XIV Pan-American School Chess Championship 2025 STD U13 Open
Open SwissStandard
33 players participated in this 9-round tournament, held from 30 Aug 2025 to 05 Sept 2025 in Florianopolis SC, Brazil. 4 titled players from 7 federations. Top 10 Elo average was 1967, and top seed was Lucas Galvan Calcada (🇧🇷 BRA, 2073).
Aayansh Guntaka (🇺🇸 USA, FM, 1889) won with 8.0/9, ahead of Lucas Galvan Calcada (7.5) and Enzo Mathias Vinales Gonzalez (6.5). Guntaka won solo starting round 6.
The biggest upset came in round 9: Gabriel Conte Dos Santos (1542) beat Melian Cabrera (1894), a +352-point gap.
Location
🇧🇷Florianopolis SC, Brazil
Dates
30 Aug 2025 → 05 Sept 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss · 9 rounds
Titled players · 4
FM×2
CM×2
Federations · 7 represented
🇧🇷Brazil×15
🇵🇾Paraguay×7
🇨🇦Canada×4
🇵🇪Peru×2
🇺🇸United States of America×2
🇦🇷Argentina×1
🇩🇴Dominican Republic×1
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 9 roundsFM Aayansh Guntaka led from R6; +0.5-point edge over the runner-up. Title race converged from 4 co-leaders at R4 to 1 by R6.
Co-leaders
14
5
2
4
2
1
1
1
1
R6–R9 · LEAD HELD
FM Aayansh Guntaka held the sole lead from R6 through R9 without losing it.
R5 · HEAD-TO-HEAD · WINNER VS 2ND
FM Aayansh Guntaka beat Lucas Galvan Calcada (Black).
WIN STREAKS · 3 top finishers
FM Aayansh Guntaka 3+4 wins (R1–R3, R5–R8)Lucas Galvan Calcada 4 wins (R6–R9)FM Enzo Mathias Vinales Gonzalez 3 wins (R5–R7)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1FMAayansh Guntaka | * | 1 | 1 | ½ |
| 2Lucas Galvan Calcada | 0 | * | — | 1 |
| 3FMEnzo Mathias Vinales Gonzalez | 0 | — | * | — |
| 4CMHeye Gao | ½ | 0 | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 | R9 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Guntaka, AayanshFM | 1889 | USA | +18N | +32B | +6N | =9B | +2N | +13B | +10N | +3B | =4N | 8.0 | 44.5 | 46.0 | 40.50 | 2217 | +136.4 |
| 2 | Calcada, Lucas Galvan | 2073 | BRA | +7B | =10N | +28B | +4N | −1B | +11N | +5B | +9N | +6B | 7.5 | 46.0 | 48.5 | 38.00 | 2147 | +36.0 |
| 3 | Vinales Gonzalez, Enzo MathiasFM | 2042 | PAR | +27N | =16B | +19N | −12B | +14N | +8B | +9N | −1N | +7B | 6.5 | 42.5 | 45.5 | 30.25 | 1918 | -29.4 |
| 4 | Gao, HeyeCM | 2068 | CAN | +8N | +23B | =12N | −2B | −5B | +28N | +19B | +11N | =1B | 6.0 | 44.5 | 47.0 | 27.00 | 1951 | -40.8 |
| 5 | Huang, Justin | 1811 | CAN | +30N | −6B | +16N | +15B | +4N | =9B | −2N | =12B | +11N | 6.0 | 43.5 | 46.0 | 28.00 | 1993 | +86.4 |
| 6 | Lara Santos, Angel SebastianCM | 2059 | DOM | +15B | +5N | −1B | −10N | +20B | +23N | =7B | +21B | −2N | 5.5 | 45.0 | 48.5 | 25.25 | 1869 | -69.6 |
| 7 | Waterkemper, Lucas Bauler | 1623 | BRA | −2N | =19B | =17N | +25B | +15N | +21B | =6N | +10B | −3N | 5.5 | 42.0 | 45.5 | 24.50 | 1816 | +80.0 |
| 8 | Motta, Pedro Jose Colombo | 1603 | BRA | −4B | +20N | +29B | −11N | +18B | −3N | +23B | =13N | +16B | 5.5 | 38.5 | 41.0 | 21.00 | 1809 | +89.6 |
| 9 | Lee, Daniel Joshua | 1969 | CAN | +24B | +14N | +11B | =1N | +10B | =5N | −3B | −2B | −12N | 5.0 | 48.0 | 51.5 | 25.50 | 1904 | -26.0 |
| 10 | Fernandez Monteza, Fabian Arturo | 1856 | PER | +26N | =2B | +22N | +6B | −9N | +12B | −1B | −7N | =13B | 5.0 | 45.5 | 48.5 | 23.75 | 1891 | +18.4 |
| 11 | Yu, Vincent Zhiwen | 1868 | USA | +20B | +29N | −9N | +8B | +12N | −2B | +13N | −4B | −5B | 5.0 | 44.0 | 46.5 | 22.00 | 1835 | -8.0 |
| 12 | Dos Santos, Leonardo Lopes | 1955 | BRA | F | +13N | =4B | +3N | −11B | −10N | +16B | =5N | +9B | 5.0 | 43.0 | 43.0 | 27.00 | 1965 | +7.6 |
