Chessfestival Groningen 2025 Open B

Open SwissStandard

53 players participated in this 9-round tournament, held from 21 Dec 2025 to 30 Dec 2025 in Groningen, Netherlands. 1 titled players from 4 federations. Top 10 Elo average was 2011, and top seed was Gertjan Haan (🇳🇱 NED, 2033).

Oscar Zecha (🇳🇱 NED, 1982) won with 8.0/9, ahead of Nauanova Zhaniya (6.5) and Joaquin Aarts (6.5). Zecha took the lead from round 7.

The biggest upset came in round 8: Anumitra Elangkumaran (1688) beat Uwe Ritter (1939), a +251-point gap.

Location

🇳🇱Groningen, Netherlands

Dates

21 Dec 2025 → 30 Dec 2025

Time control

Standard: 90min/40moves+30min/end+30sec increment per move starting from move 1

System

Swiss · 9 rounds

Top seed

🇳🇱Gertjan Haan2033

Avg top 10

2,011

Participants

Titled players · 1

WFM×1

Federations · 4 represented

🇳🇱Netherlands×47

🇩🇪Germany×4

🇧🇪Belgium×1

🇰🇿Kazakhstan×1

Top 3

🥇
Oscar Zecha
🇳🇱NED·1982
8.0pts·2272perf+110.8
🥈
WFMNauanova Zhaniya
🇰🇿KAZ·1910
6.5pts·2138perf+104.9
🥉
Joaquin Aarts
🇳🇱NED·2025
6.5pts·2119perf+22.4

How it unfolded

Top 6 · 9 rounds

Oscar Zecha led from R7; +1.5-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R7.

Co-leaders

Zecha8Zhaniya6.5Aarts6.5Thijssen6.5Baarspul6.5Jelic6

R7 · LEADER CHANGE28 Dec

Oscar Zecha takes the sole lead (6.0/7).

R4 · HEAD-TO-HEAD · WINNER VS 2ND

Oscar Zecha lost to WFM Nauanova Zhaniya (White).

