UniClass Amsterdam Science Park Chess Tournament 2025 - C

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51 players participated in this 9-round tournament, held from 05 Jul 2025 to 13 Jul 2025 in Amsterdam, Netherlands. 5 federations represented. Top 10 Elo average was 1731, and top seed was Frederieke Regterschot (🇳🇱 NED, 1778).

Joop Gijsbers (🇳🇱 NED, 1677) won with 7.5/9, ahead of Krijn Ter Braake (7.0) and Jan Veraart (7.0). Gijsbers shared the lead from round 8 and broke clear in the final round.

The biggest upset came in round 7: Archit Saigal (1494) beat Frank Sala (1669), a +175-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

🇳🇱Frederieke Regterschot1778

Avg top 10

1,731

Participants

Federations · 5 represented

🇳🇱Netherlands×45

🇮🇳India×2

🇹🇷Turkiye×1

FIDE (no federation)×1

🇬🇧England×1

Top 3

🥇
Joop Gijsbers
🇳🇱NED·1677
7.5pts·1909perf+33.4
🥈
Krijn Ter Braake
🇳🇱NED·1720
7.0pts·1856perf+27.2
🥉
Jan Veraart
🇳🇱NED·1717
7.0pts·1970perf+78.4

How it unfolded

Top 6 · 9 rounds

Joop Gijsbers led from R9; +0.5-point edge over the runner-up. Title race converged from 4 co-leaders at R4 to 1 by R9.

Co-leaders

Gijsbers7.5Veraart7Ter Braake7Duerckheim6De Groot6Saricicek6

R6 · LEADER CHANGE10 Jul

Krijn Ter Braake takes the sole lead (5.5/6).

R4 · HEAD-TO-HEAD · WINNER VS 2ND

Joop Gijsbers beat Jan Veraart (Black).

