I Open CRChess-Montes de Oca 2025 - Grupo B
Open SwissStandard
43 players participated in this 7-round tournament, held from 13 Dec 2025 to 15 Dec 2025 in Montes de Oca, Costa Rica. 2 titled players. Top 10 Elo average was 1723, and top seed was Christopher Lezcano Martinez (🇨🇷 CRC, 1772).
Moises Alonso Romero Cerdas (🇨🇷 CRC, 1606) won with 6.5/7, ahead of Brenda Semana Ramirez (6.0) and Christopher Lezcano Martinez (5.5). Romero Cerdas shared the lead from round 4 and won solo starting round 5.
The biggest upset came in round 7: Daniel Peraza Cedrez (1453) beat Caleb Josue Villalobos Molina (1747), a +294-point gap.
Location
🇨🇷Montes de Oca, Costa Rica
Dates
13 Dec 2025 → 15 Dec 2025
Time control
Standard: 60 minutes with 30 seconds increment from move 1
System
Swiss · 7 rounds
Titled players · 2
WCM×2
Federations · 1 represented
🇨🇷Costa Rica×42
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 7 roundsMoises Alonso Romero Cerdas led from R5; +0.5-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R5.
Co-leaders
18
10
4
2
1
1
1
R5–R7 · LEAD HELD
Moises Alonso Romero Cerdas held the sole lead from R5 through R7 without losing it.
WIN STREAKS · 3 top finishers
Moises Alonso Romero Cerdas 6 wins (R1–R6)WCM Brenda Semana Ramirez 4 wins (R4–R7)Christopher Lezcano Martinez 4 wins (R1–R4)
Key matchups · top 4
Head-to-head between the four finishersGrille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | R6 | R7 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Romero Cerdas, Moises Alonso | 1606 | CRC | +43N | +25B | +14N | +7N | +3B | +13B | =4N | 6.5 | 26.0 | 26.0 | 23.25 | 2102 | +129.2 |
| 2 | Semana Ramirez, BrendaWCM | 1635 | CRC | +32B | +38N | −3N | +10B | +21N | +16B | +8N | 6.0 | 23.0 | 24.0 | 18.50 | 1869 | +67.2 |
| 3 | Lezcano Martinez, Christopher | 1772 | CRC | +31B | +12N | +2B | +4N | −1N | =8B | +13N | 5.5 | 30.5 | 32.5 | 23.75 | 1853 | +22.4 |
| 4 | Bustamante Gonzalez, Carlos Andres | 1686 | CRC | +20N | +10B | +9N | −3B | +18B | +5N | =1B | 5.5 | 29.0 | 32.5 | 23.75 | 1853 | +28.4 |
| 5 | Stawski Oliva, Andres | 1751 | CRC | =16N | +19B | =27N | +9B | +6N | −4B | +10N | 5.0 | 26.0 | 28.5 | 20.00 | 1774 | +11.6 |
| 6 | Rivera Mora, Gabriel | 1622 | CRC | +37B | +28N | −7B | +35N | −5B | +22N | +15B | 5.0 | 20.5 | 21.5 | 12.00 | 1732 | +23.2 |
| 7 | Arguedas Gomez, Jeferson Antonio | 1697 | CRC | +35N | +11B | +6N | −1B | −13B | =18N | +17B | 4.5 | 26.5 | 28.0 | 15.75 | 1673 | -6.8 |
| 8 | Elizalde Brisuela, Eduardo | 1638 | CRC | −27N | +26B | +20N | +11B | +22B | =3N | −2B | 4.5 | 24.5 | 27.0 | 15.75 | 1653 | +3.0 |
