36th iChess Cup
Open SwissStandard
55 players participated in this 6-round tournament, held from 04 Jan 2026 to 11 Jan 2026 in Seoul, South Korea. 3 federations represented. Top 10 Elo average was 1630, and top seed was David Oh (🇺🇸 USA, 1704).
David Oh (🇺🇸 USA, 1704) won with 5.5/6, ahead of Yisoo Shin (5.0) and Jaemin Bae (4.5). Oh won solo starting round 4.
The biggest upset came in round 1: Jungbin Cho (1405) beat Hanjun A Kim (1589), a +184-point gap.
Location
🇰🇷Seoul, South Korea
Dates
04 Jan 2026 → 11 Jan 2026
Time control
Standard: 60 minutes for game
System
Swiss · 6 rounds
Federations · 3 represented
🇰🇷South Korea×42
🇺🇸United States of America×1
🇬🇺Guam×1
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 6 roundsDavid Oh led from R4; +0.5-point edge over the runner-up.
Co-leaders
25
11
3
1
1
1
R4–R6 · LEAD HELD
David Oh held the sole lead from R4 through R6 without losing it.
R6 · HEAD-TO-HEAD · WINNER VS 2ND
David Oh drew with Yisoo Shin (Black).
R1–R5 · WIN STREAK
David Oh won 5 in a row (R1–R5).
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1David Oh | * | ½ | — | — |
| 2Yisoo Shin | ½ | * | 1 | — |
| 3Raein Kwon | — | 0 | * | — |
| 4Jaemin Bae | — | — | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Oh, David | 1704 | USA | +25B | +15N | +22B | +7N | +13B | =2N | 5.5 | 19.0 | 22.0 | 19.50 | 1942 | +49.6 |
| 2 | Shin, Yisoo | 1681 | KOR | +21N | +10B | =8N | +14B | +4N | =1B | 5.0 | 21.5 | 24.5 | 19.75 | 1813 | +31.2 |
| 3 | Bae, Jaemin | 1632 | KOR | +23B | −7N | +32B | +15N | +8B | =5N | 4.5 | 19.0 | 21.0 | 14.75 | 1706 | +22.8 |
| 4 | Kwon, Raein | 1606 | KOR | +41B | =13N | +19B | +27N | −2B | +7N | 4.5 | 18.5 | 19.5 | 12.75 | 1739 | +43.2 |
| 5 | Oh, Jaemin | 1577 | KOR | +44N | +33B | −14N | +9B | +21N | =3B | 4.5 | 17.0 | 18.0 | 12.25 | 1678 | +22.0 |
| 6 | Choi, Sihwan | 1574 | KOR | +42B | +39N | −7B | =16N | +27B | +13N | 4.5 | 15.5 | 16.5 | 10.75 | 1646 | +15.2 |
| 7 | Han, Seunghyeon | 1492 | KOR | +26N | +3B | +6N | −1B | +10N | −4B | 4.0 | 23.0 | 26.0 | 16.00 | 1628 | +27.2 |
| 8 | Kim, Junesun | 1542 | GUM | +52B | +19N | =2B | =17N | −3N | +21B | 4.0 | 19.5 | 19.5 | 10.75 | 1685 | +38.0 |
| 9 | Jin, Soohyeon | 1492 | KOR | +24B | +12N | −30B | −5N | +32B | +22N | 4.0 | 17.0 | 19.0 | 12.00 | 1634 | +40.4 |
| 10 | Kim, Yeonseo | 1552 | KOR | +35B | −2N | +41B | +29N | −7B | +23N | 4.0 | 16.5 | 17.5 | 8.50 | 1530 | 0.0 |
| 11 | Son, Haseong | 1597 | KOR | +40N | −14B | −21N | +35B | +28N | +18B | 4.0 | 14.5 | 15.5 | 9.00 | 1536 | -16.0 |
