National OPEN Championship 2025

Open SwissStandard

34 players participated in this 7-round tournament, held from 31 Oct 2025 to 08 Nov 2025 in Willemstad, Curacao, Netherlands Antilles. 5 titled players. Top 10 Elo average was 1878, and top seed was Ursus Van Bemmelen ( AHO, FM, 2087).

Oscar Cuellar ( AHO, 1950) won with 6.0/7, ahead of Sherman Maduro (6.0) and Ursus Van Bemmelen (5.5). Cuellar won on tie-break after catching the field in the final round.

The biggest upset came in round 5: Kaylani Jeandor (1477) beat Adriel Cleofa (1684), a +207-point gap.

Location

Willemstad, Curacao, Netherlands Antilles

Dates

31 Oct 2025 → 08 Nov 2025

Time control

Standard: 90 minutes for game with 30 seconds delay from move 1

System

Swiss · 7 rounds

Top seed

FMUrsus Van Bemmelen2087

Avg top 10

1,878

Participants

Titled players · 5

FM×2

CM×2

WCM×1

Federations · 1 represented

Netherlands Antilles×28

Top 3

🥇
Oscar Cuellar
AHO·1950
6.0pts·2097perf+22.4
🥈
CMSherman Maduro
AHO·1996
6.0pts·2122perf+20.2
🥉
FMUrsus Van Bemmelen
AHO·2087
5.5pts·2061perf-2.0

How it unfolded

Top 6 · 7 rounds

Tight race until R7; 2 players tied at 6.0/7, decided on Buchholz. Title race narrowed from 4 co-leaders at R4 to 2 at the finish.

Co-leaders

Cuellar6Maduro6Van Bemmelen5.5Capella5Albregtse5Hodgson5

R7 · TIEBREAK CLUSTER

2 players finish on 6.0/7. Cuellar takes the title on Buchholz Cut1 (28.5).

R4 · HEAD-TO-HEAD · WINNER VS 2ND

Oscar Cuellar drew with CM Sherman Maduro (White).

