CChessStats

XIV Pan-American School Chess Championship 2025 STD U15 Girls

Open SwissStandard

20 players participated in this 9-round tournament, held from 30 Aug 2025 to 05 Sept 2025 in Florianopolis SC, Brazil. 4 federations represented. Top 10 Elo average was 1739, and top seed was Mariana Nara Santana Da Costa (🇧🇷 BRA, 1934).

Luana Felipe Simoncini (🇧🇷 BRA, 1823) won with 7.0/9, ahead of Mariana Nara Santana Da Costa (7.0) and Eduarda Frassetto (7.0). Simoncini shared the lead from round 7, winning on tie-break.

The biggest upset came in round 4: Eduarda Frassetto (1568) beat Mariana Nara Santana Da Costa (1934), a +366-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
Top seed
🇧🇷Mariana Nara Santana Da Costa1934
Avg top 10
1,739
Participants
20
Federations · 4 represented
🇧🇷Brazil×17
🇦🇷Argentina×1
🇨🇱Chile×1
🇵🇪Peru×1
Top 3

How it unfolded

Top 6 · 9 rounds

Tight race until R9; 3 players tied at 7.0/9, decided on Buchholz. Title race narrowed from 3 co-leaders at R4 to 3 at the finish.

Co-leaders
6
3
2
3
3
2
3
3
3
2.54.579R1R2R3R4R5R6R7R8R9
Frassetto7Simoncini7Da Costa7Ramos5.5Vieira5Ramazzotte5
R9 · TIEBREAK CLUSTER

3 players finish on 7.0/9. Simoncini takes the title on Buchholz Cut1 (43.0).

R2 · HEAD-TO-HEAD · WINNER VS 2ND

Eduarda Frassetto lost to Luana Felipe Simoncini (Black).

WIN STREAKS · 3 top finishers

Eduarda Frassetto 3 wins (R7–R9)Luana Felipe Simoncini 3+3 wins (R1–R3, R7–R9)Mariana Nara Santana Da Costa 5 wins (R5–R9)

Key matchups · top 4

Head-to-head between the four finishers
Player1234
1Eduarda Frassetto*
0
1
½
2Luana Felipe Simoncini
1
*
0
½
3Mariana Nara Santana Da Costa
0
1
*
1
4Fernanda Cabreira Ramos
½
½
0
*

Grille américaine

#PlayerEloFedR1R2R3R4R5R6R7R8R9PtsBu C1BuSBPerfΔ
1Simoncini, Luana Felipe1823BRA+6N+3B+10N=4B=5N−2B+15N+7B+12N7.043.046.534.251893+33.2
2Da Costa, Mariana Nara Santana1934BRA−5B+20N+8B−3N+12B+1N+4B+9N+6B7.042.544.032.001889-12.4
3Frassetto, Eduarda1568BRA+9B−1N+12B+2B=4N=8N+5B+13N+10B7.042.046.034.001951+173.6
4Ramos, Fernanda Cabreira1671BRA+14N+16B+13N=1N=3B=5B−2N+8B−7N5.543.547.025.501760+38.8
5Vieira, Luiza Lessing1655BRA+2N=13B+15N+10B=1B=4N−3N−6B=9B5.044.548.025.501734+35.6
6Heise Hidalgo, Claudia Sofia1617CHI−1B+17N+19B=9N−8B+12N=16B+5N−2N5.038.040.017.501676+15.6
7Ramazzotte, Esther Zilli1811BRA=18B−8N+20B=15N+9B=16N=13B−1N+4B5.035.036.518.251678-57.2
8Stenzler, Nicolle Vortmann1741BRA=15N+7B−2N=13B+6N=3B=9B−4N=16B4.541.545.021.251674-30.8
9Yassuda,Mariana Mayum Shiguematsu1766BRA−3N+11B+16N=6B−7N+19B=8N−2B=5N4.541.543.517.251616-62.0
10Yoon, Luiza Yuna1658BRA+17B+19N−1B−5N−15B+11N=14B+16N−3N4.537.039.014.501454-64.0
11Biazon, Heloise De Oliveira1423BRAF−9N+18B−12N+17B−10B+19N=14N+20B4.525.525.510.501545+27.2
12Biazon, Natalia De Oliveira1642BRAF+14B−3N+11B−2N−6B+20N+18N−1B4.038.538.512.501577-26.8
13Herrera, Lara1686ARG+20B=5N−4B=8N+19N=15B=7N−3BF4.035.036.512.501575-41.2
14Depaoli, Luiza Torma0BRA−4B−12N−17B+20N−16N+18B=10N=11B+15N4.030.532.012.0015530.0
15Danker, Nikole1490BRA=8B+18N−5B=7B+10N=13N−1B−17N−14B3.536.539.013.751708+75.2
16Nunes, Nicole1519BRAF−4N−9B+17N+14B=7B=6N−10B=8N3.535.535.513.751519-1.2
17De Freitas, Manuela Schmitz0BRA−10N−6B+14N−16B−11N=20B−18N+15B−19B2.529.531.08.2513030.0
18Monteiro, Melissa1583BRA=7N−15B−11N−19B+20N−14N+17B−12BF2.529.531.06.501411-46.8
19De Camargo, Valkiria Scheid0BRAF−10B−6N+18N−13B−9N−11B−20B+17N2.029.029.05.0012880.0
20Amaro Guere, Kristine Lourdes1438PER−13N−2B−7N−14B−18B=17N−12B+19N−11N1.533.535.53.25864-56.8

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers
Top rating losers
Biggest upsets