UniClass Amsterdam Science Park Chess Tournament 2025 - A

SwissStandard

102 players participated in this 9-round tournament, held from 05 Jul 2025 to 13 Jul 2025 in Amsterdam, Netherlands. 31 titled players from 8 federations. Top 10 Elo average was 2367, and top seed was Nico Zwirs (🇳🇱 NED, IM, 2456).

Oleksandr Dovgaliuk (🇺🇦 UKR, FM, 2174) won with 7.0/9, ahead of Etienne Goudriaan (7.0) and Leandro Slagboom (7.0). Dovgaliuk shared the lead from round 5, winning on tie-break.

The biggest upset came in round 8: Olaf Vlieger (1914) beat Lode De Jong (CM, 2241), a +327-point gap.

Location

🇳🇱Amsterdam, Netherlands

Dates

05 Jul 2025 → 13 Jul 2025

Time control

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

System

Swiss · 9 rounds

Top seed

🇳🇱IMNico Zwirs2456

Avg top 10

2,367

Participants

102

Titled players · 31

IM×5

FM×17

CM×8

WCM×1

Federations · 8 represented

🇳🇱Netherlands×87

🇬🇧England×3

🇺🇦Ukraine×2

🇩🇪Germany×2

🇪🇸Spain×1

🇸🇪Sweden×1

🇵🇹Portugal×1

🇩🇰Denmark×1

Top 3

🥇
FMOleksandr Dovgaliuk
🇺🇦UKR·2174
7.0pts·2483perf+141.6
🥈
IMEtienne Goudriaan
🇳🇱NED·2322
7.0pts·2407perf+9.5
🥉
FMLeandro Slagboom
🇳🇱NED·2364
7.0pts·2367perf+1.8

How it unfolded

Top 6 · 9 rounds

Tight race until R6; 3 players tied at 7.0/9, decided on Buchholz.

Co-leaders

Dovgaliuk7Slagboom7Goudriaan7Koster6.5Ritzerveld6.5Duijker6— ex-leaders:Riemersmaled R4, #7

R6 · LEADER CHANGE10 Jul

FM Oleksandr Dovgaliuk takes the sole lead (5.5/6).

R9 · TIEBREAK CLUSTER

3 players finish on 7.0/9. Dovgaliuk takes the title on Buchholz Cut1 (48.0).

R9 · HEAD-TO-HEAD · WINNER VS 2ND

FM Oleksandr Dovgaliuk drew with FM Leandro Slagboom (Black).

