XIV Pan-American School Chess Championship 2025 STD U15 Open
26 players participated in this 9-round tournament, held from 30 Aug 2025 to 05 Sept 2025 in Florianopolis SC, Brazil. 3 titled players from 5 federations. Top 10 Elo average was 1971, and top seed was Frederico Rodrigues Jardim (🇧🇷 BRA, FM, 2254).
Cristhian Yamil Reyes Zavaleta (🇵🇪 PER, FM, 2157) won with 8.0/9, ahead of Frederico Rodrigues Jardim (7.0) and Adriano Jaffet Levano Loayza (6.0). Reyes Zavaleta won solo starting round 4.
The biggest upset came in round 9: Artur Mattos De Bortolo (1627) beat Ezequiel Acevedo Barreto (1773), a +146-point gap.
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How it unfolded
Top 6 · 9 roundsFM Cristhian Yamil Reyes Zavaleta led from R4; +1.0-point edge over the runner-up.
FM Cristhian Yamil Reyes Zavaleta never relinquished the lead after R4; final gap +1.0 over the runner-up.
FM Cristhian Yamil Reyes Zavaleta drew with FM Frederico Rodrigues Jardim (Black).
FM Cristhian Yamil Reyes Zavaleta won 4 in a row (R1–R4).
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1FMCristhian Yamil Reyes Zavaleta | * | ½ | 1 | 1 |
| 2FMFrederico Rodrigues Jardim | ½ | * | — | 1 |
| 3Fernando Enrique Gil Chacon | 0 | — | * | ½ |
| 4CMAdriano Jaffet Levano Loayza | 0 | 0 | ½ | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 | R9 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Reyes Zavaleta, Cristhian YamilFM | 2157 | PER | +18N | +17B | +4N | +3B | =2N | +5B | =6N | +9B | +10N | 8.0 | 44.5 | 48.0 | 41.75 | 2292 | +47.6 |
| 2 | Jardim, Frederico RodriguesFM | 2254 | BRA | +12B | +22N | =6B | +9N | =1B | =4N | +3N | +17B | =7N | 7.0 | 44.5 | 47.0 | 34.50 | 2153 | -27.2 |
| 3 | Levano Loayza, Adriano JaffetCM | 2080 | PER | +14B | +19N | +9B | −1N | +6B | +10N | −2B | =5N | =4B | 6.0 | 47.0 | 50.5 | 29.50 | 2054 | -4.4 |
| 4 | Ramalho, Lucas Pereira | 1882 | BRA | +15B | +25N | −1B | +12N | +18B | =2B | −9N | +6B | =3N | 6.0 | 44.0 | 46.0 | 26.50 | 2037 | +61.2 |
| 5 | Gil Chacon, Fernando Enrique | 1912 | ARG | +11B | =21N | =10B | =6N | +19B | −1N | +8N | =3B | +9N | 6.0 | 43.5 | 46.0 | 28.50 | 1987 | +39.2 |
| 6 | Spagnollo, Pedro Henrique | 1975 | BRA | +23N | +7B | =2N | =5B | −3N | +13B | =1B | −4N | +14B | 5.5 | 47.5 | 50.0 | 27.50 | 1980 | +5.6 |
| 7 | Cardenas Huachaca, Alessandro Jair | 1830 | PER | +26B | −6N | −19B | +15N | +22B | −9N | +12B | +11N | =2B | 5.5 | 37.5 | 38.5 | 21.00 | 1874 | +16.0 |
| 8 | Villaverde Salas, Gonzalo Matias | 1861 | PER | F | =11N | +14B | −10N | +21B | +18N | −5B | +15N | +17B | 5.5 | 35.0 | 37.5 | 21.50 | 1879 | +10.8 |
| 9 | Kunapuli, Siddarth Sriaditya | 1889 | USA | +24N | +13B | −3N | −2B | +23N | +7B | +4B | −1N | −5B | 5.0 | 45.5 | 47.5 | 20.50 | 1929 | +13.6 |
