2025 CalChess State Open & Class FIDE Championship - AB
Open SwissStandard
86 players participated in this 7-round tournament, held from 29 Aug 2025 to 01 Sept 2025 in Cupertino, CA, United States. 7 federations represented. Top 10 Elo average was 1834, and top seed was Matthew Zhang (🇺🇸 USA, 1920).
Albert Ziatdinov (🇷🇺 RUS, 1839) won with 6.0/7, ahead of Rudy Jr. Tia (5.5) and Xiaoshan Chen (5.0). Ziatdinov shared the lead from round 5 and won solo starting round 6.
The biggest upset came in round 5: Angela Zixi Wang (1631) beat Matthew Zhang (1920), a +289-point gap.
Location
🇺🇸Cupertino, CA, United States
Dates
29 Aug 2025 → 01 Sept 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss · 7 rounds
Federations · 7 represented
🇺🇸United States of America×78
🇮🇳India×3
FIDE (no federation)×1
🇵🇬Papua New Guinea×1
🇲🇽Mexico×1
🇨🇦Canada×1
🇷🇺Russia×1
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 7 roundsAlbert Ziatdinov led from R6; +0.5-point edge over the runner-up.
Co-leaders
19
6
3
1
2
1
1
R6 · LEADER CHANGE01 Sept
Albert Ziatdinov takes the sole lead (5.5/6).
R6 · HEAD-TO-HEAD · WINNER VS 2ND
Albert Ziatdinov beat Rudy Jr. Tia (White).
WIN STREAKS · 2 top finishers
Albert Ziatdinov 5 wins (R2–R6)Rudy Jr. Tia 4 wins (R1–R4)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Albert Ziatdinov | * | 1 | — | — |
| 2Rudy Jr. Tia | 0 | * | — | — |
| 3Xiaoshan Chen | — | — | * | — |
| 4Avik Saha | — | — | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Ziatdinov, Albert | 1839 | RUS | =17N | +30B | +73B | +34N | +29N | +2B | =56B | 6.0 | 21.5 | 22.5 | 19.50 | 2032 | +59.2 |
| 2 | Tia, Rudy Jr. | 1748 | PNG | +35B | +31N | +9B | +26N | =56B | −1N | +67B | 5.5 | 22.5 | 24.0 | 17.00 | 1902 | +23.6 |
| 3 | Chen, Xiaoshan | 1827 | USA | +13N | +40B | −29N | +22B | =67N | +10B | =4N | 5.0 | 24.5 | 26.0 | 19.25 | 1856 | +13.2 |
| 4 | Pu, Hugo | 1534 | USA | +49N | =8B | =14B | +18N | =75B | +26N | =3B | 5.0 | 24.0 | 25.0 | 17.50 | 1824 | +91.2 |
| 5 | Saha, Avik | 1656 | USA | +76N | =55B | +17N | =29B | +38B | −11N | +75B | 5.0 | 18.0 | 19.0 | 11.75 | 1906 | +76.4 |
| 6 | Sane, Shreyus | 1669 | USA | =16N | +15B | +42N | F | +14B | =53B | =8N | 4.5 | 23.0 | 23.0 | 17.50 | 1963 | +91.2 |
| 7 | Viswanath, Avyukth Ganapathy | 1698 | USA | +12B | −9N | +43B | −46N | =19B | +40N | +37B | 4.5 | 22.0 | 25.0 | 15.50 | 1804 | +31.2 |
| 8 | Verma, Vedant | 1717 | USA | +44B | =4N | +37B | =10B | +68N | −56N | =6B | 4.5 | 22.0 | 23.5 | 14.50 | 1736 | +7.6 |