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1FMOleksandr Dovgaliuk	*	½	½	½
2FMLeandro Slagboom	½	*	—	—
3IMEtienne Goudriaan	½	—	*	—
4FMRamon Koster	½	—	—	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Dovgaliuk, OleksandrFM	2174	UKR	+47B	+75N	+5N	=4B	+12N	+24B	=2B	=7N	=3N	7.0	48.0	51.0	37.75	2483	+141.6
2	Goudriaan, EtienneIM	2322	NED	+99N	+33B	=10N	=30B	+17N	+9B	=1N	+24B	=12B	7.0	44.5	45.5	33.75	2407	+9.5
3	Slagboom, LeandroFM	2364	NED	+45B	=56N	=35B	=16N	+49B	+18N	+8B	+28N	=1B	7.0	42.0	46.0	35.50	2367	+1.8
4	Koster, RamonFM	2311	NED	+52B	+55N	+15B	=1N	+8B	=6N	=21B	=12N	=7B	6.5	45.5	49.5	34.50	2405	+23.6
5	Ritzerveld, NoahFM	2327	NED	+23B	+16N	−1B	−26N	+86B	=19N	+35B	+15N	+20B	6.5	44.0	46.5	31.75	2270	-9.6
6	Riemersma, LiIM	2431	NED	+40N	+17B	+18N	+20B	−24N	=4B	−7N	=9B	+14N	6.0	45.5	50.0	32.75	2324	-9.8
7	Albers, SasaFM	2252	NED	=14N	F	+45B	+19N	+32B	=42N	+6B	=1B	=4N	6.0	44.5	44.5	32.75	2374	+24.8
8	Kazarjan, GachaturFM	2202	NED	+88B	+82N	=31B	+13N	−4N	+37B	−3N	=10B	+30N	6.0	42.5	45.0	26.00	2312	+52.0
9	Van der Poel, HenkFM	2194	NED	=84B	+60N	=37B	+67N	+26B	−2N	=48B	=6N	+27B	6.0	39.5	42.5	26.50	2237	+10.6
10	Duijker, RickFM	2158	NED	+69B	+54N	=2B	−25N	−42B	+81N	+49B	=8N	+28B	6.0	39.0	42.0	26.00	2259	+24.8
11	Goudriaan, Rafael	2145	NED	−68N	+100B	+51N	+74B	F	+25N	=28B	=21N	+13B	6.0	32.0	32.0	23.25	2365	+44.2
12	Pham, KhoiIM	2358	NED	+92N	F	=34B	+31N	−1B	+15N	+42B	=4B	=2N	5.5	42.5	42.5	26.50	2333	-3.8
13	Elgersma, OnnoFM	2388	NED	+62N	=29B	+56N	−8B	=30N	+16B	+26N	=14B	−11N	5.5	42.0	46.0	26.25	2194	-19.5
14	Aravindhan, AchyuthCM	2031	NED	=7B	+28N	=61B	=15N	=34B	+78N	+32B	=13N	−6B	5.5	41.5	44.5	25.75	2323	+132.4
15	Doggers, Peter	2154	NED	+44N	+80B	−4N	=14B	+53N	−12B	+38N	−5B	+55N	5.5	41.0	44.0	22.75	2174	+6.6
16	De Saegher, Chris	2108	NED	+77N	−5B	+79N	=3B	=25B	−13N	+64B	=37N	+39B	5.5	40.0	43.0	22.75	2208	+23.4
17	Croese, Cor	2112	NED	+85B	−6N	+54B	+36N	−2B	−27N	=43B	+50N	+47B	5.5	39.5	42.5	22.25	2167	+12.8
18	Reimer, Philip	2197	GER	+97B	+19N	−6B	+48N	F	−3B	=33N	+29B	+26N	5.5	39.0	39.0	23.75	2293	+19.6
19	Edwardss, Dylan	2074	NED	+76N	−18B	+58N	−7B	+79N	=5B	−22N	+81B	+73N	5.5	37.0	40.0	19.75	2154	+19.6
20	Madularea, DavidFM	2218	NED	+96N	+51B	+91N	−6N	+78B	=21B	−24N	+34B	−5N	5.5	37.0	38.5	18.25	2315	+47.6
