 Round 2	Sente	○
7	7/8	1628	+7	1635	磯谷祐維 1578	Kakogawa Seiryu-sen Main Round 2	Gote	○
8	7/16	1635	-6	1628	Kei Honda6-dan / age 29 1718	Junisen Class C2 Round 2	Gote	●
9	7/30	1628	+4	1632	Michio Takahashi9-dan / age 66 1428	Junisen Class C2 Round 3	Sente	○
10	8/13	1632	-8	1625	Taiki Yamakawa4-dan / age 28 1646	Ryuo-sen Group 6 Promotion playoff Round 4	Sente	●
11	8/21	1625	+4	1629	Shinichi Satoh6-dan / age 44 1447	Kisei-sen Prelim 1 Round 3	Sente	○
12	8/21	1625	+10	1634	Ryuma Yoshiike4-dan / age 21 1705	Kisei-sen Prelim 1 Final	Gote	○
13	8/27	1639	-11	1628	Ryosuke Nakamura6-dan / age 40 1500	Junisen Class C2 Round 4	Sente	●
14	9/2	1628	-9	1619	Rintarou Iwamura4-dan / age 20 1583	Oza-sen Prelim 1 Round 2	Gote	●
15	9/10	1619	-8	1610	Shuji Muranaka7-dan / age 45 1605	Asahi Cup Prelim 1 Round 3	Gote	●
16	9/14	1610	-7	1603	Hirotaka Kajiura7-dan / age 31 1658	Oi-sen Prelims Round 1	Sente	●
17	9/24	1603	-9	1595	Shogo Orita5-dan / age 36 1579	Junisen Class C2 Round 5	Gote	●
18	10/8	1595	-7	1587	Reo Koyama4-dan / age 33 1623	Eio-sen 4-dan section Round 2	Gote	●
19	10/29	1587	-4	1583	Mikio Kariyama5-dan / age 24 1756	Junisen Class C2 Round 6	Gote	●

