MMB National Chess Open Tournament

Open SwissStandard

41 players participated in this 7-round tournament, held from 09 Nov 2025 to 30 Nov 2025 in Dededo, Guam. 3 titled players. Top 10 Elo average was 1864, and top seed was Tuan An Tran (🇬🇺 GUM, CM, 2036).

Elmer Prudente (🇬🇺 GUM, CM, 1964) won with 7.0/7, ahead of Jefferson A Pascua (5.5) and Tuan An Tran (5.0). Prudente won solo starting round 5.

The biggest upset came in round 4: Esther Combs (1427) beat Steven Tererence Lujan (1806), a +379-point gap.

Location

🇬🇺Dededo, Guam

Dates

09 Nov 2025 → 30 Nov 2025

Time control

Standard: 60 minutes with 30 seconds increment from move 1

System

Swiss · 7 rounds

Top seed

🇬🇺CMTuan An Tran2036

Avg top 10

1,864

Participants

Titled players · 3

CM×2

WCM×1

Federations · 1 represented

🇬🇺Guam×40

Top 3

🥇
CMElmer Prudente
🇬🇺GUM·1964
7.0pts·2584perf+41.4
🥈
Jefferson A Pascua
🇬🇺GUM·1859
5.5pts·1964perf+19.8
🥉
CMTuan An Tran
🇬🇺GUM·2036
5.0pts·1958perf-16.8

How it unfolded

Top 6 · 7 rounds

CM Elmer Prudente led from R5; +1.5-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R5.

Co-leaders

Prudente7Pascua5.5Tran5Combs5Justo5Remetira5

R5–R7 · LEAD HELD

CM Elmer Prudente never relinquished the lead after R5; final gap +1.5 over the runner-up.

R3 · HEAD-TO-HEAD · WINNER VS 2ND

CM Elmer Prudente beat Jefferson A Pascua (White).