21	Zwirs, NicoIM	2456	NED	F	F	+27B	+35N	+61B	=20N	=4N	=11B	+22N	5.5	37.0	37.0	28.00	2403	-3.1
22	Snijders, Take	2196	NED	−51N	+66B	=49B	+68N	+75B	−34N	+19B	+72N	−21B	5.5	34.0	37.0	21.00	2160	-14.4
23	Titus, Branco	2045	NED	−5N	+94B	−36B	+54N	+56B	−61N	+78B	=71N	+35B	5.5	34.0	36.0	19.25	2202	+38.0
24	Grutter, TimIM	2405	NED	+67B	F	F	+34N	+6B	−1N	+20B	−2N	+42B	5.0	41.5	41.5	24.00	2386	-0.3
25	Van Baar, EsperFM	2232	NED	=43N	+65B	=29N	+10B	=16N	−11B	=55N	−26B	+52N	5.0	40.0	43.5	23.00	2130	-24.4
26	Boeren, Jurriaan	2096	NED	−38N	+81B	+76N	+5B	−9N	+59B	−13B	+25N	−18B	5.0	40.0	43.0	21.50	2196	+22.6
27	Vlieger, Olaf	1914	NED	=57N	+46B	−21N	=33B	+40N	+17B	−36N	+41B	−9N	5.0	39.5	43.5	23.25	2200	+62.8
28	Van Hesselingen, GuidoFM	2303	NED	=65N	−14B	+97N	+93B	+71N	+30B	=11N	−3B	−10N	5.0	38.5	40.0	16.75	2157	-32.0
29	Zhou, Zhengke	2092	NED	+64B	=13N	=25B	−61N	+39B	−32N	+87B	−18N	+60B	5.0	37.5	40.0	20.25	2153	+13.8
30	Wunnink, MichaelFM	2166	NED	+102B	=74N	+68B	=2N	=13B	−28N	=37B	+80N	−8B	5.0	37.5	37.5	16.50	2169	+1.2
31	Ten Dam, BramFM	2139	NED	+50B	+86N	=8N	−12B	F	−48N	+75B	+33B	=36N	5.0	34.5	34.5	19.25	2206	+28.4
32	Zecha, Oscar	2166	NED	=83N	+93B	=74N	+40B	−7N	+29B	−14N	−55B	+75N	5.0	34.0	36.0	17.50	2105	-30.0
33	Finkenflugel, Renzo	2079	NED	+39B	−2N	=53B	=27N	=50B	+86N	=18B	−31N	=43B	4.5	39.5	42.0	18.50	2045	-8.6
34	Persson, AndreasCM	2188	SWE	+100N	+38B	=12N	−24B	=14N	+22B	=73B	−20N	−37B	4.5	39.5	40.0	17.75	2132	-12.8
35	Maes, Djad	2117	NED	=87N	+89B	=3N	−21B	+74N	=38B	−5N	+68B	−23N	4.5	38.0	40.5	16.00	2114	-2.8
36	Weigand, AntonCM	2223	GER	−74B	F	+23N	−17B	=65N	+50N	+27B	=48N	=31B	4.5	36.0	36.0	21.00	2082	-27.4
37	Pathak, Raghav	2070	NED	+58B	F	=9N	+41B	F	−8N	=30N	=16B	+34N	4.5	35.5	35.5	21.25	2243	+67.6
38	Kleibeuker, Mika	1933	NED	+26B	−34N	+82B	−78N	+67B	=35N	−15B	−45N	+84B	4.5	33.5	36.5	16.75	2100	+78.0
39	Veldhorst, Berend	1926	NED	−33N	+96B	−46N	+66B	−29N	+74B	=57N	+65B	−16N	4.5	33.5	35.0	13.50	2060	+32.2
40	Majeed, Haroon	2068	ENG	−6B	+98N	+64B	−32N	−27B	=44N	−50B	+97N	+69B	4.5	33.5	34.5	12.25	2039	-9.2
41	De Jong, LodeCM	2241	NED	=60B	+84N	=48B	−37N	+83B	−73N	+52B	−27N	=49B	4.5	32.5	35.5	16.25	2017	-101.2
