CChessStats

"Boyi Cup"China Youth Chess International Open Tournament 2025(Group A)

SwissStandard

21 players participated in this 9-round tournament, held from 31 Jul 2025 to 04 Aug 2025 in Daqing,Heilongjiang, China. 5 titled players from 5 federations. Top 10 Elo average was 2313, and top seed was Vignir Vatnar Stefansson (🇮🇸 ISL, GM, 2509).

Vignir Vatnar Stefansson (🇮🇸 ISL, GM, 2509) won with 7.5/9, ahead of Quoc Hy Nguyen (7.0) and Hongchi Peng (6.0). Stefansson took the lead from round 4.

The biggest upset came in round 8: Chujun Xie (1904) beat Jiaxiang Xie (2161), a +257-point gap.

Location
🇨🇳Daqing,Heilongjiang, China
Dates
31 Jul 2025 → 04 Aug 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss · 9 rounds
Top seed
🇮🇸GMVignir Vatnar Stefansson2509
Avg top 10
2,313
Participants
21
Titled players · 5
GM×1
IM×2
WFM×1
WCM×1
Federations · 5 represented
🇨🇳China×16
🇮🇸Iceland×2
🇲🇾Malaysia×1
🇨🇦Canada×1
🇻🇳Vietnam×1
Top 3

How it unfolded

Top 6 · 9 rounds

GM Vignir Vatnar Stefansson led from R4; +0.5-point edge over the runner-up.

Co-leaders
7
2
1
1
3
3
2
2
1
2.54.579R1R2R3R4R5R6R7R8R9Stefansson takes lead
Stefansson7.5Nguyen7Peng6Zhang5.5Zhou5Domalchuk-Jonasson5
R4 · LEADER CHANGE01 Aug

GM Vignir Vatnar Stefansson takes the sole lead (3.5/4).

R6 · HEAD-TO-HEAD · WINNER VS 2ND

GM Vignir Vatnar Stefansson drew with IM Quoc Hy Nguyen (Black).

R7–R9 · WIN STREAK

GM Vignir Vatnar Stefansson won 3 in a row (R7–R9).

Key matchups · top 4

Head-to-head between the four finishers
Player1234
1GMVignir Vatnar Stefansson*
½
½
1
2IMQuoc Hy Nguyen
½
*
½
1
3Hongchi Peng
½
½
*—
4Zhi Zhang
0
0
—*

Grille américaine

#PlayerEloFedR1R2R3R4R5R6R7R8R9PtsBu C1BuSBPerfΔ
1Stefansson, Vignir VatnarGM2509ISL+18B=7N+8B+5B=3N=2N+10B+4N+12N7.542.045.036.002528+3.1
2Nguyen, Quoc HyIM2389VIE+15B=10N+4B=3B+7N=1B+6N+14N=5B7.042.045.534.002493+12.1
3Peng, Hongchi2402CHN=14N+13B+7B=2N=1B=10N+8B=5B=6N6.043.046.530.252395+0.8
4Zhang, Zhi2249CHN=19N+14B−2N=12B=9N+13B+11N−1B+10B5.540.042.022.002230-2.0
5Zhou, Runyi2313CHN+16B+12N+6B−1N−10N=11B=9B=3N=2N5.043.547.023.752269-7.6
6Domalchuk-Jonasson, AleksandrIM2367ISL+9N+11B−5N−10B+14N+12B−2B=7N=3B5.041.044.522.502248-12.3
7Chen, Zimu(JS)2263CHN+17B=1B−3N+15N−2B−8N+20N=6B+21N5.039.540.516.252258+2.3
8Hou, Yifan(HLJ)2301CHN=13N+19B−1N=9B=15N+7B−3N=11B+18N5.038.540.518.502228-16.0
9Chen, lvheng2082CHN−6B+17N=12B=8N=4B=15B=5N=16N+13B5.035.539.020.752190+23.8
10Xie, Jiaxiang2161CHN+20N=2B=11N+6N+5B=3B−1N−12B−4N4.544.546.520.752247+20.2
11Hong, Mingren2171CHN+21B−6N=10B=18N+16B=5N−4B=8N=19B4.533.534.514.252164-1.3
12Xie, Chujun1904CHNF−5B=9N=4N+18B−6N+15B+10N−1B4.039.039.016.252201+77.7
13Wu, Shuang(HLJ)WFM2027CHN=8B−3N−18B+17N+19B−4N=16N+20B−9N4.033.535.511.752083+13.5
14Wang, Yinuo(LN)2101CHN=3B−4N=16N+21B−6BF+17N−2B=20N3.533.533.510.252123+1.5
15Jiang, Liu2091CHN−2N+20B+21N−7B=8B=9N−12NF=17B3.532.532.59.752059-8.6
16Gao,Mingze2041CHN−5N=18N=14B+20B−11N=21N=13B=9BF3.528.028.010.252038-2.0
17Liu, Henry2027CAN−7N−9B+19N−13BF+18N−14B+21B=15N3.527.027.07.752034+0.8
18Sun, Yidi2107CHN−1N=16B+13N=11B−12N−17BF+19N−8B3.034.034.010.002037-19.0
19Zhou, Weifan2008CHN=4B−8N−17BF−13N−20B+21N−18B=11N2.028.528.56.001899-46.4
20Shi, Yige1916CHN−10B−15NF−16N=21B+19N−7B−13N=14B2.027.027.04.251885-14.8
21Chua, Jia-TienWCM1933MAS−11NF−15B−14N=20N=16B−19B−17N−7B1.027.527.52.751755-30.6

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers
Top rating losers
Biggest upsets