Aruba Chess Challenge 2025 U-18
29 players participated in this 7-round tournament, held from 09 Oct 2025 to 12 Oct 2025 in Oranjestad, Aruba. 3 federations represented. Top 10 Elo average was 1581, and top seed was Juan Sebastiaan Vergara Rivera (🇦🇼 ARU, 1757).
Vashist Gajadien (🇸🇷 SUR, 1515) won with 6.0/7, ahead of Sylvi Cabral (5.5) and Mohit Sharma (5.0). Gajadien broke clear in the final round.
The biggest upset came in round 5: Vashist Gajadien (1515) beat Juan Sebastiaan Vergara Rivera (1757), a +242-point gap.
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How it unfolded
Top 6 · 7 roundsVashist Gajadien led from R7; +0.5-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R7.
Vashist Gajadien held the sole lead from R7 through R7 without losing it.
Vashist Gajadien drew with Sylvi Cabral (Black).
Vashist Gajadien 3 wins (R1–R3)Sylvi Cabral 3 wins (R1–R3)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Vashist Gajadien | * | ½ | — | — |
| 2Sylvi Cabral | ½ | * | — | — |
| 3Amir Ayubi | — | — | * | — |
| 4Mohit Sharma | — | — | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Gajadien, Vashist | 1515 | SUR | +26N | +16B | +8B | =22N | +10B | =2N | +9B | 6.0 | 23.5 | 25.5 | 21.50 | 1854 | +84.8 |
| 2 | Cabral, Sylvi | 1490 | ARU | +18B | +17N | +9B | =10N | +22B | =1B | =8N | 5.5 | 24.0 | 26.5 | 19.50 | 1769 | +73.2 |
| 3 | Sharma, Mohit | 1571 | ARU | +27N | =6B | −12N | +19B | +13N | +5B | =10B | 5.0 | 24.0 | 26.0 | 17.75 | 1427 | -15.2 |
| 4 | Ayubi, Amir | 1621 | AHO | +7N | +20B | −22B | +25N | +11B | −9N | +17B | 5.0 | 21.0 | 23.0 | 16.50 | 1412 | -33.6 |
| 5 | Ridderstaat, Janoah L J | 0 | ARU | +?B | =11N | +14B | =8N | =23B | −3N | +19B | 4.5 | 22.5 | 22.5 | 12.25 | 1552 | 0.0 |
| 6 | Paez Marin, Miguel E. | 0 | ARU | +?B | =3N | −11B | +?N | −8B | +?N | +23B | 4.5 | 15.5 | 15.5 | 5.00 | 1552 | 0.0 |
| 7 | Gopal Jaden | 0 | SUR | −4B | +?N | =?B | −17N | +29N | +24B | +22N | 4.5 | 14.0 | 14.0 | 6.00 | 1524 | 0.0 |
| 8 | Wu, Jie-Peng | 1713 | AHO | F | +13B | −1N | =5B | +6N | +12B | =2B | 4.0 | 28.5 | 28.5 | 17.50 | 1496 | -32.8 |
| 9 | Burgers, Cle Antonius | 1612 | ARU | F | +19B | −2N | +24B | +15N | +4B | −1N | 4.0 | 26.0 | 26.0 | 14.50 | 1418 | -31.6 |
| 10 | Vergara Rivera, Juan Sebastiaan | 1757 | ARU | F | +14B | +23N | =2B | −1N | +22B | =3N | 4.0 | 25.5 | 25.5 | 14.25 | 1635 | -32.8 |
| 11 | de Roo, Patrick J. | 1498 | ARU | F | =5B | +6N | =12B | −4N | +23N | +25B | 4.0 | 22.5 | 22.5 | 13.25 | 1544 | +7.6 |