| 9 | Cadena Diaz, Mateo | 1608 | CRC | +42B | +41N | −4B | −5N | +23B | =17N | +11B | 4.5 | 22.0 | 22.5 | 10.25 | 1647 | +10.4 |
| 10 | Bermudez Arce, Ximena Sofia | 1596 | CRC | +29B | −4N | +39B | −2N | +30B | +12N | −5B | 4.0 | 25.0 | 26.0 | 9.50 | 1650 | +10.8 |
| 11 | Viquez Alfaro, Gabriel | 1600 | CRC | +36B | −7N | +17B | −8N | +29N | +21B | −9N | 4.0 | 23.0 | 24.5 | 11.00 | 1523 | -14.0 |
| 12 | Corrales Corrales, Ana Maria | 1611 | CRC | +23N | −3B | +29N | −21B | +26N | −10B | +16N | 4.0 | 22.0 | 24.5 | 11.50 | 1515 | -26.8 |
| 13 | Meneses Castro, Jose Alejandro | 1598 | CRC | +40N | +33B | F | +27B | +7N | −1N | −3B | 4.0 | 22.0 | 22.0 | 10.00 | 1718 | +28.4 |
| 14 | Chacon Saborio, Eduardo | 1684 | CRC | +34B | +22N | −1B | −18N | =20B | +28N | =29N | 4.0 | 21.5 | 23.5 | 10.50 | 1612 | -20.0 |
| 15 | Pozo Miranda, Camila | 1628 | CRC | +26N | −27B | +23N | =16B | +25N | =19B | −6N | 4.0 | 20.0 | 22.5 | 11.50 | 1598 | +46.4 |
| 16 | Dodaro Gamez, Alessandro | 1547 | CRC | =5B | =17N | +38B | =15N | +27B | −2N | −12B | 3.5 | 25.0 | 26.0 | 9.75 | 1508 | -22.0 |
| 17 | Soto Rivera, Matias | 1494 | CRC | =19N | =16B | −11N | +42B | +33N | =9B | −7N | 3.5 | 22.0 | 22.5 | 8.25 | 1587 | +25.2 |
| 18 | Hidalgo Mendez, Emilio | 1546 | CRC | −25N | +43B | F | +14B | −4N | =7B | +19N | 3.5 | 22.0 | 22.0 | 9.75 | 1706 | +42.4 |
| 19 | Flores Elizondo, Mathias | 1710 | CRC | =17B | −5N | +31B | =28N | +35B | =15N | −18B | 3.5 | 20.5 | 22.0 | 8.50 | 1574 | -51.6 |
| 20 | Fernandez Mayorga, ElenaWCM | 1473 | CRC | −4B | +36N | −8B | +38N | =14N | −24B | +31N | 3.5 | 20.5 | 21.5 | 6.50 | 1473 | +5.6 |
| 21 | Young Zhou, Jason | 1513 | CRC | −41B | +37N | +28B | +12N | −2B | −11N | =26B | 3.5 | 20.0 | 21.0 | 8.75 | 1564 | +10.8 |
| 22 | Ramos Chavez, Jose Andres | 1528 | CRC | F | −14B | +33N | +25B | −8N | −6B | +24N | 3.0 | 21.0 | 23.0 | 7.50 | 1662 | +42.8 |
| 23 | Chaves Rivera, Dominic Gael | 0 | CRC | −12B | +31N | −15B | +43N | −9N | =25B | =32N | 3.0 | 19.0 | 19.0 | 4.25 | 1443 | 0.0 |
| 24 | Perez Rojas, Nicolas | 1540 | CRC | −28B | +32N | −25N | −26B | +36B | +20N | −22B | 3.0 | 16.0 | 17.5 | 7.00 | 1433 | -36.0 |
| 25 | Villalobos Molina, Caleb Josue | 1747 | CRC | +18B | −1N | +24B | −22N | −15B | =23N | −34B | 2.5 | 23.0 | 25.0 | 8.00 | 1397 | -107.2 |
| 26 | Mora Acuna, Johnny Gabriel | 1443 | CRC | −15B | −8N | +36B | +24N | −12B | F | =21N | 2.5 | 21.0 | 22.5 | 6.25 | 1404 | -12.4 |
| 27 | Leiva Calvo, Luis Fernando | 1445 | CRC | +8B | +15N | =5B | −13N | −16N | F | F | 2.5 | 21.0 | 21.0 | 11.00 | 1605 | +19.6 |