| 13 | Telles, Arnoldo Beber | 1639 | BRA | +31N | −12B | +32N | +22B | +21N | −1N | −11B | =8B | =10N | 5.0 | 38.5 | 40.0 | 16.75 | 1768 | +49.2 |
| 14 | Lelinski, Arthur | 1682 | BRA | +25N | −9B | =18N | +19B | −3B | −16N | +27B | =22N | +21B | 5.0 | 35.5 | 38.5 | 18.50 | 1751 | +26.8 |
| 15 | Mino Almiron, Joaquin A. | 1599 | PAR | −6N | +26B | +31B | −5N | −7B | +29N | +20B | −16N | +18B | 5.0 | 35.0 | 37.0 | 15.50 | 1647 | +11.5 |
| 16 | Altenhofen, Rafael Graneto | 1700 | BRA | +17B | =3N | −5B | −28N | +26N | +14B | −12N | +15B | −8N | 4.5 | 40.5 | 43.0 | 20.75 | 1692 | -7.6 |
| 17 | Villanueva Menendez, Joaquin | 1459 | PAR | −16N | =27B | =7B | −20N | +31B | =24N | +29B | =18N | =19B | 4.5 | 31.0 | 33.0 | 14.50 | 1534 | +29.6 |
| 18 | Dure Hetter, Alejo Daniel | 1543 | PAR | −1B | +33N | =14B | =24N | −8N | +26B | =22N | =17B | −15N | 4.0 | 38.5 | 38.5 | 11.50 | 1567 | +0.6 |
| 19 | Su, Jayden Chenxuan | 1627 | CAN | +33B | =7N | −3B | −14N | +32N | =22B | −4N | =24B | =17N | 4.0 | 36.5 | 36.5 | 10.25 | 1641 | -7.2 |
| 20 | Dos Santos, Gabriel Conte | 1542 | BRA | −11N | −8B | +30N | +17B | −6N | +25B | −15N | F | +22B | 4.0 | 35.5 | 35.5 | 14.50 | 1669 | +44.0 |
| 21 | Ortiz Bareiro, Josias Ezequiel | 1544 | PAR | −22N | +25B | +27N | +23B | −13B | −7N | +28B | −6N | −14N | 4.0 | 35.0 | 37.5 | 12.50 | 1647 | +41.6 |
| 22 | Cabrera , Melian | 1894 | ARG | +21B | =28N | −10B | −13N | +24B | =19N | =18B | =14B | −20N | 4.0 | 34.5 | 37.0 | 15.25 | 1574 | -135.2 |
| 23 | Maset, Pedro Yuki Yoshida | 1840 | BRA | F | −4N | +24B | −21N | +28B | −6B | −8N | +26B | =25N | 3.5 | 33.5 | 33.5 | 10.75 | 1631 | -80.4 |
| 24 | Lopez Maldonado, Matias Nicolas | 1575 | PAR | −9N | +30B | −23N | =18B | −22N | =17B | F | =19N | +26B | 3.5 | 30.5 | 30.5 | 11.75 | 1630 | +13.6 |
| 25 | Rojas Raraz, John Arick | 1434 | PER | −14B | −21N | F | −7N | +30B | −20N | +31B | +29N | =23B | 3.5 | 29.0 | 29.0 | 8.75 | 1494 | +2.8 |
| 26 | Friedrich, Augusto Johannpeter | 1531 | BRA | −10B | −15N | +33B | +31N | −16B | −18N | +30B | −23N | −24N | 3.0 | 30.0 | 30.0 | 4.50 | 1353 | -55.6 |
| 27 | Yamamoto, Pedro Machado | 1580 | BRA | −3B | =17N | −21B | +33N | −29B | F | −14N | +32B | =30N | 3.0 | 26.5 | 26.5 | 5.00 | 1434 | -60.4 |
| 28 | Castilhos, Ryan Da Paixao | 1541 | BRA | F | =22B | −2N | +16B | −23N | −4B | −21N | +31B | F | 2.5 | 31.5 | 31.5 | 8.50 | 1617 | +11.6 |
| 29 | Rahn, Johan Felipe | 1424 | BRA | F | −11B | −8N | =32B | +27N | −15B | −17N | −25B | +33N | 2.5 | 28.0 | 28.0 | 3.75 | 1352 | -25.2 |
| 30 | Noguera Villalba, Vidal Samuel | 1518 | PAR | −5B | −24N | −20B | F | −25N | +32B | −26N | +33N | =27B | 2.5 | 24.5 | 24.5 | 3.00 | 1348 | -58.8 |
| 31 | Carvalho, Arthur Gomes Dummar | 0 | BRA | −13B | F | −15N | −26B | −17N | +33B | −25N | −28N | +32B | 2.0 | 25.0 | 25.0 | 1.50 | 1230 | 0.0 |
| 32 | Vailatti, Eduardo Gabriel | 1538 | BRA | F | −1N | −13B | =29N | −19B | −30N | +33B | −27N | −31N | 1.5 | 27.0 | 27.0 | 1.25 | 1212 | -78.8 |
| 33 | FIDE 3480143 | 0 | — | −19N | −18B | −26N | −27B | F | −31N | −32N | −30B | −29B | 0.0 | 22.5 | 22.5 | 0.00 | 737 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Guntaka, AayanshFMUSA+136.48.0 pts · #1
- 2Motta, Pedro Jose ColomboBRA+89.65.5 pts · #8
- 3Huang, JustinCAN+86.46.0 pts · #5
Top rating losers
- 1Cabrera , MelianARG-135.24.0 pts · #19
- 2Maset, Pedro Yuki YoshidaBRA-80.43.5 pts · #22
- 3Vailatti, Eduardo GabrielBRA-78.81.5 pts · #32
Biggest upsets
- R9+352 Elo gap
- R4+296 Elo gap
- R5+257 Elo gap