| 12 | Karamchandani, Piyush | 1482 | ARU | +24N | F | +3B | =11N | =17B | −8N | +16B | 4.0 | 22.0 | 22.0 | 14.50 | 1594 | +17.2 |
| 13 | Cen, Rui Zhen Winson | 0 | ARU | +?B | −8N | =17B | +?N | −3B | =16N | +18B | 4.0 | 18.5 | 18.5 | 6.25 | 1453 | 0.0 |
| 14 | Lockhart, Brooke | 1453 | ARU | +28B | −10N | −5N | +29B | +18B | −25N | +26B | 4.0 | 17.0 | 18.0 | 7.50 | 957 | -5.6 |
| 15 | Rafini, Sophie-Belle | 0 | ARU | +21B | −22N | +27B | +?N | −9B | −17N | +24B | 4.0 | 17.0 | 17.0 | 7.50 | 757 | 0.0 |
| 16 | Purushotamdas, Aryan | 0 | ARU | +?B | −1N | +20N | −23B | +19N | =13B | −12N | 3.5 | 22.5 | 22.5 | 8.00 | 709 | 0.0 |
| 17 | Fernandez Ojeda, Adrian Gabriel | 0 | ARU | F | −2B | =13N | +7B | =12N | +15B | −4N | 3.0 | 27.0 | 27.0 | 12.50 | 1258 | 0.0 |
| 18 | FIDE 28567897 | 0 | — | −2N | −?N | +21B | +?B | −14N | +20B | −13N | 3.0 | 19.5 | 19.5 | 6.00 | 672 | 0.0 |
| 19 | FIDE 15902072 | 0 | — | +?B | −9N | +29B | −3N | −16B | +?N | −5N | 3.0 | 18.0 | 18.0 | 1.00 | 792 | 0.0 |
| 20 | FIDE 15902102 | 0 | — | +29B | −4N | −16B | −28N | +?B | −18N | +?B | 3.0 | 14.0 | 14.0 | 1.00 | 1536 | 0.0 |
| 21 | FIDE 15902110 | 0 | — | −15N | −24B | −18N | =26B | +27N | =?N | +?B | 3.0 | 13.5 | 13.5 | 3.00 | 1450 | 0.0 |
| 22 | Pourier, Dianthely | 1502 | AHO | F | +15B | +4N | =1B | −2N | −10N | −7B | 2.5 | 29.0 | 29.0 | 12.00 | 1509 | -1.2 |
| 23 | Koolman, Colin Kyle Deniel | 1528 | ARU | +25B | F | −10B | +16N | =5N | −11B | −6N | 2.5 | 22.5 | 22.5 | 7.75 | 828 | -30.0 |
| 24 | Motwani, Grayce | 0 | ARU | −12B | +21N | +?B | −9N | =?B | −7N | −15N | 2.5 | 19.5 | 19.5 | 3.00 | 747 | 0.0 |
| 25 | FIDE 15901998 | 0 | — | −23N | F | F | −4B | +28N | +14B | −11N | 2.0 | 17.0 | 17.0 | 5.50 | 1332 | 0.0 |
| 26 | FIDE 15901602 | 0 | — | −1B | −?N | =?B | =21N | F | +28B | −14N | 2.0 | 14.5 | 14.5 | 3.00 | 673 | 0.0 |
| 27 | FIDE 15901904 | 0 | — | −3B | −29N | −15N | =?B | −21B | +?N | =28N | 2.0 | 14.5 | 14.5 | 0.75 | 771 | 0.0 |
| 28 | FIDE 15902080 | 0 | — | −14N | −?N | F | +20B | −25B | −26N | =27B | 1.5 | 13.0 | 13.0 | 4.00 | 653 | 0.0 |
| 29 | Rico, Zayra | 0 | AHO | −20N | +27B | −19N | −14N | −7B | F | −?B | 1.0 | 16.5 | 16.5 | 2.00 | 652 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Gajadien, VashistSUR+84.86.0 pts · #1
- 2Cabral, SylviARU+73.25.5 pts · #3
- 3Karamchandani, PiyushARU+17.24.0 pts · #9
- 1Ayubi, AmirAHO-33.65.0 pts · #11
- 2Wu, Jie-PengAHO-32.84.0 pts · #6
- 3Vergara Rivera, Juan SebastiaanARU-32.84.0 pts · #2
- R5+242 Elo gap
- R3+198 Elo gap
- R3+122 Elo gap