FY2025 results23W-18L

Win rate0.561

Rating1630

Annual rank81st

Rank/title at FY end / age4-dan / age 26

No	Date	Before	Change	After	Opponent (before game)	Tournaments	Side	Result
1	4/16	1610	+7	1617	Yujirou Takahashi4-dan / age 25 1587	Ryuo-sen Group 6 Ranking Round 5	Sente	○
2	5/1	1617	+11	1628	Kazuki Kimura9-dan / age 51 1733	Kio-sen Prelims Round 3	Gote	○
3	5/8	1628	-9	1619	Yuta Komori5-dan / age 29 1606	Ryuo-sen Group 6 Ranking Semifinal	Gote	●
4	5/20	1619	+8	1627	Eiji Iijima8-dan / age 45 1606	Kio-sen Prelims Round 4	Sente	○
5	5/27	1627	+7	1634	Taiki Yamakawa4-dan / age 26 1587	Kio-sen Prelims Final	Sente	○
6	6/10	1634	-9	1625	Kenjirou Abe7-dan / age 36 1588	Kisei-sen Prelim 1 Round 2	Gote	●
7	6/10	1634	+6	1640	西山朋佳 1558	Kisei-sen Prelim 1 Round 1	Sente	○
8	6/19	1631	+5	1636	Satoru Sakaguchi6-dan / age 46 1500	Junisen Class C2 Round 1	Sente	○
9	6/25	1636	-10	1626	Yujirou Takahashi4-dan / age 25 1557	Kakogawa Seiryu-sen Main Round 2	Gote	●
10	6/29	1626	+3	1629	渡辺誠アマ 1372	Asahi Cup Prelim 1 Round 1	Sente	○
11	7/10	1629	-4	1626	Daichi Sasaki7-dan / age 30 1847	Junisen Class C2 Round 2	Gote	●
12	7/14	1626	-4	1622	Tetsuro Itodani8-dan / age 36 1802	Kio-sen Main Round 2	Sente	●
13	7/31	1622	-11	1611	Kota Kanai6-dan / age 39 1509	Junisen Class C2 Round 3	Sente	●
14	8/4	1611	+6	1617	Shoji Segawa6-dan / age 55 1511	Asahi Cup Prelim 1 Round 2	Gote	○
15	8/12	1617	+6	1623	Kiyokazu Katsumata7-dan / age 56 1514	Oi-sen Prelims Round 1	Sente	○
16	8/21	1623	+7	1629	Shingo Itoh6-dan / age 43 1572	Junisen Class C2 Round 4	Gote	○
17	8/28	1629	+9	1638	Hisashi Namekata9-dan / age 51 1675	Oi-sen Prelims Round 2	Gote	○
18	9/4	1638	+5	1643	Yuichi Tanaka6-dan / age 40 1497	Asahi Cup Prelim 1 Round 3	Sente	○
19	9/4	1638	+6	1645	Shingo Itoh6-dan / age 43 1560	Asahi Cup Prelim 1 Final	Sente	○
20	9/11	1650	-7	1643	Hiroyuki Miura9-dan / age 51 1710	Ginga-sen Prelims Final	Gote	●
21	10/6	1643	-8	1635	Daisuke Suzuki9-dan / age 51 1651	Oi-sen Prelims Round 3	Sente	●
22	10/16	1635	+5	1640	Yuichi Tanaka6-dan / age 40 1494	Junisen Class C2 Round 5	Gote	○
23	10/24	1640	-6	1634	Ryuma Yoshiike4-dan / age 20 1726	Eio-sen 4-dan section Round 1	Sente	●
24	10/29	1634	+7	1641	Hirotaka Nozuki8-dan / age 52 1573	Oza-sen Prelim 1 Round 2	Sente	○
25	11/6	1641	+7	1648	Toshiki Sumisaki4-dan / age 17 1606	Junisen Class C2 Round 6	Gote	○
26	11/14	1648	-7	1641	Kanta Masegi4-dan / age 27 1698	Ryuo-sen Group 6 Promotion playoff Final	Gote	●
27	11/18	1641	-5	1636	Hirotoshi Ueno5-dan / age 22 1762	Ryuo-sen Group 6 Promotion playoff2 Final	Gote	●
28	11/28	1636	-8	1628	Taiki Yamakawa4-dan / age 27 1640	Asahi Cup Prelim 2 Round 1	Gote	●
29	12/11	1628	-6	1622	Hirotaka Kajiura7-dan / age 30 1737	Junisen Class C2 Round 7	Gote	●
30	12/16	1622	-12	1610	Michio Takahashi9-dan / age 65 1445	Oza-sen Prelim 1 Round 3	Sente	●
31	12/26	1610	+5	1615	Wataru Kamimura5-dan / age 39 1460	Ryuo-sen Group 6 Ranking Round 2	Gote	○
32	1/8	1615	-6	1610	Akihiro Ida5-dan / age 29 1724	Junisen Class C2 Round 8	Sente	●
33	2/5	1610	+6	1616	Mitsunori Makino6-dan / age 37 1522	Junisen Class C2 Round 9	Sente	○
34	2/12	1616	-9	1606	Hiromu Watanabe6-dan / age 37 1559	NHK Cup Prelims Round 1	Sente	●
35	2/25	1606	+11	1618	Ryuma Yoshiike4-dan / age 21 1754	Ryuo-sen Group 6 Ranking Round 3	Sente	○
36	3/5	1618	+6	1624	Kota Kanai6-dan / age 39 1531	Kio-sen Prelims Round 2	Gote	○
37	3/10	1624	+7	1630	Ehoto Osogaguchi4-dan / age 26 1575	Junisen Class C2 Round 10	Gote	○
38	3/18	1630	-5	1625	Reo Okabe6-dan / age 26 1749	Ryuo-sen Group 6 Ranking Round 4	Sente	●
39	3/23	1625	+10	1635	Tatsuya Sanmaido7-dan / age 32 1726	Osho-sen Prelim 1 Round 1	Sente	○
40	3/23	1625	-12	1613	Yoshiyuki Kubota7-dan / age 53 1420	Osho-sen Prelim 1 Round 2	Gote	●
41	3/27	1623	+7	1630	内山あや 1565	Shinjin-o-sen Main Round 2	Sente	○

