XIV Pan-American School Chess Championship 2025 STD U11 Girls
15 players participated in this 9-round tournament, held from 30 Aug 2025 to 05 Sept 2025 in Florianopolis SC, Brazil. 3 titled players from 6 federations. Top 10 Elo average was 1387, and top seed was Kara Chan (🇨🇦 CAN, WCM, 1739).
Kara Chan (🇨🇦 CAN, WCM, 1739) won with 8.0/9, ahead of Koharu Aize Torres Arambulo (8.0) and Maria Eduarda Mazzaroppi Lisboa (6.0). Chan shared the lead from round 6, winning on tie-break.
The biggest upset came in round 6: Kelsy Johana Vera Toro (1558) beat Koharu Aize Torres Arambulo (WCM, 1726), a +168-point gap.
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How it unfolded
Top 6 · 9 roundsTight race until R9; 2 players tied at 8.0/9, decided on Buchholz.
2 players finish on 8.0/9. Chan takes the title on Buchholz Cut1 (39.5).
WCM Kara Chan lost to WCM Koharu Aize Torres Arambulo (Black).
WCM Kara Chan 3+5 wins (R1–R3, R5–R9)WCM Koharu Aize Torres Arambulo 5+3 wins (R1–R5, R7–R9)Maria Eduarda Mazzaroppi Lisboa 4 wins (R6–R9)
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1WCMKara Chan | * | 0 | 1 | 1 |
| 2WCMKoharu Aize Torres Arambulo | 1 | * | 1 | 1 |
| 3Maria Eduarda Mazzaroppi Lisboa | 0 | 0 | * | 1 |
| 4Adriana Rafaela Chueca Balcazar | 0 | 0 | 0 | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | R8 | R9 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Chan, KaraWCM | 1739 | CAN | +10B | +8N | +3B | −2N | +5B | +7N | +4B | +9N | +6B | 8.0 | 39.5 | 42.5 | 34.50 | 1847 | +31.2 |
| 2 | Torres Arambulo, Koharu AizeWCM | 1726 | PER | +13N | +5B | +7N | +1B | +3B | −4N | +8B | +6B | +9N | 8.0 | 39.5 | 42.0 | 37.00 | 1833 | +30.0 |
| 3 | Lisboa, Maria Eduarda Mazzaroppi | 1524 | BRA | F | +11B | −1N | +9B | −2N | +5N | +7B | +4N | +14N | 6.0 | 38.0 | 38.0 | 22.00 | 1690 | +52.0 |
| 4 | Vera Toro, Kelsy Johana | 1558 | ECU | +6N | +9B | −5N | −7B | +10N | +2B | −1N | −3B | +15B | 5.0 | 41.5 | 42.5 | 19.50 | 1492 | -27.2 |
| 5 | Chueca Balcazar, Adriana Rafaela | 1478 | PER | +14B | −2N | +4B | +11N | −1N | −3B | F | +8N | +7B | 5.0 | 40.0 | 40.0 | 18.00 | 1571 | +21.6 |
| 6 | Aulicino, Ana Helena Leite | 0 | BRA | −4B | +12N | =8B | +14N | −7N | +13B | +10B | −2N | −1N | 4.5 | 37.5 | 39.5 | 12.50 | 1364 | 0.0 |
| 7 | Fernandez Mayorga, ElenaWCM | 1457 | CRC | +12B | +10N | −2B | +4N | +6B | −1B | −3N | F | −5N | 4.0 | 42.5 | 42.5 | 15.50 | 1455 | +12.4 |
| 8 | Gaona Garrido, Estefania | 1483 | MEX | +15N | −1B | =6N | =12B | +9N | +11B | −2N | −5B | F | 4.0 | 35.5 | 35.5 | 10.75 | 1415 | -14.4 |
| 9 | Fiallos Garces, Camila Isabel | 1465 | ECU | F | −4N | +15B | −3N | −8B | +14N | +13N | −1B | −2B | 3.0 | 36.5 | 36.5 | 5.50 | 805 | -64.8 |
| 10 | Naidon, Rafaela Weber | 1435 | BRA | −1N | −7B | +13N | +15B | −4B | F | −6N | +12B | −11N | 3.0 | 31.0 | 31.0 | 6.50 | 766 | -40.8 |
| 11 | Kneidl, Aline | 0 | BRA | F | −3N | +14B | −5B | +12N | −8N | −15B | −13N | +10B | 3.0 | 26.5 | 26.5 | 8.00 | 1291 | 0.0 |
| 12 | Mattoso,Rafaela Vilela | 0 | BRA | −7N | −6B | F | =8N | −11B | +15N | +14B | −10N | =13B | 3.0 | 24.0 | 24.0 | 6.25 | 1165 | 0.0 |
| 13 | FIDE 39990680 | 0 | — | −2B | −14N | −10B | F | +15N | −6N | −9B | +11B | =12N | 2.5 | 27.5 | 27.5 | 5.50 | 742 | 0.0 |
| 14 | FIDE 3663493 | 0 | — | −5N | +13B | −11N | −6B | F | −9B | −12N | +15N | −3B | 2.0 | 28.0 | 28.0 | 3.50 | 696 | 0.0 |
| 15 | FIDE 538053420 | 0 | — | −8B | F | −9N | −10N | −13B | −12B | +11N | −14B | −4N | 1.0 | 25.5 | 25.5 | 3.00 | 684 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Lisboa, Maria Eduarda MazzaroppiBRA+52.06.0 pts · #3
- 2Chan, KaraWCMCAN+31.28.0 pts · #1
- 3Torres Arambulo, Koharu AizeWCMPER+30.08.0 pts · #2
- 1Fiallos Garces, Camila IsabelECU-64.83.0 pts · #13
- 2Naidon, Rafaela WeberBRA-40.83.0 pts · #12
- 3Vera Toro, Kelsy JohanaECU-27.25.0 pts · #5
- R6+168 Elo gap
- R4+101 Elo gap