CChessStats

Dutch Open Youth Championship 2025 (U18)

Open SwissStandard

28 players participated in this 9-round tournament, held from 31 Jul 2025 to 06 Aug 2025 in Dieren, Netherlands. 1 titled players from 2 federations. Top 10 Elo average was 1891, and top seed was Boyd Leenen (🇳🇱 NED, CM, 2074).

Jesse Frederiks (🇳🇱 NED, 1763) won with 7.5/9, ahead of Wout Van Harten (7.0) and Leon Elferink (6.5). Frederiks took the lead from round 8.

The biggest upset came in round 6: Mathijs Vogels (1711) beat Boyd Leenen (CM, 2074), a +363-point gap.

Location
🇳🇱Dieren, Netherlands
Dates
31 Jul 2025 → 06 Aug 2025
Time control
Standard: 90 minutes with 30 second increment from move 1
System
Swiss · 9 rounds
Top seed
🇳🇱CMBoyd Leenen2074
Avg top 10
1,891
Participants
28
Titled players · 1
CM×1
Federations · 2 represented
🇳🇱Netherlands×22
🇩🇪Germany×4
Top 3

How it unfolded

Top 6 · 9 rounds

Jesse Frederiks led from R8; +0.5-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R8.

Co-leaders
12
5
2
2
3
1
1
1
1
2.54.579R1R2R3R4R5R6R7R8R9Frederiks takes lead
Frederiks7.5Van Harten7Elferink6.5Koppenens6Vogels5.5Thijssen5.5
R8 · LEADER CHANGE05 Aug

Jesse Frederiks takes the sole lead (6.5/8).

R5 · HEAD-TO-HEAD · WINNER VS 2ND

Jesse Frederiks drew with Wout Van Harten (Black).

WIN STREAKS · 3 top finishers

Jesse Frederiks 4 wins (R6–R9)Wout Van Harten 3 wins (R1–R3)Leon Elferink 3 wins (R1–R3)

Key matchups · top 4

Head-to-head between the four finishers
Player1234
1Jesse Frederiks*
½
1
0
2Wout Van Harten
½
*
½
1
3Leon Elferink
0
½
*
½
4Oscar Koppenens
1
0
½
*

Grille américaine

#PlayerEloFedR1R2R3R4R5R6R7R8R9PtsBu C1BuSBPerfΔ
1Frederiks, Jesse1763NED+20B+8N−4B+6B=2N+9N+15B+3N+5B7.545.049.039.502097+80.5
2Van Harten, Wout1780NED+17N+16B+6N=3N=1B+7B+4N−5N+8B7.046.050.538.002077+134.0
3Elferink, Leon1923NED+27N+15B+10N=2B=7N=4N+5B−1B+11N6.546.046.529.751966+20.0
4Koppenens, Oscar2000NED=13N+11B+1N=7B+8N=3B−2B+6N=12B6.047.052.034.001979-2.0
5Vogels, Mathijs1711NED+23N−6B=19N+17B+14N+8B−3N+2B−1N5.545.048.527.001830+53.6
6Seth, Aakrit1951NED+24B+5N−2B−1N+21B+18N+9B−4B=7N5.544.548.024.751826-43.6
7Thijssen, Freek2045NED+22B=9N+18B=4N=3B−2N=14B+10N=6B5.544.047.526.501872-64.0
8Leenen, BoydCM2074NED+19N−1B+9B+10N−4B−5N+16B+15N−2N5.045.049.023.001803-107.2
9Van den Berg, Leon1768NED+25N=7B−8N+15B+12N−1B−6N+17B=13B5.042.546.022.751799+9.6
10Van Haaften, Jelle1770NED+14B+12N−3B−8B=16N=19N+18B−7B+20N5.039.543.522.251788+6.4
11Hagen, Carlijn1839NED=18B−4N+21B=13N+22B−15N+19B+14N−3B5.039.042.521.001706-52.4
12Dijkhuijsen, Thomas1688NED+28N−10B=17N+23B−9B=16N=13N+19B=4N5.037.538.018.001696+1.2
13Van Deelen, Luca1624NED=4B−18N+24B=11B−15N+20N=12B+23B=9N5.037.040.521.501733+47.2
14Elferink, Duncan1537NED−10N+28B=16N+19B−5B+24N=7N−11B+22N5.036.537.016.501729+74.8
15Breider, Jayden1688NED+21B−3N+22B−9N+13B+11B−1N−8B=16N4.542.546.019.751746+17.6
16Deij, Casper1682NED+26B−2N=14B=18N=10B=12B−8N+21N=15B4.539.542.518.751630-25.2
17Van Duuren, Gilead1559NED−2B+26N=12B−5N=24B=22N+25B−9N+23B4.536.539.516.001570+1.6
18Hesse, Lucas1589GER=11N+13B−7N=16B+23N−6B−10N−22B+28N4.037.538.013.751663+20.4
19Hesse, Frederik1648GER−8B+20N=5B−14N+26N=10B−11N−12N+27B4.037.538.012.751572-34.4
20Kempkens, Mathilda1517GER−1N−19B+28N−22N+25B−13B+27N+26B−10B4.032.032.57.50888-55.6
21van der Sterren, Joris0NED−15N+27B−11N+25B−6N−23B+28N−16B+26N4.030.030.57.509340.0
22Janssen, Thijn1636NED−7N+25B−15N+20B−11N=17B−23N+18N−14B3.536.039.513.751519-56.0
23Bos, Yaro1511NED−5B=24N+27B−12N−18B+21N+22B−13N−17N3.535.035.59.751401-35.2
24Verhoog, Willem1608NED−6N=23B−13N+28B=17N−14B−26B+27N=25B3.530.531.06.751396-56.0
25Bollow, Niels Fredrik0GER−9B−22N+26B−21N−20N+27B−17N+28B=24N3.528.028.55.7512520.0
26Meijer, Ivar0NED−16N−17B−25N+27N−19B+28B+24N−20N−21B3.028.529.04.5013630.0
27FIDE 401018430—−3B−21N−23N−26B=28N−25N−20B−24B−19N0.532.032.50.258420.0
28FIDE 401221740—−12B−14N−20B−24N=27B−26N−21B−25N−18B0.532.032.50.257880.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers
Top rating losers
Biggest upsets