FY2024 results18W-18L

Win rate0.500

Rating1614

Annual rank85th

Rank/title at FY end / age4-dan / age 25

No	Date	Before	Change	After	Opponent (before game)	Tournaments	Side	Result
1	4/18	1629	+9	1638	Hisashi Namekata9-dan / age 50 1659	Kio-sen Prelims Round 3	Gote	○
2	5/10	1638	+5	1643	Akira Shima9-dan / age 61 1507	Kio-sen Prelims Round 4	Gote	○
3	5/17	1643	-4	1639	Wataru Yashiro7-dan / age 30 1826	Kisei-sen Prelim 1 Round 1	Gote	●
4	5/29	1639	-5	1634	Taichi Takami7-dan / age 30 1783	Kio-sen Prelims Final	Sente	●
5	6/5	1634	+3	1637	Hiroshi Kamiya8-dan / age 63 1346	Ryuo-sen Group 6 Promotion playoff Round 2	Sente	○
6	6/13	1637	+11	1647	Satoshi Takano6-dan / age 30 1757	Junisen Class C2 Round 1	Sente	○
7	6/27	1647	-10	1638	Yuto Kawamura3-dan / age 25 1578	Shinjin-o-sen Main Round 3	Gote	●
8	6/30	1638	+3	1640	金内辰明アマ 1351	Asahi Cup Prelim 1 Round 1	Sente	○
9	7/4	1640	-13	1628	Eisaku Tomioka9-dan / age 60 1416	Ryuo-sen Group 6 Promotion playoff Round 3	Sente	●
10	7/12	1628	-9	1619	Jodai Furui3-dan / age 19 1596	Kakogawa Seiryu-sen Main Round 3	Gote	●
11	7/18	1619	-8	1610	Shinya Satoh7-dan / age 46 1598	Junisen Class C2 Round 2	Gote	●
12	7/26	1610	+8	1618	Shinya Satoh7-dan / age 46 1607	Asahi Cup Prelim 1 Round 2	Gote	○
13	8/1	1618	+5	1623	Yuya Nagaoka6-dan / age 38 1472	Junisen Class C2 Round 3	Sente	○
14	8/15	1623	-7	1616	Takuma Oikawa7-dan / age 37 1673	Ginga-sen Prelims Final	Sente	●
15	8/21	1616	+5	1622	Kosuke Tamura7-dan / age 48 1497	Oi-sen Prelims Round 1	Sente	○
16	9/5	1622	-9	1613	Yujirou Takahashi4-dan / age 25 1580	Junisen Class C2 Round 4	Gote	●
17	9/11	1613	-5	1607	Satoshi Takano6-dan / age 30 1737	Asahi Cup Prelim 1 Round 3	Gote	●
18	9/27	1607	+7	1614	Taiki Yamakawa4-dan / age 26 1564	Eio-sen 4-dan section Round 1	Sente	○
19	9/27	1607	-5	1603	Reo Okabe4-dan / age 25 1756	Eio-sen 4-dan section Round 2	Sente	●
20	10/2	1610	+8	1618	Akira Nishio7-dan / age 45 1614	Oi-sen Prelims Round 2	Sente	○
21	10/17	1618	-8	1610	Shuji Muranaka7-dan / age 43 1617	Junisen Class C2 Round 5	Gote	●
22	10/31	1610	-3	1607	Amahiko Satoh9-dan / age 36 1859	Oi-sen Prelims Round 3	Sente	●
23	11/7	1607	-11	1596	Kosuke Tamura7-dan / age 48 1477	Junisen Class C2 Round 6	Sente	●
24	11/19	1596	-12	1583	Tadao Kitajima7-dan / age 58 1379	Oza-sen Prelim 1 Round 2	Gote	●
25	12/5	1583	-7	1577	Kouru Abe7-dan / age 30 1638	Junisen Class C2 Round 7	Sente	●
26	1/9	1577	+13	1590	Wataru Yashiro7-dan / age 30 1859	Junisen Class C2 Round 8	Gote	○
27	1/24	1590	+8	1598	Kenta Miyajima4-dan / age 25 1602	Ryuo-sen Group 6 Ranking Round 2	Sente	○
28	1/29	1598	+6	1605	Ryosuke Nakamura6-dan / age 39 1532	Osho-sen Prelim 1 Round 1	Gote	○
29	2/6	1605	+6	1611	小林裕士8-dan / age 48 1537	Junisen Class C2 Round 9	Gote	○
30	2/12	1611	+5	1616	Kiyokazu Katsumata7-dan / age 55 1465	Ryuo-sen Group 6 Ranking Round 3	Gote	○
31	2/18	1616	-7	1609	Ryuma Yoshiike4-dan / age 20 1651	Shinjin-o-sen Main Round 2	Sente	●
32	2/21	1609	-5	1603	Kazuki Kimura9-dan / age 51 1725	NHK Cup Prelims Round 1	Sente	●
33	2/25	1603	-5	1599	Chikara Akutsu8-dan / age 42 1747	Osho-sen Prelim 1 Round 2	Sente	●
34	3/4	1599	+4	1603	Takahiro Toyokawa7-dan / age 58 1424	Kio-sen Prelims Round 2	Gote	○
35	3/11	1603	+7	1610	Yuya Saito4-dan / age 27 1558	Junisen Class C2 Round 10	Gote	○
36	3/17	1610	+5	1614	Yasuaki Tsukada9-dan / age 60 1454	Ryuo-sen Group 6 Ranking Round 4	Sente	○

