35th iChess Cup

Open SwissStandard

53 players participated in this 6-round tournament, held from 23 Nov 2025 to 30 Nov 2025 in Seoul, South Korea. Top 10 Elo average was 1620, and top seed was Hajoon Kim (🇰🇷 KOR, 1747).

Eram Joo (🇰🇷 KOR, 1724) won with 6.0/6, ahead of Hajoon Kim (5.0) and Sihwan Choi (5.0). Joo broke clear in the final round.

The biggest upset came in round 3: Soohyeon Jin (1438) beat Jaemin Oh (1616), a +178-point gap.

Location

🇰🇷Seoul, South Korea

Dates

23 Nov 2025 → 30 Nov 2025

Time control

Standard: 60 minutes for game

System

Swiss · 6 rounds

Top seed

🇰🇷Hajoon Kim1747

Avg top 10

1,620

Participants

Federations · 1 represented

🇰🇷South Korea×42

Top 3

🥇
Eram Joo
🇰🇷KOR·1724
6.0pts·2414perf+72.0
🥈
Hajoon Kim
🇰🇷KOR·1747
5.0pts·1797perf+11.2
🥉
Sihwan Choi
🇰🇷KOR·1547
5.0pts·1720perf+24.8

How it unfolded

Top 6 · 6 rounds

Eram Joo led from R6; +1.0-point edge over the runner-up. Title race converged from 3 co-leaders at R4 to 1 by R6.

Co-leaders

Joo6Kim5Choi5Choi5Kwon4Jin4

R6–R6 · LEAD HELD

Eram Joo never relinquished the lead after R6; final gap +1.0 over the runner-up.

R6 · HEAD-TO-HEAD · WINNER VS 2ND

Eram Joo beat Hajoon Kim (Black).