42	Van Batenburg, Mees	2198	NED	+66N	+79B	F	F	+10N	=7B	−12N	+73B	−24N	4.5	32.5	32.5	19.00	2263	+27.2
43	Hoetink, Simeon	2026	NED	=25B	−61N	=89N	=87B	=77N	+76B	=17N	=59B	=33N	4.5	31.5	34.0	16.50	2067	+18.0
44	Khatniuk, Anastasiia	1980	UKR	−15B	−78N	+99N	=57B	=70N	=40B	=67N	=63B	+65N	4.5	31.5	32.5	14.25	2093	+27.4
45	Bryant, HarryCM	2058	ENG	−3N	+90B	−7N	−89B	+94N	+79B	=59N	+38B	F	4.5	31.5	31.5	14.00	2116	+23.2
46	Vistisen, LarsCM	2103	DEN	=72B	−27N	+39B	=50N	−73B	=47N	F	+77B	+81N	4.5	31.0	31.0	16.50	1996	-22.2
47	Roebers, Bregje	1994	NED	−1N	−95B	=90N	=96B	+99N	=46B	+77N	+91B	−17N	4.5	28.5	29.5	10.75	2067	+35.6
48	Leenen, BoydCM	2074	NED	F	+101B	=41N	−18B	+89N	+31B	=9N	=36B	F	4.5	28.5	28.5	15.50	2233	+61.6
49	Thijssen, Freek	2045	NED	F	=87B	=22N	+70B	−3N	+53B	−10N	=58B	=41N	4.0	37.0	37.0	15.75	2112	+25.2
50	Gergin, Isafara	1968	NED	−31N	+62B	=63N	=46B	=33N	−36B	+40N	−17B	=57N	4.0	36.5	40.5	17.00	2066	+47.2
51	Agarwal, AmayaWCM	2004	ENG	+22B	−20N	−11B	+58N	−55B	−56N	+94B	−64N	+76B	4.0	36.0	38.0	14.50	2001	-2.4
52	Winter, Sven	2041	NED	−4N	−76B	−77N	+62B	+90N	+89B	−41N	+53B	−25B	4.0	32.5	35.0	13.00	2017	-12.8
53	Jelic, Bruno	1960	NED	+71N	−91B	=33N	+63B	−15B	−49N	=70B	−52N	+82B	4.0	32.0	34.5	14.50	2060	+24.2
54	Kroon, Ivo	1965	NED	+95N	−10B	−17N	−23B	−66N	=62B	=82B	+93N	+88N	4.0	32.0	34.0	10.00	2024	+14.6
55	Rosegg, Dennis	2080	NED	+90N	−4B	F	=65B	+51N	F	=25B	+32N	−15B	4.0	32.0	32.0	15.75	2169	+17.0
56	Padeiro, JoseFM	2119	POR	+81N	=3B	−13B	F	−23N	+51B	=68N	+66B	F	4.0	32.0	32.0	15.75	2155	+6.0
57	Theulings, Paul-PeterCM	2075	NED	=27B	=72N	−86B	=44N	−68B	+101N	=39B	=69N	=50B	4.0	31.0	31.5	13.00	1912	-39.2
58	Leentjens, Gilbert	1891	NED	−37N	F	−19B	−51B	=85N	+88N	+83B	=49N	+71B	4.0	30.0	30.0	12.50	2033	+30.0
59	Groenewoud, Joel	2257	NED	−75B	−88N	+102B	+69N	+92B	−26N	=45B	=43N	F	4.0	29.0	29.0	10.50	2031	-90.4
60	Habig, Bryan	2031	NED	=41N	−9B	−93N	=80B	−76N	+90B	+98N	+87B	−29N	4.0	28.5	29.5	9.75	1972	-14.2
61	Krylov, Philippe	2171	NED	=93N	+43B	=14N	+29B	−21N	+23B	F	F	F	4.0	28.0	28.0	18.75	2232	+18.0
62	Pascual, Diego	2066	ARG	−13B	−50N	−69B	−52N	+102B	=54N	+101B	=83N	+89B	4.0	27.0	27.0	6.50	1985	-20.6
63	Smid, Jelle	2119	NED	−86B	+69N	=50B	−53N	F	+98B	−80N	=44N	+66B	4.0	26.0	26.0	12.25	1962	-33.0
