2025 Seattle Chess Classic - Seirawan U1600
Open SwissStandard
27 players participated in this 6-round tournament, held from 16 Aug 2025 to 17 Aug 2025 in Bellevue, WA, United States. 3 federations represented. Top 10 Elo average was 453, and top seed was Oliver Wakeman (🇺🇸 USA, 1596).
Riaan Babbar (🇺🇸 USA, 0) won with 5.0/6. Babbar clinched sole first place in the final round.
The biggest upset came in round 6: N Inura Sanumitha Wijayarathna (1419) beat Sambuddha Sekhar Das (1565), a +146-point gap.
Location
🇺🇸Bellevue, WA, United States
Dates
16 Aug 2025 → 17 Aug 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss · 6 rounds
Avg top 10
453
Participants
27
Federations · 3 represented
🇺🇸United States of America×16
FIDE (no federation)×1
🇱🇰Sri Lanka×1
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 6 roundsRiaan Babbar led from R6; +0.5-point edge over the runner-up.
Co-leaders
16
6
2
1
1
1
R6 · LEADER CHANGE17 Aug
Riaan Babbar takes the sole lead (5.0/6).
R1–R4 · WIN STREAK
FIDE 39941256 won 4 in a row (R1–R4).
R4 · LATE SURGE
N Inura Sanumitha Wijayarathna was #13 at R4, climbed to #1 over the final stretch.
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Riaan Babbar | * | — | 1 | — |
| 2FIDE 39941256 | — | * | — | 1 |
| 3N Inura Sanumitha Wijayarathna | 0 | — | * | — |
| 4Aiden Zhu | — | 0 | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Babbar, Riaan | 0 | USA | +?N | =6B | +3N | =10B | +?N | +4B | 5.0 | 15.5 | 15.5 | 11.75 | 1439 | 0.0 |
| 2 | FIDE 39941256 | 0 | — | +16B | +5N | +?B | +9N | =?B | F | 4.5 | 10.5 | 10.5 | 10.50 | 1566 | 0.0 |
| 3 | Wijayarathna, N Inura Sanumitha | 1419 | SRI | +27N | =8N | −1B | +24B | =20N | +13B | 4.0 | 15.5 | 15.5 | 7.25 | 1749 | +34.8 |
| 4 | Avula, Guru Harshith | 0 | USA | +?B | −9N | +?B | +?N | +11B | −1N | 4.0 | 12.0 | 12.0 | 3.50 | 1566 | 0.0 |
| 5 | Zhu, Aiden | 0 | USA | +?N | −2B | +?N | F | +8B | +9N | 4.0 | 11.5 | 11.5 | 7.00 | 1567 | 0.0 |
| 6 | FIDE 39990656 | 0 | — | +?N | =1N | +21B | =13B | =?N | =?B | 4.0 | 11.0 | 11.0 | 7.00 | 1547 | 0.0 |
| 7 | FIDE 39989739 | 0 | — | F | +?N | +16B | +?B | +13N | −?B | 4.0 | 6.0 | 6.0 | 6.00 | 1547 | 0.0 |
| 8 | Cheng, Alan | 1547 | USA | +14N | =3B | −10N | +12B | −5N | +23B | 3.5 | 18.0 | 20.0 | 10.50 | 1419 | -6.8 |
| 9 | Hetamsaria, Aayan | 0 | FID | +?N | +4B | +?N | −2B | =10N | −5B | 3.5 | 16.0 | 16.0 | 5.75 | 1548 | 0.0 |
| 10 | Zhao, Raymond Rubao | 0 | USA | +15B | =?N | +8B | =1N | =9B | −?N | 3.5 | 15.0 | 15.0 | 10.75 | 1567 | 0.0 |
| 11 | Roy Chowdhury, Avyaan | 0 | USA | +?N | +?B | =13N | =?B | −4N | =12B | 3.5 | 10.5 | 10.5 | 3.25 | 1565 | 0.0 |
| 12 | Chaudhuri, Arihant | 0 | USA | −?B | +?N | +?B | −8N | +15B | =11N | 3.5 | 10.0 | 10.0 | 4.75 | 747 | 0.0 |
| 13 | Das, Sambuddha Sekhar | 1565 | USA | +18B | +17N | =11B | =6N | −7B | −3N | 3.0 | 18.5 | 21.5 | 9.75 | 619 | -28.0 |
| 14 | FIDE 39987531 | 0 | — | −8B | −15N | +?B | +16N | +21B | −?N | 3.0 | 12.5 | 12.5 | 6.00 | 747 | 0.0 |
| 15 | FIDE 39987540 | 0 | — | −10N | +14B | +23N | −?B | −12N | +?B | 3.0 | 12.0 | 12.0 | 5.00 | 728 | 0.0 |
| 16 | Arunkumar, Pragit | 0 | USA | −2N | +26B | −7N | −14B | +?N | +?B | 3.0 | 11.5 | 11.5 | 0.00 | 1616 | 0.0 |
| 17 | Ma, Ziliang | 0 | USA | +26N | −13B | −19N | +?B | +?N | −20B | 3.0 | 9.0 | 9.0 | 0.00 | 765 | 0.0 |
| 18 | Tare, Eevie | 0 | USA | −13N | −?B | +?N | +23B | −19B | +?N | 3.0 | 8.0 | 8.0 | 2.00 | 1581 | 0.0 |
| 19 | Avula, Varshith | 0 | USA | =25B | =24N | +17B | −?B | +18N | −?N | 3.0 | 7.5 | 7.5 | 6.75 | 746 | 0.0 |
| 20 | Thanikonda, Kruti | 0 | USA | =?B | F | F | +?N | =3B | +17N | 3.0 | 7.0 | 7.0 | 5.00 | 1419 | 0.0 |
| 21 | Li, Edgar | 0 | USA | +?N | −?B | −6N | +?B | −14N | +?B | 3.0 | 7.0 | 7.0 | 0.00 | 728 | 0.0 |
| 22 | Zhang, Patrick | 0 | USA | −?N | +?B | −?N | +?B | −?B | +?N | 3.0 | 0.0 | 0.0 | 0.00 | 1432 | 0.0 |
| 23 | Ren, Easton | 0 | USA | +?N | −?N | −15B | −18N | +26B | −8N | 2.0 | 9.5 | 9.5 | 0.00 | 1438 | 0.0 |
| 24 | FIDE 39987400 | 0 | — | =?N | =19B | F | −3N | −?B | −?N | 1.0 | 7.0 | 7.0 | 1.50 | 619 | 0.0 |
| 25 | FIDE 39991318 | 0 | — | =19N | −?B | −?N | −?B | −?N | F | 0.5 | 3.0 | 3.0 | 1.50 | 796 | 0.0 |
| 26 | FIDE 39991300 | 0 | — | −17B | −16N | −?B | F | −23N | −?B | 0.0 | 8.0 | 8.0 | 0.00 | 796 | 0.0 |
| 27 | FIDE 39991253 | 0 | — | −3B | F | F | F | F | F | 0.0 | 4.0 | 4.0 | 0.00 | 619 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Wijayarathna, N Inura SanumithaSRI+34.84.0 pts · #1
- 2Zhao, Raymond RubaoUSA0.03.5 pts · #2
- 3FIDE 399412560.04.5 pts · #4
Top rating losers
- 1Das, Sambuddha SekharUSA-28.03.0 pts · #17
- 2Cheng, AlanUSA-6.83.5 pts · #14
- 3Zhao, Raymond RubaoUSA0.03.5 pts · #2
Biggest upsets
- R6+146 Elo gap