| 9 | Zhu, Stephen | 0 | USA | +60N | +7B | −2N | +36B | −53N | +69B | =22N | 4.5 | 21.5 | 23.0 | 13.00 | 1686 | 0.0 |
| 10 | Liu, Serena | 1681 | USA | =48N | +51B | +66B | =8N | =26B | −3N | +30B | 4.5 | 21.5 | 23.0 | 12.75 | 1777 | +30.4 |
| 11 | Clemens, Kristian | 1870 | USA | +21N | =20B | +24N | F | +12B | +5B | F | 4.5 | 21.5 | 21.5 | 19.50 | 2000 | +11.4 |
| 12 | Naga Abhi Ram Ponnaluri | 1565 | USA | −7N | +58B | +27N | +54B | −11N | +55B | =13N | 4.5 | 21.0 | 23.0 | 11.75 | 1717 | +38.4 |
| 13 | Luo, Aaron Yuanjie | 1768 | USA | −3B | =33N | +74B | +48N | +27B | =75N | =12B | 4.5 | 19.5 | 20.5 | 11.25 | 1597 | -37.6 |
| 14 | Brongersma, Hayden Scott | 1758 | USA | =82N | +39B | =4N | +35B | −6N | +72B | =68N | 4.5 | 18.5 | 19.0 | 11.00 | 1710 | -12.4 |
| 15 | Ho, Michael | 1751 | USA | =52B | −6N | +65B | =55N | +51B | =30N | +39B | 4.5 | 18.0 | 19.5 | 11.00 | 1656 | -11.6 |
| 16 | Zhang, Matthew | 1920 | USA | =6B | +52N | −34B | +44N | −39B | =23N | +27B | 4.0 | 21.0 | 23.5 | 13.25 | 1564 | -86.8 |
| 17 | Sartorio, David | 1660 | USA | =1B | +57N | −5B | +33N | =81B | =34N | =61B | 4.0 | 21.0 | 21.5 | 10.75 | 1751 | +30.8 |
| 18 | Tran, Toby | 1632 | USA | =47N | +82B | =20N | −4B | +54N | =36B | =21N | 4.0 | 21.0 | 21.5 | 9.50 | 1626 | +3.6 |
| 19 | Brahmanapally, Sarvagnya | 1609 | USA | +50N | −26B | −54N | +32B | =7N | +48B | =36N | 4.0 | 19.5 | 21.5 | 12.25 | 1530 | -22.4 |
| 20 | Bhosale, Arnav | 1772 | USA | +74B | =11N | =18B | −38N | =28B | +65N | =62B | 4.0 | 18.5 | 19.5 | 9.50 | 1576 | -51.6 |
| 21 | Vuluvala, Ritvik | 1604 | FID | −11B | =74N | +41B | +66N | =34B | =61N | =18B | 4.0 | 18.0 | 19.0 | 9.50 | 1738 | +35.6 |
| 22 | Huang, Si Hao | 1649 | USA | F | +28N | =38B | −3N | +86B | +81N | =9B | 4.0 | 16.5 | 16.5 | 7.75 | 1827 | +47.2 |
| 23 | Bogi, Yudhin | 1646 | USA | −55N | =41B | =59N | =65B | +83N | =16B | +33N | 4.0 | 15.5 | 16.0 | 8.75 | 1846 | +30.4 |
| 24 | Seidel, Eli | 1575 | USA | =28B | +64N | −11B | =51N | −62B | +76N | +81B | 4.0 | 15.0 | 15.5 | 6.00 | 1657 | +30.0 |
| 25 | Navaneetha Prabhu, Arjunsai | 1624 | USA | −27N | −54B | =50N | +74B | +66B | =28N | +70B | 4.0 | 14.5 | 15.5 | 7.00 | 1596 | -6.4 |
| 26 | Cheng, Kar Lun | 1648 | USA | +45B | +19N | +46B | −2B | =10N | −4B | F | 3.5 | 25.0 | 25.0 | 12.25 | 1687 | +7.2 |
| 27 | Somashekar, Jayant | 0 | USA | +25B | =73N | −12B | +37N | −13N | +42B | −16N | 3.5 | 23.0 | 24.0 | 10.50 | 1681 | 0.0 |