FY2023 results21W-15L

Win rate0.583

Rating1631

Annual rank81st

Rank/title at FY end / age4-dan / age 24

No	Date	Before	Change	After	Opponent (before game)	Tournaments	Side	Result
1	5/18	1578	-3	1575	Asuto Saito5-dan / age 24 1860	Shinjin-o-sen Main Round 3	Sente	●
2	5/30	1575	-11	1564	Hideyuki Takano6-dan / age 50 1434	Kisei-sen Prelim 1 Round 1	Sente	●
3	6/13	1564	-7	1557	Ryuma Yoshiike3-dan / age 18 1600	Kakogawa Seiryu-sen Main Round 2	Sente	●
4	6/22	1557	-6	1551	Kazuhiro Nishikawa6-dan / age 37 1625	Junisen Class C2 Round 1	Gote	●
5	6/24	1551	-11	1540	中川慧梧アマ 1406	Asahi Cup Prelim 1 Round 1	Sente	●
6	6/30	1540	-7	1533	Reo Okabe4-dan / age 24 1593	Eio-sen 4-dan section Round 1	Gote	●
7	7/13	1533	-4	1529	Hirotaka Kajiura7-dan / age 28 1743	Junisen Class C2 Round 2	Sente	●
8	7/20	1529	+10	1539	Hiromu Watanabe6-dan / age 34 1617	Oi-sen Prelims Round 1	Sente	○
9	8/3	1539	+14	1553	Daichi Sasaki7-dan / age 28 1876	Junisen Class C2 Round 3	Sente	○
10	8/17	1553	-4	1549	Masataka Goda9-dan / age 52 1717	Oi-sen Prelims Round 2	Gote	●
11	9/6	1549	+5	1553	Takehiro Ohira6-dan / age 46 1403	Ginga-sen Prelims	Sente	○
12	9/6	1549	+9	1558	Daisuke Katagami7-dan / age 42 1613	Ginga-sen Prelims	Gote	○
13	9/8	1563	-11	1552	Hideyuki Takano6-dan / age 51 1435	Junisen Class C2 Round 4	Gote	●
14	10/12	1552	+8	1560	Shinya Satoh7-dan / age 46 1571	Oza-sen Prelim 1 Round 1	Sente	○
15	10/26	1560	-5	1556	Takashi Ikenaga5-dan / age 30 1700	Junisen Class C2 Round 6	Gote	●
16	11/9	1556	+11	1566	Akihiro Ida4-dan / age 26 1670	Junisen Class C2 Round 7	Sente	○
17	11/15	1566	+6	1572	Yuji Masuda6-dan / age 52 1458	Ginga-sen Block G Round 1	Sente	○
18	11/27	1572	+6	1578	Michio Takahashi9-dan / age 63 1499	Oza-sen Prelim 1 Round 2	Sente	○
19	12/7	1578	+11	1589	Kazuo Sugimoto5-dan / age 32 1697	Junisen Class C2 Round 8	Sente	○
20	12/13	1589	+5	1594	Takanori Anyouji7-dan / age 49 1474	Ginga-sen Block G Round 2	Gote	○
21	12/25	1594	+10	1604	Junpei Ide5-dan / age 32 1660	Oza-sen Prelim 1 Round 3	Gote	○
22	1/10	1604	+4	1608	伊藤沙恵 1437	Ryuo-sen Group 6 Ranking Round 1	Gote	○
23	1/16	1608	-8	1601	Yusuke Toyama6-dan / age 44 1628	Ginga-sen Block G Round 3	Sente	●