WIN STREAKS · 3 top finishers

Joop Gijsbers 3+4 wins (R2–R4, R6–R9)Jan Veraart 5 wins (R5–R9)Krijn Ter Braake 6 wins (R2–R7)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Joop Gijsbers	*	1	0	½
2Jan Veraart	0	*	1	—
3Krijn Ter Braake	1	0	*	—
4Jonathan Duerckheim	½	—	—	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	R8	R9	Pts	Bu C1	Bu	SB	Perf	Δ
1	Gijsbers, Joop	1677	NED	=5B	+38N	+10B	+3N	−2N	+4B	+18N	+31B	+11N	7.5	44.0	47.0	37.00	1909	+33.4
2	Ter Braake, Krijn	1720	NED	=37B	+7N	+19B	+18N	+1B	+9N	+16B	−3N	=4B	7.0	45.0	48.0	36.50	1856	+27.2
3	Veraart, Jan	1717	NED	+6N	F	+29B	−1B	+22N	+19N	+9B	+2B	+18N	7.0	43.0	43.0	35.50	1970	+78.4
4	De Groot, Joris	1707	NED	=7B	−5N	+36N	+17B	+15N	−1N	+20B	+14B	=2N	6.0	45.5	49.0	29.25	1824	+44.8
5	Duerckheim, Jonathan	0	NED	=1N	+4B	−34N	+33B	=12N	=13B	=21B	+19N	+9B	6.0	41.0	44.5	30.00	1745	0.0
6	Saricicek, Bilal Eren	1620	TUR	−3B	+30N	+40B	+28B	+31N	−16B	−13N	+12B	+10N	6.0	38.5	41.5	24.50	1752	+56.0
7	Pex, John	1619	NED	=4N	−2B	+50N	=27B	=41N	+22B	=12N	+40B	=14N	5.5	37.5	37.5	19.00	1747	+57.2
8	Bartman, Victor	1637	NED	=23B	=40N	=37B	−10N	+39B	=38N	=25B	+33B	+20N	5.5	31.0	34.0	20.00	1697	+15.4
9	Beusen, Frank	1677	NED	+46N	=15B	+17N	+24B	+34N	−2B	−3N	=13B	−5N	5.0	43.0	45.5	20.50	1759	+17.2
10	Archit Saigal	1494	IND	=27N	+33B	−1N	+8B	=24N	−31B	+41B	+21N	−6B	5.0	39.0	42.0	20.75	1702	+39.4
11	Au, Willy	1633	NED	−13N	+25B	+39N	=12B	−21B	=23N	+32B	+27N	−1B	5.0	38.5	41.5	19.75	1713	+31.2
12	Koopmans, Perry	1706	NED	+45B	=29N	=22B	=11N	=5B	=20N	=7B	−6N	+44B	5.0	38.5	41.0	20.25	1668	-7.8
13	Poldermans, Daan	1744	NED	+11B	=19N	=31B	−20N	+29B	=5N	+6B	=9N	F	5.0	38.5	38.5	24.50	1769	+3.6
14	Regterschot, Frederieke	1778	NED	=20B	=37N	+35B	=22N	−19B	+24B	+15N	−4N	=7B	5.0	38.0	41.0	21.75	1678	-48.0
15	Aravindhan, Aadvik	1602	NED	+32B	=9N	−21B	+49N	−4B	+41N	−14B	=23N	+38B	5.0	34.5	36.0	15.75	1747	+55.2
16	Aayiu Atindrya Shetty	1634	IND	F	F	+43B	+32N	+20B	+6N	−2N	−18B	+31N	5.0	32.0	32.0	20.50	1791	+24.9
17	Sommer, Hugo	1627	NED	=49B	+23N	−9B	−4N	+48B	=32N	F	+36B	+40N	5.0	29.0	29.0	15.50	1727	+13.8
18	Yang, Andy	0	ENG	F	=34B	+27N	−2B	+28N	+21N	−1B	+16N	−3B	4.5	42.5	42.5	19.25	1681	0.0
19	Kaptein, Peter	1648	NED	+48N	=13B	−2N	+44B	+14N	−3B	=40N	−5B	=24N	4.5	40.5	42.5	16.25	1708	+11.6
20	Naranjo Contrera, Nestor	1641	NED	=14N	+50B	=28N	+13B	−16N	=12B	−4N	+25B	−8B	4.5	40.0	40.0	16.50	1641	-1.6
21	Roels, Tobias	0	NED	=26N	+36B	+15N	−34B	+11N	−18B	=5N	−10B	=22N	4.5	38.0	41.5	21.00	1608	0.0
22	De Koning, Casper	1641	NED	+51N	=28B	=12N	=14B	−3B	−7N	=29B	+39N	=21B	4.5	38.0	38.0	14.25	1617	-10.4
23	Buschman, Rob	1762	NED	=8N	−17B	+26N	=37B	=27N	=11B	=24N	=15B	=29N	4.5	37.5	40.5	20.00	1591	-37.4
24	Veelenturf, Wim	1650	NED	=47N	+26B	+49B	−9N	=10B	−14N	=23B	=44N	=19B	4.5	34.0	35.5	15.75	1621	-6.0
25	Kaushik, Shashank	1575	NED	−31B	−11N	+51B	+35N	=32B	=27B	=8N	−20N	+39B	4.5	32.5	32.5	13.00	1614	+12.8
26	Verheijden, Chris	0	NED	=21B	−24N	−23B	+42N	+35B	F	+28N	F	+27B	4.5	28.0	28.0	16.75	1678	0.0