WIN STREAKS · 2 top finishers

Oscar Zecha 3+5 wins (R1–R3, R5–R9)WFM Nauanova Zhaniya 4 wins (R1–R4)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Oscar Zecha	*	0	1	—
2WFMNauanova Zhaniya	1	*	—	1
3Joaquin Aarts	0	—	*	—
4Freek Thijssen	—	0	—	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Zecha, Oscar	1982	NED	+20N	+52B	+45N	−2B	+42N	+3N	+11B	+4B	+6N	8.0	40.5	41.5	35.00	2272	+110.8
2	Nauanova ZhaniyaWFM	1910	KAZ	+53B	+5B	+10N	+1N	=9B	+11N	−4N	=6B	=7N	6.5	49.0	50.0	34.75	2138	+104.9
3	Aarts, Joaquin	2025	NED	+32N	+22B	−4N	+6B	+7N	−1B	=14N	+17B	+10N	6.5	46.5	50.5	33.50	2119	+22.4
4	Baarspul, Bram	1943	NED	+46B	+33N	+3B	−11B	=12N	+30N	+2B	−1N	+9B	6.5	44.5	47.0	31.50	2120	+86.0
5	Thijssen, Freek	2027	NED	+39B	−2N	+37B	=9N	+29B	−6N	+26B	+19N	+11B	6.5	39.5	43.0	27.75	2089	+30.0
6	Jelic, Bruno	1975	NED	+28B	+21N	=9B	−3N	+45B	+5B	+12N	=2N	−1B	6.0	46.5	49.0	28.50	2068	+22.4
7	Koppenens, Oscar	1963	NED	+50N	+13B	−11N	+36B	−3B	+43N	=9B	+27N	=2B	6.0	39.0	41.0	23.50	2034	+34.4
8	Nies, Levi	1939	NED	+41N	−45B	+22N	+13B	+14N	−12B	+15N	−10B	+24B	6.0	38.0	40.5	27.50	2032	+22.6
9	Van t Hoff, Tom	2032	NED	+31N	+38B	=6N	=5B	=2N	=15B	=7N	+12B	−4N	5.5	45.5	49.0	27.50	2039	+2.2
10	Haan, Gertjan	2033	NED	+27B	=42N	−2B	+49N	=16B	=26N	+21B	+8N	−3B	5.5	39.5	41.5	22.50	1998	-8.2
11	Blom, Rens	2016	NED	+37B	+23N	+7B	+4N	F	−2B	−1N	+14B	−5N	5.0	46.5	46.5	25.50	2042	+5.4
12	Ellenbroek, Ton	2010	NED	=36N	+51B	=17N	+24B	=4B	+8N	−6B	−9N	=18B	5.0	42.0	44.0	22.50	1982	-7.4
13	Jorritsma, Eli Alia	1796	NED	+16B	−7N	+23B	−8N	=27B	=24N	=30B	+36N	=19B	5.0	39.0	42.5	21.75	1961	+78.8
14	Huiskes, Mathijs	1984	NED	+49B	=26N	=42B	+19N	−8B	+16N	=3B	−11N	=27B	5.0	38.5	40.5	20.75	1979	-1.8
15	Kastelijn, Twan	1994	NED	−22N	+34B	=21N	+20B	+26B	=9N	−8B	−18N	+29B	5.0	38.0	42.0	21.50	1941	-13.4
16	Rookus, Sjoerd	1939	NED	−13N	+50B	=20N	+32B	=10N	−14B	=22N	+28B	=17N	5.0	37.5	39.5	19.75	1938	-0.8
17	Zuiderweg, Edwin	1959	NED	=43B	+44N	=12B	−26N	+39B	=21N	+40B	−3N	=16B	5.0	35.0	38.0	18.75	1927	-7.8
18	Elferink, Leon	2004	NED	−21B	=49N	−28B	+33N	F	+32B	+20N	+15B	=12N	5.0	33.0	33.0	21.00	1990	-3.2
19	Heikamp, Hendrik	1925	NED	−45N	+46B	+52N	−14B	=36N	+42B	+31N	−5B	=13N	5.0	32.0	33.0	14.75	1925	-0.8
20	Timmer, Michel	1860	NED	−1B	+25N	=16B	−15N	+50B	=23N	−18B	+37N	=21B	4.5	40.0	42.0	17.00	1928	+16.4
21	Morsch, Tjeerd	1867	NED	+18N	−6B	=15B	F	+38N	=17B	−10N	+31B	=20N	4.5	38.5	38.5	19.75	1998	+58.0
22	De Vries, Arjan	1865	NED	+15B	−3N	−8B	−29N	+44B	+39N	=16B	−30N	+47N	4.5	37.0	39.5	16.50	1915	+12.0
23	Brand, Niels	1895	NED	+48N	−11B	−13N	+52B	=28N	=20B	=43B	+40N	F	4.5	31.5	32.5	12.75	1884	-2.2
24	Kolijn, David	1894	NED	=44B	=43N	+33B	−12N	F	=13B	+42N	+47B	−8N	4.5	31.5	31.5	15.00	1925	+14.0
25	Etienne, Ghilon	1970	NED	−52N	−20B	+46N	F	−40B	+49N	=29B	+43N	+26B	4.5	24.5	24.5	13.50	1879	-37.6
26	Manenschijn, Wouter	1894	NED	+35N	=14B	=36N	+17B	−15N	=10B	−5N	=33B	−25N	4.0	39.5	43.0	18.00	1886	-1.0
27	Visser, Berend	1884	NED	−10N	+41B	+48N	−42B	=13N	+28B	F	−7B	=14N	4.0	35.5	38.0	15.00	1891	+1.6
28	Schwenke, Stefan	1850	GER	−6N	=47B	+18N	=38B	=23B	−27N	+45B	−16N	=31N	4.0	34.5	37.0	14.75	1875	+6.6
