5th Big Rook International Chess Festival Challenger 2025
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.
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How it unfolded
Top 6 · 9 roundsRathasart 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.
Rathasart Jiroajvanichakorn takes the sole lead (6.0/7).
Rathasart Jiroajvanichakorn drew with Jeremi Nodon (Black).
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| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Rathasart Jiroajvanichakorn | * | ½ | 1 | ½ |
| 2Jeremi Nodon | ½ | * | ½ | 1 |
| 3Jarunpol Sajjapornthep | 0 | ½ | * | 1 |
| 4Adriel Josh Halabaso | ½ | 0 | 0 | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 | R9 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Jiroajvanichakorn, Rathasart | 1822 | THA | +16N | +6B | =4N | +12B | =2N | +3B | +5B | +7N | +9B | 8.0 | 43.0 | 46.5 | 40.25 | 2059 | +83.6 |
| 2 | Nodon, Jeremi | 1893 | JPN | +17B | +23N | +15B | =3N | =1B | −5N | +4N | =12B | +6N | 6.5 | 42.0 | 43.5 | 28.75 | 1894 | +4.2 |
| 3 | Sajjapornthep, Jarunpol | 1842 | THA | +13B | F | +24N | =2B | +4N | −1N | +6B | +5N | +11B | 6.5 | 41.0 | 41.0 | 29.75 | 1937 | +20.0 |
| 4 | Halabaso, Adriel Josh | 1653 | PHI | +10B | +5N | =1B | +15N | −3B | +12N | −2B | +13N | =7B | 6.0 | 44.0 | 47.5 | 28.00 | 1897 | +90.0 |
| 5 | Gutsulyak, Nikolay | 1855 | RUS | +11N | −4B | +8N | +6B | +19N | +2B | −1N | −3B | =12N | 5.5 | 45.5 | 49.0 | 26.50 | 1786 | -11.8 |
| 6 | Suwitchanpan, Natthabhumi | 1584 | THA | +26B | −1N | +25B | −5N | +9B | +19B | −3N | +15N | −2B | 5.0 | 39.0 | 39.5 | 13.00 | 1712 | +41.6 |
| 7 | Chen, Zixi | 0 | CHN | −23B | −13N | +10B | +17N | =15B | +18N | +20B | −1B | =4N | 5.0 | 35.5 | 37.0 | 18.75 | 1574 | 0.0 |
| 8 | Zheng, Yijin | 0 | CHN | =9B | +14N | −5B | =24N | +16B | −13N | =11N | =10B | +17B | 5.0 | 34.0 | 35.5 | 18.50 | 1602 | 0.0 |
| 9 | Lai, Yun-Cheng | 1538 | TPE | =8N | +20B | −12N | +18B | −6N | −15B | +17B | +16N | −1N | 4.5 | 36.0 | 38.5 | 15.50 | 1609 | +23.2 |
| 10 | Chen Yong-Ye | 0 | TPE | −4N | =11B | −7N | +21N | =17B | =16B | +14N | =8N | =15B | 4.5 | 35.0 | 37.5 | 16.50 | 1580 | 0.0 |
| 11 | Lisin, Maksim | 1526 | RUS | −5B | =10N | −21B | +14N | =23B | +24N | =8B | +19N | −3N | 4.5 | 33.0 | 34.5 | 14.50 | 1662 | +46.4 |
| 12 | Lozano, Arvie | 1941 | PHI | +20N | F | +9B | −1N | +24B | −4B | F | =2N | =5B | 4.0 | 34.5 | 34.5 | 14.50 | 1759 | -27.4 |
| 13 | Pinphetsawan, Sirikwan | 1501 | THA | −3N | +7B | −19N | +23N | F | +8B | F | −4B | +25N | 4.0 | 28.5 | 28.5 | 12.50 | 1501 | -1.0 |
| 14 | Siripatvanich, Nonglak | 1567 | THA | −18N | −8B | F | −11B | +25N | +21N | −10B | +20N | +16B | 4.0 | 27.0 | 27.0 | 9.50 | 1690 | +12.4 |
| 15 | Camhi, David | 1712 | TPE | F | +18B | −2N | −4B | =7N | +9N | =19B | −6B | =10N | 3.5 | 38.5 | 40.5 | 14.50 | 1519 | -25.8 |
| 16 | Chimyam, Jakkawan | 1485 | THA | −1B | +26N | +23B | −19B | −8N | =10N | +18B | −9B | −14N | 3.5 | 34.5 | 35.0 | 7.75 | 1399 | -10.8 |
| 17 | Allen, Sherwin | 1543 | USA | −2N | +21B | −18N | −7B | =10N | +26B | −9N | +22B | −8N | 3.5 | 33.5 | 34.0 | 7.25 | 1576 | +4.0 |
| 18 | Wang Jian | 0 | TPE | +14B | −15N | +17B | −9N | =20N | −7B | −16N | =26B | =21B | 3.5 | 29.0 | 29.5 | 10.25 | 1494 | 0.0 |
| 19 | Angkanawin, Siwabannakorn | 1686 | THA | F | F | +13B | +16N | −5B | −6N | =15N | −11B | +26N | 3.5 | 26.5 | 26.5 | 9.75 | 1554 | -21.8 |
| 20 | Du, Jonathan Bao | 1544 | USA | −12B | −9N | +26B | +25N | =18B | F | −7N | −14B | −22N | 2.5 | 24.5 | 24.5 | 3.25 | 822 | -68.0 |
| 21 | Wongbunchailert, Rawat | 1431 | THA | −24B | −17N | +11N | −10B | +26N | −14B | −25B | F | =18N | 2.5 | 23.0 | 23.0 | 6.75 | 1380 | -10.4 |
| 22 | Uapongkitikul, Pavatt | 1453 | THA | F | F | F | F | F | F | +26N | −17N | +20B | 2.0 | 10.0 | 10.0 | 3.00 | 1544 | +9.6 |
| 23 | Kurniawan, Alexander Philip | 1595 | INA | +7N | −2B | −16N | −13B | =11N | F | F | F | F | 1.5 | 23.5 | 23.5 | 7.25 | 1279 | -61.2 |
| 24 | Douarinou, Erwan | 1655 | BEL | +21N | F | −3B | =8B | −12N | −11B | F | F | F | 1.5 | 23.5 | 23.5 | 5.00 | 1492 | -34.8 |
| 25 | Shakhin, Alexey | 0 | CZE | F | F | −6N | −20B | −14B | F | +21N | F | −13B | 1.0 | 19.5 | 19.5 | 2.50 | 1286 | 0.0 |
| 26 | Khuijanthuek, Kannika | 0 | THA | −6N | −16B | −20N | F | −21B | −17N | −22B | =18N | −19B | 0.5 | 26.0 | 26.0 | 1.75 | 732 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Halabaso, Adriel JoshPHI+90.06.0 pts · #4
- 2Jiroajvanichakorn, RathasartTHA+83.68.0 pts · #1
- 3Lisin, MaksimRUS+46.44.5 pts · #9
- 1Du, Jonathan BaoUSA-68.02.5 pts · #26
- 2Kurniawan, Alexander PhilipINA-61.21.5 pts · #24
- 3Douarinou, ErwanBEL-34.81.5 pts · #20
- R6+288 Elo gap
- R2+202 Elo gap
- R8+160 Elo gap