CChessStats

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 (πŸ‡¨πŸ‡· CRC, 1772).

Moises Alonso Romero Cerdas (πŸ‡¨πŸ‡· 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
πŸ‡¨πŸ‡·Montes de Oca, Costa Rica
Dates
13 Dec 2025 β†’ 15 Dec 2025
Time control
Standard: 60 minutes with 30 seconds increment from move 1
System
Swiss Β· 7 rounds
Top seed
πŸ‡¨πŸ‡·Christopher Lezcano Martinez1772
Avg top 10
1,723
Participants
43
Titled players Β· 2
WCMΓ—2
Federations Β· 1 represented
πŸ‡¨πŸ‡·Costa RicaΓ—42
Top 3

How it unfolded

Top 6 Β· 7 rounds

Moises 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
23.55.57R1R2R3R4R5R6R7
Romero Cerdas6.5Semana Ramirez6Lezcano Martinez5.5Bustamante Gonzalez5.5Stawski Oliva5Rivera Mora5
R5–R7 Β· LEAD HELD

Moises Alonso Romero Cerdas held the sole lead from R5 through R7 without losing it.

WIN STREAKS Β· 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 Β· top 4

Head-to-head between the four finishers
Player1234
1Moises Alonso Romero Cerdas*β€”
1
Β½
2WCMBrenda Semana Ramirezβ€”*
0
β€”
3Christopher Lezcano Martinez
0
1
*
1
4Carlos Andres Bustamante Gonzalez
Β½
β€”
0
*