| 28 | Rangamreddy, Aashvi Sri | 1617 | USA | =24N | −22B | +78N | =40B | =20N | =25B | =44N | 3.5 | 22.0 | 23.0 | 10.00 | 1647 | +11.2 |
| 29 | Gongora Zermeno, Rogelio Aram | 1914 | MEX | +36B | +43N | +3B | =5N | −1B | F | F | 3.5 | 22.0 | 22.0 | 13.50 | 1828 | -7.0 |
| 30 | Parhar, Ojas | 1543 | USA | =38B | −1N | +64B | +73N | =69N | =15B | −10N | 3.5 | 21.0 | 22.0 | 7.00 | 1677 | +49.2 |
| 31 | Nishtala, Vasisht | 1558 | USA | +41N | −2B | −36N | =49B | =33N | +64B | =32N | 3.5 | 20.5 | 22.0 | 9.00 | 1617 | +15.6 |
| 32 | Roumpos, Georgios | 0 | USA | −43B | +45N | −35B | −19N | +41B | +54N | =31B | 3.5 | 19.5 | 21.5 | 9.75 | 1585 | 0.0 |
| 33 | Saha, Ritwik | 1712 | USA | −46N | =13B | +47N | −17B | =31B | +35N | −23B | 3.0 | 22.0 | 25.0 | 10.00 | 1609 | -40.0 |
| 34 | Jain, Ishaan | 1708 | USA | F | =42B | +16N | −1B | =21N | =17B | =80N | 3.0 | 22.0 | 22.0 | 10.00 | 1725 | +4.8 |
| 35 | Nalakonda, Anish | 1624 | USA | −2N | +50B | +32N | −14N | −61B | −33B | +64N | 3.0 | 21.0 | 22.5 | 7.50 | 1585 | -12.8 |
| 36 | Raghav, Surya | 1496 | USA | −29N | F | +31B | −9N | +71B | =18N | =19B | 3.0 | 21.0 | 21.0 | 9.00 | 1670 | +32.8 |
| 37 | Mo, Kayden Pak | 1601 | USA | F | +48B | −8N | −27B | +49N | +50B | −7N | 3.0 | 20.0 | 20.0 | 7.50 | 1503 | -16.0 |
| 38 | Peterson, Jared E | 1665 | USA | =30N | +47B | =22N | +20B | −5N | F | F | 3.0 | 19.5 | 19.5 | 10.75 | 1726 | +17.2 |
| 39 | Wang, Angela Zixi | 1631 | USA | F | −14N | +57B | +42B | +16N | −67B | −15N | 3.0 | 19.5 | 19.5 | 9.00 | 1745 | +34.4 |
| 40 | Subramaniam, Sanushya | 1610 | USA | +77B | −3N | =44B | =28N | F | −7B | +49N | 3.0 | 19.5 | 19.5 | 6.75 | 1440 | -26.4 |
| 41 | Gutta, Anirudh | 1532 | USA | −31B | =23N | −21N | =58B | −32N | +83B | +73B | 3.0 | 18.0 | 18.5 | 4.50 | 1526 | -1.6 |
| 42 | Garbouz, Igor | 1656 | USA | +54B | =34N | −6B | −39N | =76B | −27N | +65B | 3.0 | 17.5 | 18.5 | 5.50 | 1578 | -21.6 |
| 43 | Bharadwaj, Samarth Ram | 1558 | USA | +32N | −29B | −7N | −59B | F | +66N | +50B | 3.0 | 17.5 | 17.5 | 7.50 | 1672 | +20.8 |
| 44 | Karthikeyan, Mahesh N | 0 | USA | −8N | +49B | =40N | −16B | F | +84N | =28B | 3.0 | 17.5 | 17.5 | 5.75 | 1526 | 0.0 |
| 45 | Soltani, Mohammad | 1507 | USA | −26N | −32B | −49N | F | +58N | +59B | +55N | 3.0 | 15.5 | 15.5 | 6.00 | 1600 | +5.0 |
| 46 | Karamali, Saiya | 1697 | USA | +33B | +65N | −26N | +7B | F | F | −53N | 3.0 | 15.0 | 15.0 | 9.00 | 1718 | +2.2 |
| 47 | Pang, Elena Hingyip | 1650 | USA | =18B | −38N | −33B | =57N | +79B | −71N | +84B | 3.0 | 14.5 | 14.5 | 4.00 | 1472 | -37.2 |