WIN STREAKS · 3 top finishers

Eram Joo 6 wins (R1–R6)Hajoon Kim 5 wins (R1–R5)Juneho Choi 5 wins (R2–R6)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Eram Joo	*	1	—	1
2Hajoon Kim	0	*	—	—
3Juneho Choi	—	—	*	—
4Sihwan Choi	0	—	—	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	Pts	Bu C1	Bu	SB	Perf	Δ
1	Joo, Eram	1724	KOR	+41B	+15N	+5B	+6N	+3B	+2N	6.0	21.0	22.5	22.50	2414	+72.0
2	Kim, Hajoon	1747	KOR	+37N	+34B	+7N	+16B	+6N	−1B	5.0	19.0	21.0	15.00	1797	+11.2
3	Choi, Sihwan	1547	KOR	+27N	+43B	+31N	+19B	−1N	+7B	5.0	17.5	19.0	13.00	1720	+24.8
4	Choi, Juneho	1540	KOR	−5B	+44N	+21B	+33B	+16N	+8N	5.0	16.0	17.0	13.00	1594	+11.2
5	Kwon, Raein	1575	KOR	+4N	+9B	−1N	+17B	−7N	+15B	4.0	22.0	25.0	15.00	1681	+38.8
6	Shin, Yisoo	1720	KOR	+29N	+18B	+12N	−1B	−2B	+17N	4.0	20.5	23.0	12.00	1603	-22.8
7	Chung, Inho	1475	KOR	+20N	+28B	−2B	+36N	+5B	−3N	4.0	19.5	21.5	11.50	1498	+1.2
8	Jin, Soohyeon	1438	KOR	+50B	−22N	+9N	+10B	+25N	−4B	4.0	18.5	18.5	10.50	1624	+50.4
9	Oh, Jaemin	1616	KOR	+13B	−5N	−8B	+41N	+12B	+18N	4.0	18.0	19.5	11.50	1360	-44.4
10	Kim, Sunyong	1574	KOR	+44B	−12N	+30B	−8N	+21B	+11N	4.0	16.5	17.5	10.00	1592	+12.4
11	Kim, Taeu	1536	KOR	+35N	+26B	−16N	+20B	+15N	−10B	4.0	15.5	17.5	10.50	1497	-6.0
12	Lee, Jihun B	0	KOR	+25N	+10B	−6B	=14N	−9N	+?B	3.5	18.0	18.0	8.25	1588	0.0
13	Hong, Taeyeon	0	KOR	−9N	−24B	+27N	=?B	+28B	+30N	3.5	13.5	13.5	7.00	1358	0.0
14	Kim, Yeonseo	1544	KOR	+38B	−31N	+41B	=12B	−19N	+?N	3.5	12.0	12.0	5.25	1519	0.0
15	Park, Sihun	1458	KOR	+24N	−1B	+26N	+31B	−11B	−5N	3.0	19.0	21.0	7.00	811	-40.0
16	Shin, Seojun	0	KOR	+32B	+?N	+11B	−2N	−4B	−?N	3.0	16.0	16.0	6.00	1551	0.0
17	Hwang, Noel	1449	KOR	+51B	−19N	+24B	−5N	+26B	−6B	3.0	16.0	16.0	5.00	1376	-22.0
18	Oh, Yechan	1466	KOR	+52B	−6N	−20B	+43N	+24B	−9B	3.0	15.0	15.0	4.00	879	-17.6
19	Chung, Jaeheon	1586	KOR	+21N	+17B	F	−3N	+14B	F	3.0	14.5	14.5	9.50	1522	-3.0
20	Lim, Chanhee	0	KOR	−7B	+42B	+18N	−11N	+30B	−?B	3.0	14.5	14.5	6.50	1417	0.0
21	Jang, Minwook	0	KOR	−19B	+50N	−4N	+?B	−10N	+31B	3.0	14.0	14.0	2.00	1332	0.0
22	Bang, Jaeyun	1570	KOR	+45N	+8B	+33N	F	F	F	3.0	7.0	7.0	7.00	2237	+12.8
23	FIDE 13232380	0	—	F	F	F	+?N	+?B	+25B	3.0	2.5	2.5	2.50	1499	0.0
24	Park, Sejin A	0	KOR	−15B	+13N	−17N	+42B	−18N	=29B	2.5	15.0	16.5	6.25	1264	0.0
25	Kwak, Yeseong	1493	KOR	−12B	=45N	+32B	+28N	−8B	−23N	2.5	15.0	16.0	5.00	1442	-7.6
26	Son, Dojun	0	KOR	+30B	−11N	−15B	+?N	−17N	=27B	2.5	14.5	14.5	3.25	1299	0.0
27	Kim, Sehyeon	0	KOR	−3B	−?N	−13B	+44N	+32B	=26N	2.5	14.0	14.0	4.25	1478	0.0
28	Suh, Hannah	0	KOR	+42N	−7N	=45B	−25B	−13N	+?B	2.5	12.5	12.5	2.00	1463	0.0
29	Cho, Yongjun	0	KOR	−6B	+51N	−?B	−?B	+42N	=24N	2.5	8.0	8.0	2.75	1455	0.0
30	Cho, Jungbin	1416	KOR	−26N	+35B	−10N	+45B	−20N	−13B	2.0	15.0	16.0	3.00	712	0.0
31	Lim, Hyeonwoo	0	KOR	+?N	+14B	−3B	−15N	−?B	−21N	2.0	14.5	14.5	3.50	1304	0.0
32	An, Teaha	1447	KOR	−16N	−36B	−25N	+39B	−27N	+45B	2.0	12.0	13.0	3.00	709	-16.4
33	Lee, Seungjun	0	KOR	+?N	+?B	−22B	−4N	−?B	−?N	2.0	8.0	8.0	0.00	1376	0.0
34	Maeng, Chihyun	1471	KOR	+46N	−2N	+43B	F	F	F	2.0	7.5	7.5	2.50	949	-7.2
35	Lee, Chaewon	0	KOR	−11B	−30N	+44B	−?N	+?N	−?B	2.0	7.0	7.0	1.00	1360	0.0
36	Kutbidinov, Aydar	0	KOR	−?B	+32N	+?B	−7B	−?N	−?N	2.0	6.0	6.0	2.00	1374	0.0
37	Cho, Ilwoong	0	KOR	−2B	+52N	+?N	F	F	F	2.0	5.0	5.0	0.00	1648	0.0
38	Kim, Sihoo A	0	KOR	−14N	+?B	+?N	F	F	F	2.0	3.5	3.5	0.00	1514	0.0
39	Kim, Rayon	0	KOR	F	F	F	−32N	+53B	+44N	2.0	3.0	3.0	1.00	1430	0.0
40	FIDE 13237314	0	—	F	F	F	−?N	+?B	+41N	2.0	1.5	1.5	1.50	685	0.0
41	FIDE 13237349	0	—	−1N	+46B	−14N	−9B	=?N	−40B	1.5	16.5	16.5	1.00	1343	0.0
42	Yun, Yejoon	1403	KOR	−28B	−20N	+51B	−24N	−29B	=43N	1.5	12.0	12.0	0.75	2219	+20.8
43	Lee, Seoha	0	KOR	+?B	−3N	−34N	−18B	−?N	=42B	1.5	11.5	11.5	0.75	1332	0.0
44	FIDE 13236148	0	—	−10N	−4B	−35N	−27B	+47N	−39B	1.0	15.5	16.5	1.00	718	-28.4
45	Kim, Howon	0	KOR	−22B	=25B	=28N	−30N	−?B	−32N	1.0	12.0	12.0	2.50	1182	0.0
46	FIDE 13216848	0	—	−34B	−41N	+53B	F	F	F	1.0	3.5	3.5	0.00	688	0.0
47	FIDE 13237284	0	—	F	F	F	−?N	−44B	+?N	1.0	1.0	1.0	0.00	611	0.0
48	FIDE 13234943	0	—	F	F	F	−?N	−?B	+?B	1.0	0.0	0.0	0.00	656	0.0
49	FIDE 13237250	0	—	F	F	F	+?B	−?N	−?B	1.0	0.0	0.0	0.00	674	0.0
50	FIDE 13236156	0	—	−8N	−21B	F	F	F	F	0.0	7.0	7.0	0.00	637	0.0
51	Park, Seojin A	0	KOR	−17N	−29B	−42N	F	F	F	0.0	7.0	7.0	0.00	644	-37.2
52	FIDE 13231049	0	—	−18N	−37B	−?N	F	F	F	0.0	5.0	5.0	0.00	672	0.0
53	FIDE 13230999	0	—	−?N	−?B	−46N	−?B	−39N	F	0.0	3.0	3.0	0.00	705	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Joo, EramKOR
+72.0
6.0 pts · #1
2Jin, SoohyeonKOR
+50.4
4.0 pts · #3
3Kwon, RaeinKOR
+38.8
4.0 pts · #2

Top rating losers

1Oh, JaeminKOR
-44.4
4.0 pts · #32
2Park, SihunKOR
-40.0
3.0 pts · #41
3Park, Seojin AKOR
-37.2
0.0 pts · #47

Biggest upsets

R3+178 Elo gap
Jin, Soohyeon1438 beat Oh, Jaemin1616
R4+136 Elo gap
Jin, Soohyeon1438 beat Kim, Sunyong1574