| 28 | Hincapie Salazar, Daniel | 1731 | CRC | +24N | −6B | −21N | =19B | +39N | −14B | F | 2.5 | 20.0 | 20.0 | 5.75 | 1545 | -60.8 |
| 29 | Contreras Guzman, Denzel | 0 | CRC | −10N | F | −12B | +39N | −11B | +35N | =14B | 2.5 | 18.5 | 18.5 | 4.50 | 1519 | 0.0 |
| 30 | Guadamuz Hernandez, Ismael A | 1729 | CRC | F | +34N | F | +32B | −10N | F | F | 2.0 | 17.0 | 17.0 | 4.00 | 1632 | -6.4 |
| 31 | Leguizamon Santamaria, Daniel A | 1555 | CRC | −3N | −23B | −19N | F | +43B | +40N | −20B | 2.0 | 16.5 | 16.5 | 1.00 | 848 | -23.0 |
| 32 | Corrales Corrales, Fidel | 1444 | CRC | −2N | −24B | F | −30N | =40B | +37N | =23B | 2.0 | 16.0 | 16.0 | 3.00 | 835 | -31.2 |
| 33 | Morales Vasquez, Thiago Marcel | 1689 | CRC | +39B | −13N | −22B | +37N | −17B | F | F | 2.0 | 12.5 | 12.5 | 2.00 | 1340 | -74.0 |
| 34 | Peraza Cedrez, Daniel | 1453 | CRC | −14N | −30B | F | −36N | F | +42B | +25N | 2.0 | 11.0 | 11.0 | 3.00 | 1595 | +9.0 |
| 35 | Tolokonnikov, Roman | 1488 | CRC | −7B | +42N | F | −6B | −19N | −29B | =36N | 1.5 | 18.0 | 18.5 | 1.25 | 891 | -28.4 |
| 36 | Brenes Sequeira, Rafael Jesus | 0 | CRC | −11N | −20B | −26N | +34B | −24N | F | =35B | 1.5 | 16.5 | 16.5 | 2.75 | 1300 | 0.0 |
| 37 | Herrera Cordoba, Cala | 0 | CRC | −6N | −21B | +40N | −33B | F | −32B | F | 1.0 | 13.5 | 13.5 | 1.00 | 780 | 0.0 |
| 38 | Walters Chaves, Ethan | 0 | CRC | F | −2B | −16N | −20B | +42N | F | F | 1.0 | 13.5 | 13.5 | 0.50 | 750 | 0.0 |
| 39 | Alfaro Letendre, Benjamin | 1485 | CRC | −33N | +40B | −10N | −29B | −28B | F | F | 1.0 | 12.0 | 12.0 | 1.00 | 882 | -29.6 |
| 40 | Briones Jarry, Ivan | 0 | CRC | −13B | −39N | −37B | F | =32N | −31B | =42N | 1.0 | 10.5 | 10.5 | 1.25 | 1203 | 0.0 |
| 41 | Rivas Calderon, Victor Julio | 1721 | CRC | +21N | −9B | F | F | F | F | F | 1.0 | 9.5 | 9.5 | 3.50 | 1566 | -8.4 |
| 42 | Zhou Fernandez, Isabella | 0 | CRC | −9N | −35B | F | −17N | −38B | −34N | =40B | 0.5 | 14.5 | 15.5 | 0.50 | 715 | 0.0 |
| 43 | FIDE 6569609 | 0 | — | −1B | −18N | F | −23B | −31N | F | F | 0.0 | 17.0 | 17.0 | 0.00 | 771 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Romero Cerdas, Moises AlonsoCRC+129.26.5 pts · #2
- 2Semana Ramirez, BrendaWCMCRC+67.26.0 pts · #4
- 3Pozo Miranda, CamilaCRC+46.44.0 pts · #12
Top rating losers
- 1Villalobos Molina, Caleb JosueCRC-107.22.5 pts · #27
- 2Morales Vasquez, Thiago MarcelCRC-74.02.0 pts · #34
- 3Hincapie Salazar, DanielCRC-60.82.5 pts · #16
Biggest upsets
- R7+294 Elo gap
- R4+219 Elo gap
- R3+218 Elo gap