| 48 | Mythil, Arnav | 1669 | USA | =10B | −37N | +52B | −13B | +82N | −19N | −63B | 2.5 | 20.5 | 21.0 | 5.25 | 1446 | -69.2 |
| 49 | Ravikiran, Aadhitya | 0 | USA | −4B | −44N | +45B | =31N | −37B | +85N | −40B | 2.5 | 20.5 | 20.5 | 4.75 | 1536 | 0.0 |
| 50 | Bankuru, Sudhiksha | 1467 | USA | −19B | −35N | =25B | +77N | +73B | −37N | −43N | 2.5 | 18.0 | 19.0 | 4.00 | 1417 | -14.4 |
| 51 | Ni, Tao | 1569 | USA | F | −10N | +77B | =24B | −15N | −70N | +57B | 2.5 | 17.5 | 17.5 | 5.00 | 1582 | +0.6 |
| 52 | Ikshit Gupta | 1507 | IND | =15N | −16B | −48N | =64B | =70B | =73N | =76B | 2.5 | 15.0 | 16.0 | 4.75 | 1612 | +22.0 |
| 53 | Patel, Anuj | 1813 | USA | F | F | F | F | +9B | =6N | +46B | 2.5 | 12.0 | 12.0 | 9.75 | 1876 | +3.0 |
| 54 | Turaga, Varun Karthik | 1701 | USA | −42N | +25N | +19B | −12N | −18B | −32B | F | 2.0 | 23.0 | 23.0 | 8.00 | 1543 | -43.2 |
| 55 | Liu, Kaihan | 1502 | USA | +23B | =5N | F | =15B | F | −12N | −45B | 2.0 | 21.0 | 21.0 | 8.75 | 1554 | +12.8 |
| 56 | Jatin S N | 1862 | IND | F | F | F | F | =2N | +8B | =1N | 2.0 | 16.0 | 16.0 | 10.25 | 1893 | +2.4 |
| 57 | Chen, Felix Y | 1667 | USA | =78N | −17B | −39N | =47B | −64N | +74B | −51N | 2.0 | 15.0 | 16.0 | 3.00 | 1350 | -94.4 |
| 58 | Gupta, Shanaya | 1553 | USA | F | −12N | −60B | =41N | −45B | =79N | +85B | 2.0 | 13.5 | 13.5 | 2.00 | 1425 | -34.4 |
| 59 | Aetukuri, Gautam Chowdary | 0 | USA | F | =77N | =23B | +43N | −60B | −45N | F | 2.0 | 13.0 | 13.0 | 5.50 | 1476 | 0.0 |
| 60 | Jiang, Richard | 1537 | USA | −9B | F | +58N | F | +59N | −68B | −69N | 2.0 | 11.5 | 11.5 | 4.00 | 1493 | -6.8 |
| 61 | Sangal Lopez, Dev | 0 | USA | F | F | F | F | +35N | =21B | =17N | 2.0 | 11.0 | 11.0 | 7.00 | 1651 | 0.0 |
| 62 | Lee, Shan Ramesh | 1482 | USA | F | F | F | F | +24N | =80B | =20N | 2.0 | 9.0 | 9.0 | 6.50 | 1797 | +48.8 |
| 63 | Liu, Travis M | 1666 | USA | F | F | F | F | F | +78B | +48N | 2.0 | 3.5 | 3.5 | 3.50 | 2432 | +18.0 |
| 64 | Wang, Ayden | 1596 | USA | F | −24B | −30N | =52N | +57B | −31N | −35B | 1.5 | 18.5 | 18.5 | 3.25 | 1387 | -65.2 |
| 65 | Saligram, Ayaan | 0 | USA | F | −46B | −15N | =23N | +85B | −20B | −42N | 1.5 | 18.5 | 18.5 | 2.00 | 1516 | 0.0 |
| 66 | Wang, Elvin | 1607 | USA | F | +78B | −10N | −21B | −25N | −43B | =79N | 1.5 | 17.5 | 17.5 | 1.50 | 1380 | -56.8 |
| 67 | Grigorev, Mikhail | 1714 | USA | F | F | F | F | =3B | +39N | −2N | 1.5 | 13.5 | 13.5 | 5.50 | 1736 | +4.0 |
| 68 | Yuen, Toma | 1727 | CAN | F | F | F | F | −8B | +60N | =14B | 1.5 | 11.0 | 11.0 | 4.25 | 1671 | -8.4 |