29	Van den Burg, Ralf	1803	NED	−42N	=31B	+47N	+22B	−5N	−36B	=25N	+46B	−15N	4.0	33.5	36.0	13.75	1883	+19.4
30	Geboers, Jimmy	1949	BEL	=34N	−36B	+51N	F	+37B	−4B	=13N	+22B	F	4.0	33.5	33.5	14.50	1906	-7.8
31	Schoffelmeer, Jetse	1881	NED	−9B	=29N	+40B	−43N	+49B	+45N	−19B	−21N	=28B	4.0	32.0	34.0	12.00	1816	-15.6
32	Dijkstra, Edwin	1877	NED	−3B	=40N	+44B	−16N	F	−18N	=48B	+45N	+43B	4.0	31.0	31.0	11.50	1857	-8.8
33	Van Haaften, Jelle	1838	NED	+47N	−4B	−24N	−18B	F	+52N	+37B	=26N	=35B	4.0	31.0	31.0	11.00	1888	+22.0
34	Mastop, Guido	1814	NED	=30B	−15N	−49B	=44N	=53N	=51B	=41N	=38B	+50N	4.0	25.0	26.0	10.50	1815	+0.8
35	Elangkumaran, Anumitra	1688	NED	−26B	−37N	−50N	F	=46B	+44N	+49B	+42B	=33N	4.0	24.0	24.0	11.25	1849	+67.2
36	Kompaan, Rick	1870	NED	=12B	+30N	=26B	−7N	=19B	+29N	F	−13B	F	3.5	37.0	37.0	15.00	1906	+7.0
37	Damen, Josephine	1872	NED	−11N	+35B	−5N	+48B	−30N	=38B	−33N	−20B	+52N	3.5	34.0	35.0	9.25	1798	-36.8
38	De Freytas, Paul	1930	NED	+40B	−9N	=43B	=28N	−21B	=37N	−47B	=34N	=39B	3.5	31.5	34.0	12.50	1797	-33.2
39	Almefalani, Abdulhay	1879	NED	−5N	−48B	+41N	+50B	−17N	−22B	−46N	+44B	=38N	3.5	31.0	33.0	10.25	1779	-50.0
40	Groeneveld, Henry	1783	NED	−38N	=32B	−31N	+47B	+25N	+48B	−17N	−23B	F	3.5	30.5	30.5	11.50	1862	+15.6
41	Belien, Roan	1805	NED	−8B	−27N	−39B	F	−48N	+50N	=34B	+51N	+42B	3.5	27.0	27.0	9.00	1816	+1.6
42	Ritter, Uwe	1939	GER	+29B	=10B	=14N	+27N	−1B	−19N	−24B	−35N	−41N	3.0	40.0	43.5	13.25	1764	-41.6
43	Bruening, Martin	1824	GER	=17N	=24B	=38N	+31B	F	−7B	=23N	−25B	−32N	3.0	36.0	36.0	12.75	1834	+1.2
44	Kollen, Luca	1738	NED	=24N	−17B	−32N	=34B	−22N	−35B	+53N	−39N	+49B	3.0	31.5	32.5	7.25	1722	-4.0
45	Koelmans, Jan Willem	1783	NED	+19B	+8N	−1B	F	−6N	−31B	−28N	−32B	=46N	2.5	39.5	39.5	12.25	1765	-3.8
46	Nair, Pranav Prasobh	1809	NED	−4N	−19N	−25B	=51B	=35N	F	+39B	−29N	=45B	2.5	32.0	32.0	7.75	1712	-46.4
47	Van Dam, Joost	1968	NED	−33B	=28N	−29B	−40N	F	+53B	+38N	−24N	−22B	2.5	29.0	29.0	6.50	1702	-56.6
48	Bosveld, Mattias	1757	NED	−23B	+39N	−27B	−37N	+41B	−40N	=32N	−50B	F	2.5	28.5	28.5	9.00	1712	-8.8
49	Balde, Esko	1860	NED	−14N	=18B	+34N	−10B	−31N	−25B	−35N	=53B	−44N	2.0	35.0	36.0	7.00	1657	-92.0
50	Dekker, Albert	1826	NED	−7B	−16N	+35B	−39N	−20N	−41B	F	+48N	−34B	2.0	33.0	33.0	6.50	1645	-37.8
51	Andriessen, Bart Jan	1835	NED	F	−12N	−30B	=46N	F	=34N	+52B	−41B	F	2.0	21.0	21.0	4.25	1748	-13.8
52	Broekman, Roel	1840	NED	+25B	−1N	−19B	−23N	F	−33B	−51N	F	−37B	1.0	31.5	31.5	4.50	1593	-38.0
53	Bacaksiz, Bilal	1782	GER	−2N	F	F	F	=34B	−47N	−44B	=49N	F	1.0	20.0	20.0	3.00	1618	-20.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Zecha, OscarNED
+110.8
8.0 pts · #1
2Nauanova ZhaniyaWFMKAZ
+104.9
6.5 pts · #2
3Baarspul, BramNED
+86.0
6.5 pts · #5

Top rating losers

1Balde, EskoNED
-92.0
2.0 pts · #51
2Van Dam, JoostNED
-56.6
2.5 pts · #45
3Almefalani, AbdulhayNED
-50.0
3.5 pts · #39

Biggest upsets

R8+251 Elo gap
Elangkumaran, Anumitra1688 beat Ritter, Uwe1939
R5+187 Elo gap
Groeneveld, Henry1783 beat Etienne, Ghilon1970
R4+185 Elo gap
Groeneveld, Henry1783 beat Van Dam, Joost1968