WIN STREAKS · 2 top finishers

Oscar Cuellar 3 wins (R1–R3)CM Sherman Maduro 3 wins (R1–R3)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Oscar Cuellar	*	½	—	½
2CMSherman Maduro	½	*	1	½
3FMUrsus Van Bemmelen	—	0	*	½
4FMRurik Capella	½	½	½	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	Pts	Bu C1	Bu	SB	Perf	Δ
1	Cuellar, Oscar	1950	AHO	+11N	+5B	+10N	=2B	=4N	+18B	+7N	6.0	28.5	31.5	26.00	2097	+22.4
2	Maduro, ShermanCM	1996	AHO	+20B	+18N	+19B	=1N	+3B	+5N	=4B	6.0	27.5	30.5	25.00	2122	+20.2
3	Van Bemmelen, UrsusFM	2087	AHO	+12N	+7B	=4N	+23B	−2N	+8B	+18N	5.5	27.0	29.5	21.00	2061	-2.0
4	Capella, RurikFM	1912	AHO	+17N	+21B	=3B	+8N	=1B	=6N	=2N	5.0	30.5	33.5	22.25	2031	+19.4
5	Hodgson, Norman	1723	AHO	+29B	−1N	+14B	+20N	+16B	−2B	+11N	5.0	26.5	27.5	15.50	1827	+13.6
6	Albregtse, Tjerk	1798	AHO	+22N	+26B	−8N	+24B	=7N	=4B	+12N	5.0	23.0	25.0	15.75	1840	+6.2
7	Capella, Gregory	1750	AHO	+33B	−3N	+9B	+19N	=6B	+10N	−1B	4.5	28.0	28.0	14.00	1880	+20.2
8	Castro de, Edler	1923	AHO	+14B	=16N	+6B	−4B	+23N	−3N	+15B	4.5	26.5	29.0	16.75	1895	-6.8
9	Pieter, LianaWCM	1657	AHO	+25N	=23B	−7N	−15N	+28B	+17B	+16N	4.5	19.5	21.0	11.75	1658	-0.4
10	Bregita, Jhonathan	1814	AHO	+28B	+15N	−1B	+21N	−18N	−7B	+22N	4.0	23.0	24.5	11.00	1701	-15.8
11	Jeandor, Kaylani	1477	AHO	−1B	+33N	−18B	+25N	+21B	+19N	−5B	4.0	22.0	22.0	8.00	1665	+42.0
12	Ayubi, Amir	1622	AHO	−3B	−19N	+29B	+30N	+15B	+20N	−6B	4.0	21.0	22.0	8.50	1684	+11.2
13	Diaz, Luciano	0	AHO	−18B	+32N	−20B	+14N	+26B	−15N	+19B	4.0	18.5	19.0	9.50	1600	0.0
14	Ajubi, Aiden	0	AHO	−8N	+27B	−5N	−13B	+32N	+31B	+24B	4.0	18.5	19.0	5.50	1023	0.0
15	Wu, Jie-Peng	1712	AHO	+27N	−10B	=17N	+9B	−12N	+13B	−8N	3.5	24.5	26.5	12.25	1561	-31.6
16	Everts, Roy-Anthony	1735	AHO	+30N	=8B	−23N	+17B	−5N	+21B	−9B	3.5	23.0	24.0	9.75	1605	-35.6
17	Bhatia, Kush	0	AHO	−4B	+29N	=15B	−16N	+27B	−9N	+20B	3.5	21.5	22.5	7.75	1577	0.0
18	Bedi, VaibhavCM	1769	AHO	+13N	−2B	+11N	F	+10B	−1N	−3B	3.0	29.5	31.5	12.00	1793	+4.4
19	Diaz de Pool, Xavi	1633	AHO	+24N	+12B	−2N	−7B	+31N	−11B	−13N	3.0	24.5	25.5	7.00	1518	-26.8
20	Rajpal, Hriday	1615	AHO	−2N	+30B	+13N	−5B	+24N	−12B	−17N	3.0	24.5	25.5	7.00	980	-37.2
21	Cleofa, Adriel	1684	AHO	+31B	−4N	+28B	−10B	−11N	−16N	+29B	3.0	19.0	20.0	3.50	935	-68.8
22	Costa, Fabianny	0	AHO	−6B	−31N	−24N	+32B	+25B	+30N	−10B	3.0	15.0	15.5	3.50	1006	-15.2
23	Roose, Alex	1782	AHO	+34B	=9N	+16B	−3N	−8B	F	F	2.5	18.0	18.0	5.75	1764	-3.8
24	Wadhwani, Ronish	0	AHO	−19B	+34N	+22B	−6N	−20B	F	−14N	2.0	20.0	20.0	3.00	882	0.0
25	Rico, Zayra	0	AHO	−9B	−28N	F	−11B	−22N	+27N	+30B	2.0	16.0	16.0	3.00	767	0.0
26	Devnani, Yash	1633	AHO	+32B	−6N	+31B	F	−13N	F	F	2.0	15.5	15.5	1.50	998	-11.2
27	FIDE 7503202	0	—	−15B	−14N	+34B	=28N	−17N	−25B	=32B	2.0	15.0	15.0	1.00	912	0.0
28	FIDE 7502222	0	—	−10N	+25B	−21N	=27B	−9N	−29B	F	1.5	16.5	17.5	3.00	918	0.0
29	FIDE 7503270	0	—	−5N	−17B	−12N	F	−30B	+28N	−21N	1.0	18.0	18.0	1.50	876	0.0
30	FIDE 7503261	0	—	−16B	−20N	F	−12B	+29N	−22B	−25N	1.0	16.5	17.0	1.00	857	0.0
31	Rico, Quinten	0	AHO	−21N	+22B	−26N	F	−19B	−14N	F	1.0	16.5	16.5	3.00	850	0.0
32	FIDE 7502869	0	—	−26N	−13B	F	−22N	−14B	F	=27N	0.5	16.0	16.0	1.00	833	0.0
33	Dunker, Nathan	0	AHO	−7N	−11B	F	F	F	F	F	0.0	11.5	11.5	0.00	814	0.0
34	FIDE 7502885	0	—	−23N	−24B	−27N	F	F	F	F	0.0	7.5	7.5	0.00	982	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Jeandor, KaylaniAHO
+42.0
4.0 pts · #10
2Cuellar, OscarAHO
+22.4
6.0 pts · #1
3Maduro, ShermanCMAHO
+20.2
6.0 pts · #2

Top rating losers

1Cleofa, AdrielAHO
-68.8
3.0 pts · #21
2Rajpal, HridayAHO
-37.2
3.0 pts · #30
3Everts, Roy-AnthonyAHO
-35.6
3.5 pts · #17

Biggest upsets

R5+207 Elo gap
Jeandor, Kaylani1477 beat Cleofa, Adriel1684
R6+156 Elo gap
Jeandor, Kaylani1477 beat Diaz de Pool, Xavi1633