24	1/18	1601	+8	1609	Shuji Satoh8-dan / age 56 1616	Junisen Class C2 Round 9	Sente	○
25	1/23	1609	+4	1613	Hisashi Ogura8-dan / age 55 1438	Osho-sen Prelim 1 Round 1	Gote	○
26	1/26	1613	+4	1618	Masakazu Kondoh7-dan / age 52 1439	Ryuo-sen Group 6 Ranking Round 2	Sente	○
27	2/5	1618	+10	1628	Kazuo Sugimoto5-dan / age 32 1725	Oza-sen Prelim 1 Round 4	Gote	○
28	2/8	1628	+3	1631	Takehiro Ohira6-dan / age 46 1393	Kio-sen Prelims Round 1	Sente	○
29	2/15	1631	-11	1620	Wataru Kamimura5-dan / age 37 1486	Junisen Class C2 Round 10	Gote	●
30	2/19	1620	-7	1613	Eiji Iijima8-dan / age 44 1645	Osho-sen Prelim 1 Round 2	Gote	●
31	2/21	1613	+4	1617	Masakazu Kondoh7-dan / age 52 1441	NHK Cup Prelims	Sente	○
32	2/21	1613	-6	1607	Koichi Fukaura9-dan / age 52 1724	NHK Cup Prelims	Gote	●
33	2/27	1611	-5	1606	Takuya Nishida5-dan / age 32 1730	Oza-sen Prelim 1 Final	Sente	●
34	3/1	1606	+7	1613	Ao Kokubo3-dan / age 18 1576	Shinjin-o-sen Main Round 2	Sente	○
35	3/12	1613	+9	1623	Mikio Kariyama4-dan / age 22 1668	Junisen Class C2 Round 11	Sente	○
36	3/29	1623	+8	1631	Shingo Itoh6-dan / age 42 1625	Kio-sen Prelims Round 2	Gote	○

FY2022 results2W-1L

Win rate0.667

Rating1584

Annual rank103rd

Rank/title at FY end / age3-dan / age 23

No	Date	Before	Change	After	Opponent (before game)	Tournaments	Side	Result
1	5/27	1576	-8	1568	Shogo Orita4-dan / age 32 1595	Kakogawa Seiryu-sen Main Round 2	Gote	●
2	5/27	1576	+8	1584	中七海 1585	Kakogawa Seiryu-sen Main Round 1	Gote	○
3	3/20	1576	+8	1584	石本さくら 1570	Shinjin-o-sen Main Round 2	Gote	○

FY2019 results0W-1L

Win rate0.000

Rating1584

Annual rank101st

Rank/title at FY end / age3-dan / age 20

No	Date	Before	Change	After	Opponent (before game)	Tournaments	Side	Result
1	11/28	1597	-12	1584	岡井良樹アマ 1376	Shinjin-o-sen Main Round 1	Gote	●

Unofficial Elo rating calculated by this site from available game results (each fiscal year is shifted so that the average player is 1600). Up to FY1963 only Junisen games are included; from FY1964 all official games. Games without dates are ordered by estimated term and round.Method
How the deviation score is calculated: see here.