27	Koks, Paul	1662	NED	=10B	+42N	−18B	=7N	=23B	=25N	+38B	−11B	−26N	4.0	36.5	39.5	15.75	1636	-4.2
28	Pot, Hans	1688	NED	+35B	=22N	=20B	−6N	−18B	+37N	−26B	=38N	=30B	4.0	34.5	37.5	14.50	1648	-7.0
29	Zhang, Jinchen	1643	NED	+43B	=12B	−3N	F	−13N	=45B	=22N	+37N	=23B	4.0	34.5	34.5	14.25	1651	+4.4
30	Van Hattum, Karel	1527	NED	−34N	−6B	−46N	+50B	+51N	=42B	−33N	+45B	=28N	4.0	25.0	25.0	6.00	1454	-28.0
31	Zur, Eytan	0	NED	+25N	+39B	=13N	F	−6B	+10N	F	−1N	−16B	3.5	39.5	39.5	15.00	1609	0.0
32	Van Leeuwen, Dick	0	NED	−15N	+47B	+45N	−16B	=25N	=17B	−11N	=35B	F	3.5	34.0	36.5	11.50	1507	0.0
33	Keizers, Paul	1649	NED	=42B	−10N	+47B	−5N	=38B	=44N	+30B	−8N	F	3.5	33.0	35.5	11.00	1489	-26.8
34	Makkelie, Marcus	1671	NED	+30B	=18N	+5B	+21N	−9B	F	F	F	F	3.5	27.5	27.5	16.75	1602	-7.2
35	Van der Kraan, Lennart	1592	NED	−28N	+51B	−14N	−25B	−26N	F	+43B	=32N	+41B	3.5	27.5	27.5	7.75	1552	-11.2
36	Siewertsen, Klaas	0	NED	F	−21N	−4B	=39B	=46N	=48N	+50B	−17N	+43B	3.5	26.0	26.0	6.75	1497	0.0
37	Melchers, Bert-Jan	1620	NED	=2N	=14B	=8N	=23N	−40B	−28B	+47N	−29B	−42N	3.0	36.0	38.5	13.50	1488	-27.0
38	Gooijers, Richard	1545	NED	F	−1B	=41N	+45B	=33N	=8B	−27N	=28B	−15N	3.0	35.0	35.0	10.50	1561	+2.4
39	Poel, Jacob	1517	NED	+41B	−31N	−11B	=36N	−8N	=46B	+42N	−22B	−25N	3.0	32.5	35.0	9.00	1499	-4.0
40	Knoester, Klaas	1749	NED	F	=8B	−6N	+46B	+37N	F	=19B	−7N	−17B	3.0	32.0	32.0	10.50	1572	-68.0
41	Sala, Frank	1669	NED	−39N	F	=38B	+43N	=7B	−15B	−10N	+46B	−35N	3.0	30.5	30.5	9.75	1458	-46.2
42	Penthor, Stacey	1471	NED	=33N	−27B	−44N	−26B	F	=30N	−39B	+48N	+37B	3.0	27.0	27.0	8.75	1471	0.0
43	Bajnath, Amresh	1410	NED	−29N	+46B	−16N	−41B	−45N	+51B	−35N	+47B	−36N	3.0	26.5	26.5	5.00	1348	-16.0
44	Reitema, Frans	1601	NED	F	−49N	+42B	−19N	F	=33B	+45N	=24B	−12N	3.0	24.5	24.5	9.50	1588	-5.6
45	Shvets, Andrey	1602	FID	−12N	F	−32B	−38N	+43B	=29N	−44B	−30N	+48B	2.5	27.5	29.5	7.00	1380	-69.2
46	Van Haaften, Rob	1582	NED	−9B	−43N	+30B	−40N	=36B	=39N	=48B	−41N	−47N	2.5	27.0	29.0	8.25	1399	-28.4
47	Regterschot, Alexander	0	NED	=24B	−32N	−33N	−48B	+50N	F	−37B	−43N	+46B	2.5	22.0	22.0	4.75	1434	0.0
48	Leijdekkers, Tom	0	NED	−19B	F	F	+47N	−17N	=36B	=46N	−42B	−45N	2.0	26.0	26.0	5.50	1220	0.0
49	Van As, Cor	1741	NED	=17N	+44B	−24N	−15B	F	F	F	F	F	1.5	17.5	17.5	5.50	1533	-23.2
50	FIDE 1071300	0	—	F	−20N	−7B	−30N	−47B	F	−36N	F	F	0.0	20.0	20.0	0.00	796	0.0
51	Engel, Quirine	0	NED	−22B	−35N	−25N	F	−30B	−43N	F	F	F	0.0	19.5	19.5	0.00	749	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Veraart, JanNED
+78.4
7.0 pts · #1
2Pex, JohnNED
+57.2
5.5 pts · #11
3Saricicek, Bilal ErenTUR
+56.0
6.0 pts · #9

Top rating losers

1Shvets, AndreyFID
-69.2
2.5 pts · #43
2Knoester, KlaasNED
-68.0
3.0 pts · #29
3Regterschot, FrederiekeNED
-48.0
5.0 pts · #6

Biggest upsets

R7+175 Elo gap
Archit Saigal1494 beat Sala, Frank1669
R2+172 Elo gap
Bajnath, Amresh1410 beat Van Haaften, Rob1582
R2+155 Elo gap
Archit Saigal1494 beat Keizers, Paul1649