64	Gassner, Yuri	1931	NED	−29N	+99B	−40N	F	F	+96B	−16N	+51B	+67N	4.0	25.0	25.0	10.00	2107	+33.4
65	Garay, Enzo	2037	NED	=28B	−25N	+84B	=55N	=36B	−72N	+86B	−39N	−44B	3.5	34.0	36.5	12.25	1991	-26.4
66	Mienis, Dennis	2007	NED	−42B	−22N	+98B	−39N	+54B	+70N	=71B	−56N	−63N	3.5	33.5	34.5	10.25	2004	-1.6
67	Kohler, AranFM	2067	NED	−24N	+77B	+80N	−9B	−38N	F	=44B	+79N	−64B	3.5	33.0	33.0	11.25	1985	-20.0
68	Alvares, Thomas	1971	NED	+11B	F	−30N	−22B	+57N	F	=56B	−35N	+70B	3.5	32.5	32.5	15.50	2136	+30.4
69	Hacquebord, Tjerk	1982	NED	−10N	−63B	+62N	−59B	−96N	+100B	+74N	=57B	−40N	3.5	31.0	31.5	9.50	2007	+4.8
70	Vroombout, Enrico	2135	NED	=101N	+83B	F	−49N	=44B	−66B	=53N	+85B	−68N	3.5	30.5	31.0	10.50	1940	-42.4
71	Kanis, Sierk	2123	NED	−53B	+102N	+88B	=86N	−28B	F	=66N	=23B	−58N	3.5	27.0	27.0	8.25	1977	-32.0
72	Heus, Daan	1939	NED	=46N	=57B	F	=92N	F	+65B	+91N	−22B	F	3.5	26.5	26.5	11.50	2159	+70.4
73	Smeets, Christiaan	1981	NED	F	F	F	+95B	+46N	+41B	=34N	−42N	−19B	3.5	25.5	25.5	13.25	2214	+75.2
74	Harmsen, Michiel	2020	NED	+36N	=30B	=32B	−11N	−35B	−39N	−69B	−90N	+98N	3.0	35.5	36.5	10.50	1945	-18.0
75	Darie, Aden	2035	NED	+59N	−1B	+95N	=91B	−22N	=80B	−31N	F	−32B	3.0	35.0	37.0	8.75	2049	+3.2
76	Bloem, Mark	1896	NED	−19B	+52N	−26B	−83N	+60B	−43N	+93B	F	−51N	3.0	33.0	35.0	10.00	1945	+9.0
77	Hallibert, Emilien	1944	NED	−16B	−67N	+52B	=88N	=43B	=93N	−47B	−46N	=85B	3.0	32.0	34.0	10.00	1907	-17.2
78	Olariu, Luca-Stefan	2137	ROU	−79N	+44B	+87N	+38B	−20N	−14B	−23N	F	F	3.0	31.0	31.0	11.50	1968	-31.8
79	Verschoor, Scott	1968	NED	+78B	−42N	−16B	+82N	−19B	−45N	+96N	−67B	F	3.0	31.0	31.0	7.50	2005	+6.4
80	Van Engelen, Stijn	1868	NED	F	−15N	−67B	=60N	+93B	=75N	+63B	−30B	F	3.0	29.5	29.5	9.50	2031	+54.8
81	Asefi, ZaheeruddeenFM	1956	AFG	−56B	−26N	F	+100B	+97N	−10B	+92N	−19N	−46B	3.0	29.5	29.5	4.50	1989	+5.8
82	Perez Garcia, Hebert	2078	NED	+94N	−8B	−38N	−79B	−98N	=85B	=54N	+96B	−53N	3.0	28.0	29.0	7.00	1862	-51.8
83	Ten Hacken, Jos	1991	NED	=32B	−70N	F	+76B	−41N	F	−58N	=62B	+87N	3.0	26.5	26.5	10.00	1999	0.0
84	Shklovskiy, Evgeny	2004	FID	=9N	−41B	−65N	=90B	−95N	−94B	+100N	+98B	−38N	3.0	26.0	26.5	5.75	1915	-21.8
85	Galje, Hans	1944	NED	−17N	−92B	=100N	−97B	=58B	=82N	+88B	−70N	=77N	3.0	25.5	26.0	7.75	1900	-10.2
