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5th Big Rook International Chess Festival Challenger 2025

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26 players participated in this 9-round tournament, held from 07 May 2025 to 12 May 2025 in Bangkok, Thailand. 8 federations represented. Top 10 Elo average was 1765, and top seed was Arvie Lozano (🇵🇭 PHI, 1941).

Rathasart Jiroajvanichakorn (🇹🇭 THA, 1822) won with 8.0/9, ahead of Jeremi Nodon (6.5) and Jarunpol Sajjapornthep (6.5). Jiroajvanichakorn shared the lead from round 4 and won solo starting round 7.

The biggest upset came in round 6: Adriel Josh Halabaso (1653) beat Arvie Lozano (1941), a +288-point gap.

Location
🇹🇭Bangkok, Thailand
Dates
07 May 2025 → 12 May 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss · 9 rounds
Top seed
🇵🇭Arvie Lozano1941
Avg top 10
1,765
Participants
26
Federations · 8 represented
🇹🇭Thailand×10
🇹🇼Chinese Taipei×4
🇵🇭Philippines×2
🇺🇸United States of America×2
🇨🇳China×2
🇷🇺Russia×2
🇨🇿Czech Republic×1
🇯🇵Japan×1
Top 3

How it unfolded

Top 6 · 9 rounds

Rathasart Jiroajvanichakorn led from R7; +1.5-point edge over the runner-up. Title race converged from 3 co-leaders at R4 to 1 by R7.

Co-leaders
10
3
1
3
3
2
1
1
1
2.54.579R1R2R3R4R5R6R7R8R9Jiroajvanichakorn takes lead
R7 · LEADER CHANGE10 May

Rathasart Jiroajvanichakorn takes the sole lead (6.0/7).

R5 · HEAD-TO-HEAD · WINNER VS 2ND

Rathasart Jiroajvanichakorn drew with Jeremi Nodon (Black).

WIN STREAKS · 3 top finishers

Rathasart Jiroajvanichakorn 4 wins (R6–R9)Jeremi Nodon 3 wins (R1–R3)Jarunpol Sajjapornthep 3 wins (R7–R9)

Key matchups · top 4

Head-to-head between the four finishers

Grille américaine

#PlayerEloFedR1R2R3R4R5R6R7R8R9PtsBu C1BuSBPerfΔ
1Jiroajvanichakorn, Rathasart1822THA+16N+6B=4N+12B=2N+3B+5B+7N+9B8.043.046.540.252059+83.6
2Nodon, Jeremi1893JPN+17B+23N+15B=3N=1B−5N+4N=12B+6N6.542.043.528.751894+4.2
3Sajjapornthep, Jarunpol1842THA+13BF+24N=2B+4N−1N+6B+5N+11B6.541.041.029.751937+20.0
4Halabaso, Adriel Josh1653PHI+10B+5N=1B+15N−3B+12N−2B+13N=7B6.044.047.528.001897+90.0
5Gutsulyak, Nikolay1855RUS+11N−4B+8N+6B+19N+2B−1N−3B=12N5.545.549.026.501786-11.8
6Suwitchanpan, Natthabhumi1584THA+26B−1N+25B−5N+9B+19B−3N+15N−2B5.039.039.513.001712+41.6
7Chen, Zixi0CHN−23B−13N+10B+17N=15B+18N+20B−1B=4N5.035.537.018.7515740.0
8Zheng, Yijin0CHN=9B+14N−5B=24N+16B−13N=11N=10B+17B5.034.035.518.5016020.0
9Lai, Yun-Cheng1538TPE=8N+20B−12N+18B−6N−15B+17B+16N−1N4.536.038.515.501609+23.2
10Chen Yong-Ye0TPE−4N=11B−7N+21N=17B=16B+14N=8N=15B4.535.037.516.5015800.0
11Lisin, Maksim1526RUS−5B=10N−21B+14N=23B+24N=8B+19N−3N4.533.034.514.501662+46.4
12Lozano, Arvie1941PHI+20NF+9B−1N+24B−4BF=2N=5B4.034.534.514.501759-27.4
13Pinphetsawan, Sirikwan1501THA−3N+7B−19N+23NF+8BF−4B+25N4.028.528.512.501501-1.0
14Siripatvanich, Nonglak1567THA−18N−8BF−11B+25N+21N−10B+20N+16B4.027.027.09.501690+12.4
15Camhi, David1712TPEF+18B−2N−4B=7N+9N=19B−6B=10N3.538.540.514.501519-25.8
16Chimyam, Jakkawan1485THA−1B+26N+23B−19B−8N=10N+18B−9B−14N3.534.535.07.751399-10.8
17Allen, Sherwin1543USA−2N+21B−18N−7B=10N+26B−9N+22B−8N3.533.534.07.251576+4.0
18Wang Jian0TPE+14B−15N+17B−9N=20N−7B−16N=26B=21B3.529.029.510.2514940.0
19Angkanawin, Siwabannakorn1686THAFF+13B+16N−5B−6N=15N−11B+26N3.526.526.59.751554-21.8
20Du, Jonathan Bao1544USA−12B−9N+26B+25N=18BF−7N−14B−22N2.524.524.53.25822-68.0
21Wongbunchailert, Rawat1431THA−24B−17N+11N−10B+26N−14B−25BF=18N2.523.023.06.751380-10.4
22Uapongkitikul, Pavatt1453THAFFFFFF+26N−17N+20B2.010.010.03.001544+9.6
23Kurniawan, Alexander Philip1595INA+7N−2B−16N−13B=11NFFFF1.523.523.57.251279-61.2
24Douarinou, Erwan1655BEL+21NF−3B=8B−12N−11BFFF1.523.523.55.001492-34.8
25Shakhin, Alexey0CZEFF−6N−20B−14BF+21NF−13B1.019.519.52.5012860.0
26Khuijanthuek, Kannika0THA−6N−16B−20NF−21B−17N−22B=18N−19B0.526.026.01.757320.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers
Top rating losers
Biggest upsets
5th Big Rook International Chess Festival Challenger 2025 — Bangkok, Thailand | Chess Tournament Results | ChessStats