WIN STREAKS · 3 top finishers

CM Elmer Prudente 7 wins (R1–R7)Jefferson A Pascua 3 wins (R5–R7)CM Tuan An Tran 4 wins (R1–R4)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1CMElmer Prudente	*	1	1	—
2Jefferson A Pascua	0	*	1	—
3CMTuan An Tran	0	0	*	1
4Daniel Combs	—	—	0	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	Pts	Bu C1	Bu	SB	Perf	Δ
1	Prudente, ElmerCM	1964	GUM	+19B	+14N	+2B	+11N	+3B	+5N	+4B	7.0	28.5	31.5	31.50	2584	+41.4
2	Pascua, Jefferson A	1859	GUM	+22N	+16B	−1N	=12B	+17N	+9B	+3B	5.5	28.0	31.0	22.00	1964	+19.8
3	Tran, Tuan AnCM	2036	GUM	+33N	+10B	+7N	+5B	−1N	+12B	−2N	5.0	30.5	31.5	19.00	1958	-16.8
4	Doria, Daniel	1739	GUM	+27B	+13N	−5B	+19N	+14B	+6B	−1N	5.0	28.0	30.0	18.00	1865	+17.0
5	Justo, James Marcus	1960	GUM	+29N	+34B	+4N	−3N	+11B	−1B	+10N	5.0	27.0	28.0	16.00	1918	-3.2
6	Remetira, Ruel	1941	GUM	+26B	+24N	−11B	+15N	+10B	−4N	+13B	5.0	23.5	25.5	16.50	1756	-45.2
7	Combs, Daniel	1775	GUM	+23B	+15N	−3B	−13N	+19B	+20N	+22B	5.0	22.0	25.0	16.00	1871	+28.4
8	Izsak, Daniel	0	GUM	−10B	−19N	+41B	+26N	+33B	+14N	+24N	5.0	16.5	16.5	9.50	1589	0.0
9	Eliana, Sterling	1736	GUM	=12N	+18B	−10N	+20B	+24N	−2N	+17B	4.5	23.5	26.0	14.50	1744	+3.4
10	Ollet, MyraWCM	1653	GUM	+8N	−3N	+9B	+16B	−6N	+15N	−5B	4.0	28.5	32.5	17.50	1797	+19.4
11	Karamihan, John Francis	1740	GUM	+35N	+17B	+6N	−1B	−5N	+16B	F	4.0	28.5	29.5	13.50	1875	+17.2
12	Santos, Almer	1764	GUM	=9B	+21N	+38B	=2N	+13B	−3N	F	4.0	26.0	27.0	13.00	1858	+9.6
13	Urbano, Ariel	0	GUM	+25N	−4B	+33N	+7B	−12N	+18B	−6N	4.0	25.0	26.0	12.00	1688	0.0
14	Rhodes, James	1584	GUM	+30N	−1B	+29N	+27B	−4N	−8B	+20N	4.0	24.0	26.0	9.00	1691	+16.4
15	Judan, Deomedes	1523	GUM	+28N	−7B	+37N	−6B	+25N	−10B	+27N	4.0	20.5	21.5	7.50	1501	-9.6
16	Justo, Alexis Rian	1581	GUM	+40B	−2N	+26B	−10N	+29B	−11N	+28B	4.0	19.5	19.5	6.00	1577	-4.4
17	Tran, Xuan Chi	1563	GUM	+20B	−11N	=24B	+18N	−2B	+33N	−9N	3.5	23.0	24.0	8.75	1640	+26.4
18	Uherhewar, James Rivera	1533	GUM	=21B	−9N	+32N	−17B	+34B	−13N	+19B	3.5	20.0	21.0	7.50	1717	+48.8
19	Villanueva, Angelo	1503	GUM	−1N	+8B	+34N	−4B	−7N	+35B	−18N	3.0	26.5	27.5	7.00	1477	-10.0
20	Lopatyuk, Leo	1569	GUM	−17N	+35B	+25B	−9N	+27N	−7B	−14B	3.0	21.5	22.5	5.50	1378	-46.4
21	Tran, Tuan Vu	0	GUM	=18N	−12B	−22N	+30B	+26N	−24B	=25N	3.0	17.5	19.5	7.00	1419	0.0
22	Tiurin, Yaroslav	1494	GUM	−2B	−36N	+21B	+37N	+31B	F	−7N	3.0	17.5	17.5	6.00	1017	-10.4
23	Arevalo Jr., Fernando O	1465	GUM	−7N	−37B	+30N	+28B	F	F	+40N	3.0	10.0	10.0	4.00	975	-5.6
24	Mortensen, John Michael	1552	GUM	+41N	−6B	=17N	F	−9B	+21N	−8B	2.5	22.0	22.0	4.75	1475	-14.0
25	Combs, Esther	1427	GUM	−13B	+39B	−20N	+38N	−15B	−28N	=21B	2.5	17.0	18.0	3.50	1507	+9.6
26	Long, David	1494	GUM	−6N	+30B	−16N	−8B	−21B	+31N	F	2.0	21.0	22.0	4.00	939	-18.4
27	Caceres, Calvin	0	GUM	−4N	+28B	F	−14N	−20B	+29N	−15B	2.0	20.0	21.0	4.00	1344	0.0
28	Wang, Travis	0	GUM	−15B	−27N	+31B	−23N	F	+25B	−16N	2.0	17.5	18.5	4.50	1307	0.0
29	Chattaraj, Aranyam	1495	GUM	−5B	+40N	−14B	+35N	−16N	−27B	F	2.0	17.0	17.0	1.00	891	-32.8
30	Jung, Hawoon	0	GUM	−14B	−26N	−23B	−21N	F	+34N	+33B	2.0	14.0	15.0	2.00	1463	0.0
31	Jang, David	0	GUM	−34N	−33B	−28N	+41B	−22N	−26B	+39N	2.0	10.0	10.0	1.00	729	0.0
32	Cedeno, Antonio	1792	GUM	F	−38N	−18B	+39N	F	+36N	F	2.0	7.5	7.5	2.00	869	-52.0
33	Combs, Mylen Rodriguez	1520	GUM	−3B	+31N	−13B	F	−8N	−17B	−30N	1.0	21.5	22.5	2.00	928	-19.2
34	Rombaua, Bellan	1627	GUM	+31B	−5N	−19B	F	−18N	−30B	F	1.0	18.0	18.0	2.00	864	-57.6
35	FIDE 31006698	0	—	−11B	−20N	+40B	−29B	F	−19N	F	1.0	16.0	16.0	0.00	778	0.0
36	Adams, Michael	0	GUM	F	+22B	F	F	F	−32B	F	1.0	12.0	12.0	3.00	1644	0.0
37	Membrere, Tony	0	GUM	F	+23N	−15B	−22B	F	F	F	1.0	10.0	10.0	3.00	1370	0.0
38	Lujan, Steven Tererence	1806	GUM	F	+32B	−12N	−25B	F	F	F	1.0	8.5	8.5	2.00	1535	-39.6
39	Lee, Hajung	0	GUM	F	−25N	F	−32B	F	+41N	−31B	1.0	8.5	8.5	0.00	808	0.0
40	Jung, Juliet Seo	0	GUM	−16N	−29B	−35N	F	F	F	−23B	0.0	14.0	14.0	0.00	714	0.0
41	Peralta, Emyr	0	GUM	−24B	F	−8N	−31N	F	−39B	F	0.0	11.5	11.5	0.00	756	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Uherhewar, James RiveraGUM
+48.8
3.5 pts · #14
2Prudente, ElmerCMGUM
+41.4
7.0 pts · #1
3Combs, DanielGUM
+28.4
5.0 pts · #4

Top rating losers

1Rombaua, BellanGUM
-57.6
1.0 pts · #36
2Cedeno, AntonioGUM
-52.0
2.0 pts · #35
3Lopatyuk, LeoGUM
-46.4
3.0 pts · #26

Biggest upsets

R4+379 Elo gap
Combs, Esther1427 beat Lujan, Steven Tererence1806
R3+259 Elo gap
Uherhewar, James Rivera1533 beat Cedeno, Antonio1792
R6+202 Elo gap
Doria, Daniel1739 beat Remetira, Ruel1941