| 12 | Chung, Jaeheon | 1588 | KOR | +36N | −9B | +28N | +33B | +14N | F | 4.0 | 14.0 | 14.0 | 10.00 | 1725 | +17.6 |
| 13 | Oshiro, Souta | 1489 | KOR | +51N | =4B | +18N | +20B | −1N | −6B | 3.5 | 21.5 | 21.5 | 9.25 | 1570 | +22.4 |
| 14 | Kim, Taeu | 1521 | KOR | +43B | +11N | +5B | −2N | −12B | =17N | 3.5 | 21.0 | 22.0 | 11.25 | 1653 | +36.4 |
| 15 | Kim, Danha | 1543 | KOR | +38N | −1B | +40N | −3B | +37N | =16B | 3.5 | 17.5 | 18.5 | 6.75 | 1467 | -17.6 |
| 16 | Lee, Yoonsoo | 1481 | KOR | +37N | −20B | +34N | =6B | =17B | =15N | 3.5 | 17.0 | 19.0 | 9.75 | 1490 | +1.2 |
| 17 | Choi, Jungwoon | 1656 | KOR | +32B | −27N | +23B | =8B | =16N | =14B | 3.5 | 16.5 | 18.5 | 10.50 | 1557 | -28.8 |
| 18 | Park, Sihun | 1422 | KOR | =30B | +45N | −13B | +24B | +20N | −11N | 3.5 | 16.5 | 17.5 | 8.75 | 1468 | +4.0 |
| 19 | Cho, Minje | 1634 | KOR | +28N | −8B | −4N | +34B | =29B | +27N | 3.5 | 16.0 | 18.0 | 8.25 | 1524 | -27.6 |
| 20 | Kim, Sunyong | 1577 | KOR | +34B | +16N | =27B | −13N | −18B | +29N | 3.5 | 15.5 | 17.5 | 9.25 | 1486 | -10.0 |
| 21 | Kim, Jio | 1465 | KOR | −2B | +35N | +11B | +22N | −5B | −8N | 3.0 | 20.5 | 22.5 | 9.00 | 1526 | +13.6 |
| 22 | Lee, Chanjoo | 1569 | KOR | +53N | +29B | −1N | −21B | +24N | −9B | 3.0 | 18.0 | 18.0 | 5.50 | 1345 | -46.8 |
| 23 | An, Teaha | 1430 | KOR | −3N | +26B | −17N | +46B | +33N | −10B | 3.0 | 17.0 | 18.0 | 6.00 | 1474 | +6.0 |
| 24 | Li, Yunhan | 0 | KOR | −9N | +36B | +25B | −18N | −22B | +32N | 3.0 | 15.5 | 17.5 | 7.00 | 1475 | 0.0 |
| 25 | Kim, Moonso | 1471 | KOR | −1N | +38B | −24N | −37B | +50N | +36B | 3.0 | 14.5 | 14.5 | 4.00 | 1564 | +5.0 |
| 26 | Lee, Seowon | 0 | KOR | −7B | −23N | +53N | −28B | +35N | +33B | 3.0 | 13.5 | 13.5 | 4.00 | 1281 | 0.0 |
| 27 | Choi, Juneho | 1540 | KOR | +47N | +17B | =20N | −4B | −6N | −19B | 2.5 | 19.5 | 20.5 | 6.25 | 1449 | -22.8 |
| 28 | Suh, Hannah | 1450 | KOR | −19B | +52N | −12B | +26N | −11B | =31N | 2.5 | 17.0 | 17.0 | 4.25 | 800 | -36.0 |
| 29 | Kwak, Yeseong | 1478 | KOR | +46B | −22N | +42B | −10B | =19N | −20B | 2.5 | 15.0 | 16.0 | 3.75 | 1301 | -26.4 |
| 30 | Bok, Junggyu | 1612 | KOR | =18N | +54B | +9N | F | F | F | 2.5 | 7.5 | 7.5 | 5.75 | 1780 | +11.6 |
| 31 | Lee, Kiwon | 0 | KOR | F | F | F | +?B | +34N | =28B | 2.5 | 4.5 | 4.5 | 3.25 | 1451 | 0.0 |
| 32 | An, Seunggi | 1459 | KOR | −17N | +47B | −3N | +38B | −9N | −24B | 2.0 | 17.0 | 18.0 | 3.00 | 790 | -39.6 |
| 33 | Kutbidinov, Aydar | 1484 | KOR | +50B | −5N | +45B | −12N | −23B | −26N | 2.0 | 15.5 | 15.5 | 1.00 | 733 | -56.4 |
| 34 | Cho, Ilwoong | 0 | KOR | −20N | +37B | −16B | −19N | −31B | +51N | 2.0 | 15.0 | 15.0 | 2.00 | 744 | 0.0 |
