2025 Chicago Summer Open - U2100
41 players participated in this 5-round tournament, held from 20 Jun 2025 to 22 Jun 2025 in Schaumburg, IL, United States. 2 titled players from 2 federations. Top 10 Elo average was 1869, and top seed was Josiah Stein (🇺🇸 USA, 1960).
Davganamdag Tugsbilguun (🇲🇳 MGL, 1952) won with 3.5/5, ahead of Vaibhav Kailash (3.5) and Anish Suddala (3.5). Tugsbilguun shared the lead from round 1, winning on tie-break.
The biggest upset came in round 5: Sebastian Lee (1774) beat Josiah Stein (1960), a +186-point gap.
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How it unfolded
Top 6 · 5 roundsTight race until R5; 3 players tied at 3.5/5, decided on Buchholz. Title race narrowed from 2 co-leaders at R4 to 3 at the finish.
3 players finish on 3.5/5. Tugsbilguun takes the title on Buchholz Cut1 (10.0).
Davganamdag Tugsbilguun went unbeaten across 5 games (R1–R5).
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Tugsbilguun, Davganamdag | 1952 | MGL | +8B | +7N | =6B | =11N | =19N | 3.5 | 10.0 | 12.0 | 8.50 | 1926 | -4.0 |
| 2 | Kailash, Vaibhav | 1722 | USA | =18B | =23N | +16B | =20N | +6B | 3.5 | 8.5 | 10.5 | 7.50 | 1829 | +11.2 |
| 3 | Suddala, Anish | 1785 | USA | +32N | −15B | =33B | +40N | +9B | 3.5 | 6.5 | 6.5 | 4.00 | 2553 | +36.8 |
| 4 | Pennington-Cross, Nicholas Lee | 1691 | USA | −16B | =17N | =34B | +38N | +15B | 3.0 | 7.0 | 7.5 | 4.00 | 1776 | +13.6 |
| 5 | Stein, Josiah | 1960 | USA | F | +16N | +40B | +6N | −13B | 3.0 | 7.0 | 7.0 | 4.50 | 1844 | -7.8 |
| 6 | Shah, Aarav | 1710 | USA | +17B | +33N | =1N | −5B | −2N | 2.5 | 12.0 | 13.0 | 4.75 | 1724 | -0.4 |
| 7 | Sridhar, Vinay | 1763 | USA | +12B | −1B | =10N | =34N | =31B | 2.5 | 10.0 | 11.0 | 5.00 | 1814 | +13.6 |
| 8 | Kaur, JindCM | 1641 | USA | −1N | +32B | −11B | =18N | +29B | 2.5 | 9.5 | 10.5 | 3.50 | 1754 | +18.8 |
| 9 | Higuchi, Hiro | 1834 | USA | =28N | +38B | =22N | =21B | −3N | 2.5 | 9.0 | 9.5 | 3.25 | 1760 | -10.0 |
| 10 | Jing, Aaron C | 1860 | USA | =23B | =21N | =7B | =17N | =20B | 2.5 | 8.5 | 10.5 | 5.25 | 1729 | -17.2 |
| 11 | Akintonde, Jimi | 1927 | USA | F | F | +8N | =1B | +21N | 2.5 | 8.0 | 8.0 | 6.25 | 2071 | +10.6 |
| 12 | Sax, Robert | 1779 | USA | −7N | +18N | =28B | −30B | +40N | 2.5 | 7.5 | 7.5 | 2.75 | 1732 | -6.4 |
| 13 | Lee, Sebastian | 1774 | USA | F | F | +15N | =19B | +5N | 2.5 | 7.0 | 7.0 | 6.00 | 2095 | +16.8 |
| 14 | Nudo, Zachary W | 1767 | USA | −35N | F | +36N | +15B | =22B | 2.5 | 6.0 | 6.0 | 4.00 | 1978 | +11.0 |
| 15 | Hanninen, Carter James | 0 | USA | +24B | +3N | −13B | −14N | −4N | 2.0 | 11.5 | 13.5 | 5.50 | 1561 | 0.0 |
| 16 | Tang, Emily Jiaying | 0 | USA | +4N | −5B | −2N | =37B | =33N | 2.0 | 10.5 | 11.5 | 4.00 | 1715 | 0.0 |
| 17 | Anand, Anirudh | 1607 | USA | −6N | =4B | +27N | =10B | F | 2.0 | 10.0 | 10.0 | 4.75 | 1628 | +2.4 |