86	Markus, John Raymond	1952	NED	+63N	−31B	+57N	=71B	−5N	−33B	−65N	F	F	2.5	31.0	31.0	9.75	2026	+11.2
87	Seth, Aakrit	1951	NED	=35B	=49N	−78B	=43N	+88B	F	−29N	−60N	−83B	2.5	30.5	30.5	9.00	1915	-14.8
88	Zhang, Xiheng	2010	NED	−8N	+59B	−71N	=77B	−87N	−58B	−85N	+94N	−54B	2.5	30.0	32.0	7.50	1856	-76.0
89	Schiebroek, Luc	1963	NED	F	−35N	=43B	+45N	−48B	−52N	=97B	=92B	−62N	2.5	30.0	30.0	8.75	1914	-9.8
90	Veenendaal, Loek	1929	NED	−55B	−45N	=47B	=84N	−52B	−60N	F	+74B	=92N	2.5	29.5	29.5	8.00	1894	-7.0
91	Van Zutphen, Jimmy	2150	NED	+98B	+53N	−20B	=75N	F	F	−72B	−47N	F	2.5	24.5	24.5	6.50	1964	-30.6
92	Hoffman, Ron	2051	NED	−12B	+85N	F	=72B	−59N	F	−81B	=89N	=90B	2.5	24.0	24.0	7.25	1948	-22.0
93	Guillaumond, Matthieu	1992	NED	=61B	−32N	+60B	−28N	−80N	=77B	−76N	−54B	F	2.0	31.0	31.0	7.50	1850	-61.6
94	Ten Kate, Gustav	1918	NED	−82B	−23N	F	F	−45B	+84N	−51N	−88B	+96N	2.0	24.0	24.0	4.50	1873	-16.8
95	Schilstra, Laurens	2135	NED	−54B	+47N	−75B	−73N	+84B	F	F	F	F	2.0	18.0	18.0	7.50	1924	-28.8
96	Dekker, Constantijn	2018	NED	−20B	−39N	F	=47N	+69B	−64N	−79B	−82N	−94B	1.5	30.0	30.0	5.75	1751	-54.0
97	Knol, Daniel	2006	NED	−18N	F	−28B	+85N	−81B	F	=89N	−40B	F	1.5	23.5	23.5	4.25	1879	-20.6
98	Smit, Manuel	1976	NED	−91N	−40B	−66N	F	+82B	−63N	−60B	−84N	−74B	1.0	27.5	27.5	3.00	1738	-41.8
99	Ambrona Navarro, Himar	2041	ESP	−2B	−64N	−44B	+102N	−47B	F	F	F	F	1.0	20.0	20.0	0.00	1804	-61.2
100	Koppenens, Oscar	2000	NED	−34B	−11N	=85B	−81N	F	−69N	−84B	F	F	0.5	23.0	23.0	1.50	1636	-89.2
101	Mohamedjoesoef, Rafiek	1962	NED	=70B	−48N	F	F	F	−57B	−62N	F	F	0.5	16.0	16.0	1.75	1766	-16.6
102	Winnubst, Paul	1992	NED	−30N	−71B	−59N	−99B	−62N	F	F	F	F	0.0	17.5	17.5	0.00	1331	-64.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Dovgaliuk, OleksandrFMUKR
+141.6
7.0 pts · #1
2Aravindhan, AchyuthCMNED
+132.4
5.5 pts · #15
3Kleibeuker, MikaNED
+78.0
4.5 pts · #35

Top rating losers

1De Jong, LodeCMNED
-101.2
4.5 pts · #47
2Groenewoud, JoelNED
-90.4
4.0 pts · #57
3Koppenens, OscarNED
-89.2
0.5 pts · #100

Biggest upsets

R8+327 Elo gap
Vlieger, Olaf1914 beat CMDe Jong, Lode2241
R2+272 Elo gap
CMAravindhan, Achyuth2031 beat FMVan Hesselingen, Guido2303
R6+260 Elo gap
Smeets, Christiaan1981 beat CMDe Jong, Lode2241