2025 Chess4win October 25-26 Markham Open U1900
35 players participated in this 5-round tournament, held from 25 Oct 2025 to 26 Oct 2025 in Markham, ON, Canada. 3 federations represented. Top 10 Elo average was 1673, and top seed was Lyam Katz (🇨🇦 CAN, 1747).
Shannon Zhao (🇨🇦 CAN, 1726) won with 5.0/5, ahead of Arianna Yuan (4.0) and Bennett Peng (4.0). Zhao broke clear in the final round.
The biggest upset came in round 4: Sanya Divadalage (1482) beat Rex Tan (1686), a +204-point gap.
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How it unfolded
Top 6 · 5 roundsShannon Zhao led from R5; +1.0-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R5.
Shannon Zhao never relinquished the lead after R5; final gap +1.0 over the runner-up.
Shannon Zhao beat Arianna Yuan (Black).
Shannon Zhao 5 wins (R1–R5)Arianna Yuan 3 wins (R1–R3)Bennett Peng 4 wins (R1–R4)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Shannon Zhao | * | 1 | 1 | — |
| 2Arianna Yuan | 0 | * | — | 1 |
| 3Bennett Peng | 0 | — | * | — |
| 4Stephen Papadatos | — | 0 | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Zhao, Shannon | 1726 | CAN | +24B | +7N | +6B | +2N | +3B | 5.0 | 14.0 | 15.5 | 15.50 | 2318 | +35.7 |
| 2 | Yuan, Arianna | 1507 | CAN | +11N | +4B | +14N | −1B | +12N | 4.0 | 15.0 | 17.5 | 12.50 | 1862 | +90.8 |
| 3 | Peng, Bennett | 0 | CAN | +30B | +34N | +5B | +8N | −1N | 4.0 | 12.5 | 12.5 | 7.50 | 1664 | 0.0 |
| 4 | Papadatos, Stephen | 1562 | CAN | +10B | −2N | +21B | +22N | +6B | 4.0 | 12.0 | 14.0 | 10.00 | 1666 | +16.4 |
| 5 | Gowrishankar, Nilaanujan | 1611 | CAN | +32N | +19B | −3N | =16B | +29N | 3.5 | 10.0 | 11.0 | 5.75 | 1962 | +52.8 |
| 6 | Jia, Jasper Yunjie | 1529 | CAN | +15N | +25B | −1N | +9B | −4N | 3.0 | 14.5 | 16.0 | 7.00 | 1490 | -6.4 |
| 7 | Divadalage, Sanya | 1482 | CAN | +12N | −1B | F | +17N | +18B | 3.0 | 13.0 | 13.0 | 8.00 | 1869 | +79.2 |
| 8 | Huang, Frankie | 1630 | CAN | +31N | =9B | +19N | −3B | =16N | 3.0 | 11.5 | 12.5 | 5.75 | 1899 | +39.2 |
| 9 | Xie, Ethan | 0 | CAN | +18B | =8N | =20B | −6N | +21B | 3.0 | 10.5 | 12.5 | 7.00 | 1635 | 0.0 |
| 10 | Kutuzyan, James | 0 | CAN | −4N | −15B | +31N | +19B | +32B | 3.0 | 9.5 | 10.5 | 4.00 | 1624 | 0.0 |
| 11 | Desikan, Ajith | 1645 | CAN | −2B | +30N | F | +24B | +14N | 3.0 | 9.0 | 9.0 | 5.00 | 1728 | +8.0 |
| 12 | Gao, Yiguo | 1620 | CAN | −7B | +35N | +34B | +20N | −2B | 3.0 | 9.0 | 9.0 | 2.00 | 1424 | -31.2 |
| 13 | Donmez, Alphan | 1422 | TUR | −14N | −20N | +30B | +25B | +15N | 3.0 | 8.5 | 9.5 | 5.00 | 1574 | +31.6 |
| 14 | Wang, Alan | 1562 | CAN | +13B | =16N | −2B | +26N | −11B | 2.5 | 12.5 | 14.0 | 5.75 | 1464 | -21.2 |