| 18 | Ruiz, Emmanuel | 1752 | USA | =2N | −12B | =38N | =8B | =36N | 2.0 | 9.5 | 10.0 | 3.75 | 1649 | -14.2 |
| 19 | Thain, Jack | 1844 | USA | F | F | +26N | =13N | =1B | 2.0 | 8.0 | 8.0 | 5.00 | 1989 | +23.2 |
| 20 | Thompson, Sean D | 1726 | USA | F | F | +31B | =2B | =10N | 2.0 | 7.5 | 7.5 | 4.50 | 1922 | +15.6 |
| 21 | Zhang, MichelleWCM | 1801 | USA | F | =10B | +41N | =9N | −11B | 2.0 | 7.5 | 7.5 | 2.50 | 1748 | -8.4 |
| 22 | Misra, Pragyan | 1788 | USA | F | F | =9B | +25B | =14N | 2.0 | 7.0 | 7.0 | 4.50 | 1889 | +16.0 |
| 23 | Von Hoff, Christopher Daniel | 1746 | USA | =10N | =2B | F | F | +34B | 2.0 | 7.0 | 7.0 | 4.00 | 1875 | +10.4 |
| 24 | Shafer, Luke Robert | 0 | USA | −15N | +29B | =30N | =28B | F | 2.0 | 6.5 | 6.5 | 3.00 | 1754 | 0.0 |
| 25 | Silvestre, Lucas | 1693 | USA | F | F | +35B | −22N | +28N | 2.0 | 4.5 | 4.5 | 2.50 | 1769 | +8.4 |
| 26 | Peterson, Brian | 1865 | USA | +29B | +35N | −19B | F | F | 2.0 | 4.5 | 4.5 | 2.50 | 1788 | -4.2 |
| 27 | FIDE 88154343 | 0 | — | F | F | −17B | +32N | +37B | 2.0 | 4.0 | 4.0 | 2.00 | 1722 | 0.0 |
| 28 | Davenport, Alan Lee | 1749 | USA | =9B | F | =12N | =24N | −25B | 1.5 | 9.0 | 9.0 | 3.50 | 1643 | -16.8 |
| 29 | Cai, Andrew | 1732 | USA | −26N | −24N | +32B | =36B | −8N | 1.5 | 7.5 | 8.5 | 1.50 | 1490 | -34.8 |
| 30 | Luster, Shakira | 1722 | USA | F | F | =24B | +12N | F | 1.5 | 4.5 | 4.5 | 3.50 | 2579 | +23.2 |
| 31 | Hamilton, Mark P | 1810 | USA | F | F | −20N | +41B | =7N | 1.5 | 4.5 | 4.5 | 1.25 | 1552 | -13.6 |
| 32 | Pullabhotla, Aditya | 0 | USA | −3B | −8N | −29N | −27B | +41N | 1.0 | 9.5 | 9.5 | 0.00 | 919 | 0.0 |
| 33 | FIDE 39985199 | 0 | — | F | −6B | =3N | F | =16B | 1.0 | 8.0 | 8.0 | 2.75 | 1555 | 0.0 |
| 34 | Girish, Adarsh | 1669 | USA | F | F | =4N | =7B | −23N | 1.0 | 7.5 | 7.5 | 2.75 | 1608 | -9.2 |
| 35 | Wzorek, Dylan | 0 | USA | +14B | −26B | −25N | F | F | 1.0 | 6.5 | 6.5 | 2.50 | 1650 | 0.0 |
| 36 | Jayam, Srikar | 1783 | USA | F | F | −14B | =29N | =18B | 1.0 | 6.0 | 6.0 | 1.75 | 1625 | -25.2 |
| 37 | Zazove, David | 1836 | USA | F | F | =39B | =16N | −27N | 1.0 | 4.5 | 4.5 | 1.25 | 1779 | -1.6 |
| 38 | Smalls, Jay D | 1680 | USA | F | −9N | =18B | −4B | F | 0.5 | 7.5 | 7.5 | 1.00 | 1485 | -13.4 |
| 39 | Bose, Somil | 1779 | USA | F | F | =37N | F | F | 0.5 | 1.0 | 1.0 | 0.50 | 1836 | +3.2 |
| 40 | Bao, Ronny | 1675 | USA | F | F | −5N | −3B | −12B | 0.0 | 9.0 | 9.0 | 0.00 | 1041 | -34.8 |
| 41 | Li, David | 0 | USA | F | F | −21B | −31N | −32B | 0.0 | 4.5 | 4.5 | 0.00 | 1006 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Suddala, AnishUSA+36.83.5 pts · #16
- 2Thain, JackUSA+23.22.0 pts · #10
- 3Luster, ShakiraUSA+23.21.5 pts · #31
- 1Bao, RonnyUSA-34.80.0 pts · #39
- 2Cai, AndrewUSA-34.81.5 pts · #37
- 3Jayam, SrikarUSA-25.21.0 pts · #30
- R5+186 Elo gap