Grille amΓ©ricaine

#PlayerEloFedR1R2R3R4R5R6R7PtsBu C1BuSBPerfΞ”
1Romero Cerdas, Moises Alonso1606CRC+43N+25B+14N+7N+3B+13B=4N6.526.026.023.252102+129.2
2Semana Ramirez, BrendaWCM1635CRC+32B+38Nβˆ’3N+10B+21N+16B+8N6.023.024.018.501869+67.2
3Lezcano Martinez, Christopher1772CRC+31B+12N+2B+4Nβˆ’1N=8B+13N5.530.532.523.751853+22.4
4Bustamante Gonzalez, Carlos Andres1686CRC+20N+10B+9Nβˆ’3B+18B+5N=1B5.529.032.523.751853+28.4
5Stawski Oliva, Andres1751CRC=16N+19B=27N+9B+6Nβˆ’4B+10N5.026.028.520.001774+11.6
6Rivera Mora, Gabriel1622CRC+37B+28Nβˆ’7B+35Nβˆ’5B+22N+15B5.020.521.512.001732+23.2
7Arguedas Gomez, Jeferson Antonio1697CRC+35N+11B+6Nβˆ’1Bβˆ’13B=18N+17B4.526.528.015.751673-6.8
8Elizalde Brisuela, Eduardo1638CRCβˆ’27N+26B+20N+11B+22B=3Nβˆ’2B4.524.527.015.751653+3.0
9Cadena Diaz, Mateo1608CRC+42B+41Nβˆ’4Bβˆ’5N+23B=17N+11B4.522.022.510.251647+10.4
10Bermudez Arce, Ximena Sofia1596CRC+29Bβˆ’4N+39Bβˆ’2N+30B+12Nβˆ’5B4.025.026.09.501650+10.8
11Viquez Alfaro, Gabriel1600CRC+36Bβˆ’7N+17Bβˆ’8N+29N+21Bβˆ’9N4.023.024.511.001523-14.0
12Corrales Corrales, Ana Maria1611CRC+23Nβˆ’3B+29Nβˆ’21B+26Nβˆ’10B+16N4.022.024.511.501515-26.8
13Meneses Castro, Jose Alejandro1598CRC+40N+33BF+27B+7Nβˆ’1Nβˆ’3B4.022.022.010.001718+28.4
14Chacon Saborio, Eduardo1684CRC+34B+22Nβˆ’1Bβˆ’18N=20B+28N=29N4.021.523.510.501612-20.0
15Pozo Miranda, Camila1628CRC+26Nβˆ’27B+23N=16B+25N=19Bβˆ’6N4.020.022.511.501598+46.4
16Dodaro Gamez, Alessandro1547CRC=5B=17N+38B=15N+27Bβˆ’2Nβˆ’12B3.525.026.09.751508-22.0
17Soto Rivera, Matias1494CRC=19N=16Bβˆ’11N+42B+33N=9Bβˆ’7N3.522.022.58.251587+25.2
18Hidalgo Mendez, Emilio1546CRCβˆ’25N+43BF+14Bβˆ’4N=7B+19N3.522.022.09.751706+42.4
19Flores Elizondo, Mathias1710CRC=17Bβˆ’5N+31B=28N+35B=15Nβˆ’18B3.520.522.08.501574-51.6
20Fernandez Mayorga, ElenaWCM1473CRCβˆ’4B+36Nβˆ’8B+38N=14Nβˆ’24B+31N3.520.521.56.501473+5.6
21Young Zhou, Jason1513CRCβˆ’41B+37N+28B+12Nβˆ’2Bβˆ’11N=26B3.520.021.08.751564+10.8
22Ramos Chavez, Jose Andres1528CRCFβˆ’14B+33N+25Bβˆ’8Nβˆ’6B+24N3.021.023.07.501662+42.8
23Chaves Rivera, Dominic Gael0CRCβˆ’12B+31Nβˆ’15B+43Nβˆ’9N=25B=32N3.019.019.04.2514430.0
24Perez Rojas, Nicolas1540CRCβˆ’28B+32Nβˆ’25Nβˆ’26B+36B+20Nβˆ’22B3.016.017.57.001433-36.0
25Villalobos Molina, Caleb Josue1747CRC+18Bβˆ’1N+24Bβˆ’22Nβˆ’15B=23Nβˆ’34B2.523.025.08.001397-107.2
26Mora Acuna, Johnny Gabriel1443CRCβˆ’15Bβˆ’8N+36B+24Nβˆ’12BF=21N2.521.022.56.251404-12.4
27Leiva Calvo, Luis Fernando1445CRC+8B+15N=5Bβˆ’13Nβˆ’16NFF2.521.021.011.001605+19.6
28Hincapie Salazar, Daniel1731CRC+24Nβˆ’6Bβˆ’21N=19B+39Nβˆ’14BF2.520.020.05.751545-60.8
29Contreras Guzman, Denzel0CRCβˆ’10NFβˆ’12B+39Nβˆ’11B+35N=14B2.518.518.54.5015190.0
30Guadamuz Hernandez, Ismael A1729CRCF+34NF+32Bβˆ’10NFF2.017.017.04.001632-6.4
31Leguizamon Santamaria, Daniel A1555CRCβˆ’3Nβˆ’23Bβˆ’19NF+43B+40Nβˆ’20B2.016.516.51.00848-23.0
32Corrales Corrales, Fidel1444CRCβˆ’2Nβˆ’24BFβˆ’30N=40B+37N=23B2.016.016.03.00835-31.2
33Morales Vasquez, Thiago Marcel1689CRC+39Bβˆ’13Nβˆ’22B+37Nβˆ’17BFF2.012.512.52.001340-74.0
34Peraza Cedrez, Daniel1453CRCβˆ’14Nβˆ’30BFβˆ’36NF+42B+25N2.011.011.03.001595+9.0
35Tolokonnikov, Roman1488CRCβˆ’7B+42NFβˆ’6Bβˆ’19Nβˆ’29B=36N1.518.018.51.25891-28.4
36Brenes Sequeira, Rafael Jesus0CRCβˆ’11Nβˆ’20Bβˆ’26N+34Bβˆ’24NF=35B1.516.516.52.7513000.0
37Herrera Cordoba, Cala0CRCβˆ’6Nβˆ’21B+40Nβˆ’33BFβˆ’32BF1.013.513.51.007800.0
38Walters Chaves, Ethan0CRCFβˆ’2Bβˆ’16Nβˆ’20B+42NFF1.013.513.50.507500.0
39Alfaro Letendre, Benjamin1485CRCβˆ’33N+40Bβˆ’10Nβˆ’29Bβˆ’28BFF1.012.012.01.00882-29.6
40Briones Jarry, Ivan0CRCβˆ’13Bβˆ’39Nβˆ’37BF=32Nβˆ’31B=42N1.010.510.51.2512030.0
41Rivas Calderon, Victor Julio1721CRC+21Nβˆ’9BFFFFF1.09.59.53.501566-8.4
42Zhou Fernandez, Isabella0CRCβˆ’9Nβˆ’35BFβˆ’17Nβˆ’38Bβˆ’34N=40B0.514.515.50.507150.0
43FIDE 65696090β€”βˆ’1Bβˆ’18NFβˆ’23Bβˆ’31NFF0.017.017.00.007710.0

Key insights

Biggest movers and upsets β€” the story behind the numbers.

Top rating gainers
Top rating losers
Biggest upsets
I Open CRChess-Montes de Oca 2025 - Grupo B β€” Montes de Oca, Costa Rica | Chess Tournament Results | ChessStats