| 35 | FIDE 13236148 | 0 | — | −10N | −21B | +51N | −11N | −26B | +50B | 2.0 | 14.0 | 14.0 | 0.00 | 736 | 0.0 |
| 36 | Yun, Yejoon | 1404 | KOR | −12B | −24N | −43B | +49N | +48B | −25N | 2.0 | 12.0 | 13.0 | 2.00 | 703 | -47.6 |
| 37 | Park, Sejin A | 0 | KOR | −16B | −34N | +52B | +25N | −15B | −?N | 2.0 | 12.0 | 12.0 | 3.00 | 1370 | 0.0 |
| 38 | FIDE 13238620 | 0 | — | −15B | −25N | +50B | −32N | −?N | +48B | 2.0 | 9.5 | 9.5 | 1.00 | 689 | 0.0 |
| 39 | Maeng, Chihyun | 1475 | KOR | +55N | −6B | +44N | F | F | F | 2.0 | 5.5 | 5.5 | 1.00 | 787 | -14.4 |
| 40 | Shin, Seojun A | 1410 | KOR | −11B | +43N | −15B | F | F | F | 1.0 | 8.5 | 8.5 | 1.00 | 1412 | +0.4 |
| 41 | Yim, Jeongbeen | 1419 | KOR | −4N | +51B | −10N | F | F | F | 1.0 | 8.5 | 8.5 | 0.00 | 797 | -11.6 |
| 42 | Jang, Minwook | 0 | KOR | −6N | +55B | −29N | F | F | F | 1.0 | 7.0 | 7.0 | 0.00 | 739 | 0.0 |
| 43 | Lee, Seoha | 0 | KOR | −14N | −40B | +36N | F | F | F | 1.0 | 6.5 | 6.5 | 2.00 | 1335 | -21.6 |
| 44 | FIDE 13238531 | 0 | — | −5B | +50N | −39B | F | F | F | 1.0 | 6.5 | 6.5 | 0.00 | 738 | 0.0 |
| 45 | Cho, Jungbin | 1405 | KOR | +54N | −18B | −33N | F | F | F | 1.0 | 5.5 | 5.5 | 0.00 | 1390 | 0.0 |
| 46 | FIDE 13238639 | 0 | — | −29N | +53B | F | −23N | −?B | F | 1.0 | 5.5 | 5.5 | 0.00 | 661 | 0.0 |
| 47 | Lee, Juhyun | 0 | KOR | −27B | −32N | +54N | F | F | F | 1.0 | 4.5 | 4.5 | 0.00 | 1404 | 0.0 |
| 48 | FIDE 13238604 | 0 | — | F | F | F | +51B | −36N | −38N | 1.0 | 4.0 | 4.0 | 0.00 | 627 | 0.0 |
| 49 | FIDE 13238647 | 0 | — | F | F | F | −36B | +?N | −?B | 1.0 | 2.0 | 2.0 | 0.00 | 627 | 0.0 |
| 50 | FIDE 13238612 | 0 | — | −33N | −44B | −38N | F | −25B | −35N | 0.0 | 10.0 | 10.0 | 0.00 | 688 | 0.0 |
| 51 | FIDE 13238590 | 0 | — | −13B | −41N | −35B | −48N | F | −34B | 0.0 | 9.5 | 9.5 | 0.00 | 664 | 0.0 |
| 52 | FIDE 13238558 | 0 | — | −8N | −28B | −37N | F | F | F | 0.0 | 8.5 | 8.5 | 0.00 | 700 | 0.0 |
| 53 | FIDE 13234943 | 0 | — | −22B | −46N | −26B | F | F | F | 0.0 | 7.0 | 7.0 | 0.00 | 769 | 0.0 |
| 54 | Kim, Hanjun A | 1589 | KOR | −45B | −30N | −47B | F | F | F | 0.0 | 4.5 | 4.5 | 0.00 | 812 | -18.8 |
| 55 | FIDE 13230328 | 0 | — | −39B | −42N | F | F | F | F | 0.0 | 3.0 | 3.0 | 0.00 | 681 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Oh, DavidUSA+49.65.5 pts · #1
- 2Kwon, RaeinKOR+43.24.5 pts · #2
- 3Jin, SoohyeonKOR+40.44.0 pts · #13
Top rating losers
- 1Kutbidinov, AydarKOR-56.42.0 pts · #37
- 2Yun, YejoonKOR-47.62.0 pts · #50
- 3Lee, ChanjooKOR-46.83.0 pts · #26
Biggest upsets
- R1+184 Elo gap
- R5+155 Elo gap
- R2+140 Elo gap