CChessStats

San Juan Chess Club Invitational Nacional

Open SwissStandard

10 players participated in this 9-round tournament, held from 19 Nov 2025 to 24 Nov 2025 in San Juan, Puerto Rico. 1 titled players. Top 10 Elo average was 1572, and top seed was Joshua Pedrosa Rivera (🇵🇷 PUR, 1940).

Louis E. Carrion Perez (🇵🇷 PUR, 1894) won with 8.0/9, ahead of Joshua Pedrosa Rivera (8.0) and Jomar Capeles Mendoza (6.5). Carrion Perez shared the lead from round 1, winning on tie-break.

The biggest upset came in round 6: Alexander Ryder (1523) beat Vladimir S. Ortiz Colon (1673), a +150-point gap.

Location
🇵🇷San Juan, Puerto Rico
Dates
19 Nov 2025 → 24 Nov 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss · 9 rounds
Top seed
🇵🇷Joshua Pedrosa Rivera1940
Avg top 10
1,572
Participants
10
Titled players · 1
CM×1
Federations · 1 represented
🇵🇷Puerto Rico×10
Top 3

How it unfolded

Top 6 · 9 rounds

Tight race until R9; 2 players tied at 8.0/9, decided on Buchholz. Title race narrowed from 2 co-leaders at R4 to 2 at the finish.

Co-leaders
5
3
2
2
1
1
1
1
2
2.54.579R1R2R3R4R5R6R7R8R9
Pedrosa Rivera8Carrion Perez8Rios Maldonado6.5Capeles Mendoza6.5Patel5Ryder3.5
R9 · TIEBREAK CLUSTER

2 players finish on 8.0/9. Carrion Perez takes the title on Buchholz Cut1 (37.0).

R5 · HEAD-TO-HEAD · WINNER VS 2ND

Joshua Pedrosa Rivera lost to Louis E. Carrion Perez (White).

WIN STREAKS · 3 top finishers

Joshua Pedrosa Rivera 4+4 wins (R1–R4, R6–R9)Louis E. Carrion Perez 6 wins (R1–R6)Javier Rios Maldonado 3+3 wins (R3–R5, R7–R9)

Key matchups · top 4

Head-to-head between the four finishers
Player1234
1Joshua Pedrosa Rivera*
0
1
1
2Louis E. Carrion Perez
1
*
1
½
3Javier Rios Maldonado
0
0
*
½
4CMJomar Capeles Mendoza
0
½
½
*

Grille américaine

#PlayerEloFedR1R2R3R4R5R6R7R8R9PtsBu C1BuSBPerfΔ
1Carrion Perez, Louis E.1894PUR+7N+6B+9N+10B+2N+4B=3N+8B=5N8.037.037.031.252056+27.0
2Pedrosa Rivera, Joshua1940PUR+4B+8N+7B+9N−1B+3B+5N+6B+10N8.037.037.029.002053+47.2
3Capeles Mendoza, JomarCM1909PUR+10B=4N+8B+7N+9B−2N=1B+5B=6N6.538.538.521.501849-3.0
4Rios Maldonado, Javier1867PUR−2N=3B+5N+6B+10N−1N+8B+7N+9B6.538.538.519.251851-0.4
5Patel, Yash1776PUR+6B+10N−4B+8N=7B+9N−2B−3N=1B5.040.040.013.501710-29.2
6Ryder, Alexander1523PUR−5N−1N+10B−4N+8B+7N−9B−2N=3B3.541.541.58.751696+48.0
7Ortiz Colon, Vladimir S.1673PUR−1B+9B−2N−3B=5N−6B+10N−4B=8N3.042.042.05.751547-21.4
8Stuart, Sean1541PUR+9N−2B−3N−5B−6N+10B−4N−1N=7B2.542.542.53.501513-19.6
9Ryder, Gabriella0PUR−8B−7N−1B−2B−3N−5B+6N+10B−4N2.043.043.03.5015710.0
10Kiess Alfonso, Erwin S.1600PUR−3N−5B−6N−1N−4B−8N−7B−9N−2B0.043.045.00.00990-35.2

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers
Top rating losers
Biggest upsets