| 69 | Shankar, Pranav | 1573 | USA | F | F | F | F | =30B | −9N | +60B | 1.5 | 10.0 | 10.0 | 3.75 | 1733 | +15.6 |
| 70 | Mouleesha, Neel | 0 | USA | F | F | F | F | =52N | +51B | −25N | 1.5 | 9.0 | 9.0 | 3.75 | 1568 | 0.0 |
| 71 | Sharma, Shivam Saran | 0 | USA | F | F | F | F | −36N | +47B | =72N | 1.5 | 7.5 | 7.5 | 3.75 | 1574 | 0.0 |
| 72 | Garg, Ishan | 1601 | USA | F | F | F | F | +84B | −14N | =71B | 1.5 | 6.0 | 6.0 | 0.75 | 960 | -11.6 |
| 73 | Fergerson, Ray | 1627 | USA | F | =27B | −1N | −30B | −50N | =52B | −41N | 1.0 | 21.0 | 21.0 | 3.00 | 1211 | -94.0 |
| 74 | Jonnalagada, Navaneet Vishnusai | 1657 | USA | −20N | =21B | −13N | −25N | =77B | −57N | F | 1.0 | 19.5 | 19.5 | 2.50 | 1321 | -72.0 |
| 75 | Shrivastava, Ansh | 1642 | USA | F | F | F | F | =4N | =13B | −5N | 1.0 | 14.5 | 14.5 | 4.75 | 1527 | -16.0 |
| 76 | Lau, Marcus | 1541 | USA | −5B | F | F | F | =42N | −24B | =52N | 1.0 | 14.5 | 14.5 | 2.75 | 1406 | -27.2 |
| 77 | Yu, Andrew | 1636 | USA | −40N | =59B | −51N | −50B | =74N | F | F | 1.0 | 11.0 | 11.0 | 1.50 | 755 | -72.8 |
| 78 | Torney, Milind | 1631 | USA | =57B | −66N | −28B | F | F | −63N | =83N | 1.0 | 9.5 | 9.5 | 1.25 | 1316 | -58.4 |
| 79 | Balasubramanian, Pranav Sairohit | 0 | USA | F | F | F | F | −47N | =58B | =66B | 1.0 | 6.5 | 6.5 | 1.75 | 1478 | 0.0 |
| 80 | Jin, Fan | 1669 | USA | F | F | F | F | F | =62N | =34B | 1.0 | 5.0 | 5.0 | 2.50 | 1595 | -7.6 |
| 81 | Hou, Calvin | 1589 | USA | F | F | F | F | =17N | −22B | −24N | 0.5 | 12.0 | 12.0 | 2.00 | 1355 | -32.8 |
| 82 | Maparara, Anthony | 0 | USA | =14B | −18N | F | F | −48B | F | F | 0.5 | 11.0 | 11.0 | 2.25 | 1494 | 0.0 |
| 83 | Lee, Angelina R | 0 | USA | F | F | F | F | −23B | −41N | =78B | 0.5 | 8.0 | 8.0 | 0.50 | 1331 | 0.0 |
| 84 | Ng, Preston | 0 | USA | F | F | F | F | −72N | −44B | −47N | 0.0 | 7.5 | 7.5 | 0.00 | 851 | 0.0 |
| 85 | Venkatagiri Acharya | 1729 | IND | F | F | F | F | −65N | −49B | −58N | 0.0 | 6.0 | 6.0 | 0.00 | 752 | -14.6 |
| 86 | Kaplan, Glenn | 1701 | USA | F | F | F | F | −22N | F | F | 0.0 | 4.0 | 4.0 | 0.00 | 850 | -11.4 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Sane, ShreyusUSA+91.24.5 pts · #7
- 2Pu, HugoUSA+91.25.0 pts · #9
- 3Saha, AvikUSA+76.45.0 pts · #4
Top rating losers
- 1Chen, Felix YUSA-94.42.0 pts · #74
- 2Fergerson, RayUSA-94.01.0 pts · #75
- 3Zhang, MatthewUSA-86.84.0 pts · #41
Biggest upsets
- R5+289 Elo gap
- R3+212 Elo gap
- R7+176 Elo gap