| 15 | Liu, Ziyang Robin | 0 | CAN | −6B | +10N | =17B | +28N | −13B | 2.5 | 11.5 | 13.0 | 5.75 | 1462 | 0.0 |
| 16 | Ugodnikov, Arkadiy | 1628 | CAN | +23N | =14B | F | =5N | =8B | 2.5 | 11.0 | 11.0 | 6.50 | 1675 | +4.4 |
| 17 | Tan, Rex | 1686 | CAN | −25N | +23B | =15N | −7B | +26N | 2.5 | 9.0 | 10.5 | 4.75 | 1397 | -46.0 |
| 18 | Ting, Ryan | 1676 | CAN | −9N | +26B | +27N | =29B | −7N | 2.5 | 9.0 | 10.5 | 3.75 | 1396 | -28.8 |
| 19 | Katz, Lyam | 1747 | CAN | +21B | −5N | −8B | −10N | +31B | 2.0 | 11.5 | 12.5 | 3.00 | 1583 | -17.2 |
| 20 | Miaco, Trifelino T | 1645 | USA | =26N | +13B | =9N | −12B | F | 2.0 | 10.5 | 10.5 | 5.25 | 1521 | -6.8 |
| 21 | Merse, Leon Noel | 1589 | CAN | −19N | +31B | −4N | +34B | −9N | 2.0 | 10.0 | 10.0 | 1.00 | 1479 | -18.0 |
| 22 | Moshopoulos, Angelos | 0 | CAN | +28N | +27B | F | −4B | F | 2.0 | 7.0 | 7.0 | 3.00 | 1560 | 0.0 |
| 23 | Yang, Andrew | 1521 | CAN | −16B | −17N | =33B | =30N | +34N | 2.0 | 7.0 | 7.0 | 1.00 | 1428 | -18.0 |
| 24 | Divadalage, Sanul | 1505 | CAN | −1N | +32B | F | −11N | =28B | 1.5 | 10.5 | 10.5 | 1.75 | 1370 | -25.2 |
| 25 | Li, Alyssa Zhuojing | 1555 | CAN | +17B | −6N | −26B | −13N | =27N | 1.5 | 10.0 | 11.5 | 3.25 | 1421 | -22.0 |
| 26 | Maulvi, Mohammedfaizal Gulammustu | 0 | CAN | =20B | −18N | +25N | −14B | −17B | 1.5 | 9.5 | 11.0 | 2.50 | 1477 | 0.0 |
| 27 | Rosenberg, Sean | 0 | CAN | +33B | −22N | −18B | −32N | =25B | 1.5 | 7.0 | 8.0 | 1.75 | 1624 | 0.0 |
| 28 | Shen, Yuntian(denis) | 1556 | CAN | −22B | +33N | F | −15B | =24N | 1.5 | 7.0 | 7.0 | 1.75 | 1789 | +24.4 |
| 29 | Kotapuri, Ruslan | 1692 | CAN | +35B | F | F | =18N | −5B | 1.5 | 6.0 | 6.0 | 1.25 | 1450 | -25.2 |
| 30 | Ganeshanathan, Sayan | 1526 | CAN | −3N | −11B | −13N | =23B | =33N | 1.0 | 12.0 | 13.0 | 1.50 | 1365 | -33.2 |
| 31 | Sahni, Anagh | 1509 | CAN | −8B | −21N | −10B | +33N | −19N | 1.0 | 10.0 | 11.0 | 1.00 | 1460 | -8.0 |
| 32 | Gao, Joe | 0 | CAN | −5B | −24N | F | +27B | −10N | 1.0 | 9.5 | 9.5 | 1.50 | 781 | 0.0 |
| 33 | Cao, Allen | 1650 | CAN | −27N | −28B | =23N | −31B | =30B | 1.0 | 6.0 | 7.0 | 1.50 | 1333 | -65.6 |
| 34 | Hu, Ethan | 0 | CAN | F | −3B | −12N | −21N | −23B | 0.0 | 11.0 | 11.0 | 0.00 | 776 | 0.0 |
| 35 | FIDE 2681048 | 0 | — | −29N | −12B | F | F | F | 0.0 | 4.5 | 4.5 | 0.00 | 855 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Yuan, AriannaCAN+90.84.0 pts · #1
- 2Divadalage, SanyaCAN+79.23.0 pts · #3
- 3Gowrishankar, NilaanujanCAN+52.83.5 pts · #7
- 1Cao, AllenCAN-65.61.0 pts · #19
- 2Tan, RexCAN-46.02.5 pts · #29
- 3Ganeshanathan, SayanCAN-33.21.0 pts · #25
- R4+204 Elo gap
- R5+194 Elo gap
- R4+141 Elo gap