| 10 | Deretti, Lucas Jurk | 1850 | BRA | −13N | +16B | =5N | +8B | =17N | −3B | +19N | +18B | −1B | 5.0 | 42.0 | 45.5 | 22.00 | 1975 | +50.4 |
| 11 | De Bortolo, Artur Mattos | 1627 | BRA | −5N | =8B | =20N | +24B | +14N | =17B | =13N | −7B | +22N | 5.0 | 36.0 | 38.0 | 17.75 | 1843 | +78.4 |
| 12 | Orsini, Cesar Oliveira | 1789 | BRA | −2N | +24B | +23N | −4B | =13N | =19B | −7N | =16B | +18N | 4.5 | 37.0 | 39.0 | 14.25 | 1799 | -0.4 |
| 13 | Tarazona Guzman, Piero Eleazar | 0 | PER | +10B | −9N | =22B | +21N | =12B | −6N | =11B | −14N | +25B | 4.5 | 34.5 | 36.5 | 15.50 | 1728 | 0.0 |
| 14 | Leite Lima,Luiz Henrique | 1693 | BRA | −3N | =20B | −8N | +25B | −11B | +26N | +22N | +13B | −6N | 4.5 | 34.5 | 35.5 | 11.75 | 1623 | -20.4 |
| 15 | Ramos, Rafael Cabreira | 1613 | BRA | −4N | −18B | +16N | −7B | +24N | +23B | =17N | −8B | +26N | 4.5 | 33.5 | 34.5 | 12.00 | 1728 | +44.4 |
| 16 | Ricapa Cavero, Sebastian Gerardo | 1638 | PER | F | −10N | −15B | +26N | −20B | +21N | +25B | =12N | +24B | 4.5 | 25.0 | 25.0 | 9.75 | 1690 | +10.8 |
| 17 | Monteiro, Samuel Ramazzotte | 1853 | BRA | +20B | −1N | +21B | =19N | =10B | =11N | =15B | −2N | −8N | 4.0 | 42.0 | 44.5 | 15.00 | 1749 | -51.2 |
| 18 | Zanghelini, Pedro Miguel | 1778 | BRA | −1B | +15N | +25B | =22N | −4N | −8B | +20B | −10N | −12B | 3.5 | 39.5 | 41.5 | 11.25 | 1617 | -58.0 |
| 19 | Altenhofen, Guilherme Graneto | 1751 | BRA | F | −3B | +7N | =17B | −5N | =12N | −10B | =21N | +20B | 3.5 | 37.0 | 37.0 | 14.50 | 1739 | -8.0 |
| 20 | Tochizawa, Enrico Godoy | 0 | BRA | −17N | =14N | =11B | −23B | +16N | =22B | −18N | +26B | −19N | 3.5 | 30.0 | 31.0 | 11.50 | 1585 | 0.0 |
| 21 | Da Silva, Kauan Carlos Cardoso | 1572 | BRA | F | =5B | −17N | −13B | −8N | −16B | +26N | =19B | =23N | 2.5 | 36.0 | 37.0 | 7.00 | 1592 | +2.0 |
| 22 | Acevedo Barreto, Ezequiel | 1773 | PAR | F | −2B | =13N | =18B | −7N | =20N | −14B | +24N | −11B | 2.5 | 35.5 | 35.5 | 7.75 | 1595 | -59.6 |
| 23 | Da Fonseca, Henrique Gomez | 1686 | BRA | −6B | +26N | −12B | +20N | −9B | −15N | −24B | −25N | =21B | 2.5 | 29.5 | 30.5 | 5.75 | 1343 | -84.0 |
| 24 | Da Fonseca, Arthur Gomez | 1626 | BRA | −9B | −12N | +26B | −11N | −15B | −25N | +23N | −22B | −16N | 2.0 | 30.5 | 31.5 | 3.50 | 1408 | -66.8 |
| 25 | Roeder, Vinicius Bona | 0 | BRA | F | −4B | −18N | −14N | −26B | +24B | −16N | +23B | −13N | 2.0 | 28.5 | 28.5 | 4.50 | 1594 | 0.0 |
| 26 | Valerim, Rafael Morais | 0 | BRA | −7N | −23B | −24N | −16B | +25N | −14B | −21B | −20N | −15B | 1.0 | 29.5 | 31.5 | 2.00 | 867 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1De Bortolo, Artur MattosBRA+78.45.0 pts · #11
- 2Ramalho, Lucas PereiraBRA+61.26.0 pts · #6
- 3Deretti, Lucas JurkBRA+50.45.0 pts · #7
- 1Da Fonseca, Henrique GomezBRA-84.02.5 pts · #25
- 2Da Fonseca, Arthur GomezBRA-66.82.0 pts · #23
- 3Acevedo Barreto, EzequielPAR-59.62.5 pts · #21
- R9+146 Elo gap