Player profile
Ondersteijn, Niels
Dossier
73 of 80 games analyzed.
Accuracy: 89.3%
Opened c4: 31/38Opened Nf3: 3/38Opened g3: 2/38Opened d4: 1/38Opened b3: 1/38
Castled kingside: 63Same-side castling: 55Did not castle: 6Opposite-side castling: 5Castled queenside: 1
Fianchettoed kingside: 51Fianchettoed queenside: 22Played on the queenside: 19Played in the center: 15Played on the kingside: 15
Initiated exchanges: 52Active pieces: 52Backward pawn: 51Sacrificed material: 47Space advantage: 41Kept the bishop pair: 37Isolated pawn: 29Missed tactics: 19Played gambits: 9Avoided exchanges: 7
Openings
Click "+" to add that group to the games list below. Multiple groups can be added at once.
As White 41 games 25W 6D 10L
English Opening 33 games 20W 5D 8L
Agincourt Defense 13 games 5W 3D 5L
(unspecified)
7 games
2W
1D
4L
Neo-Catalan Declined
4 games
1W
2D
1L
Catalan Defense Accepted
2 games
2W
0D
0L
King's English Variation 7 games 4W 2D 1L
(unspecified)
5 games
4W
0D
1L
Two Knights Variation, Keres Variation
1 game
0W
1D
0L
Botvinnik System
1 game
0W
1D
0L
Anglo-Indian Defense 6 games 6W 0D 0L
(unspecified)
6 games
6W
0D
0L
Symmetrical Variation 4 games 4W 0D 0L
Rubinstein Variation
2 games
2W
0D
0L
Botvinnik System Reversed, with Nf3
1 game
1W
0D
0L
Three Knights, Fianchetto Variation
1 game
1W
0D
0L
(unspecified) 2 games 1W 0D 1L
(unspecified)
2 games
1W
0D
1L
Neo-Catalan 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
King's Indian Defense 2 games 0W 1D 1L
Fianchetto Variation 2 games 0W 1D 1L
Classical Variation
2 games
0W
1D
1L
King's Indian Attack 2 games 1W 0D 1L
(unspecified) 2 games 1W 0D 1L
(unspecified)
2 games
1W
0D
1L
Hungarian Opening 1 game 1W 0D 0L
(unspecified) 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Réti Opening 1 game 1W 0D 0L
Anglo-Slav Variation 1 game 1W 0D 0L
with g3
1 game
1W
0D
0L
Benko Gambit Accepted 1 game 1W 0D 0L
Modern Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Nimzo-Larsen Attack 1 game 1W 0D 0L
Indian Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
As Black 36 games 13W 8D 15L
Pirc Defense 15 games 4W 5D 6L
(unspecified) 8 games 2W 3D 3L
(unspecified)
8 games
2W
3D
3L
Classical Variation 3 games 0W 1D 2L
(unspecified)
1 game
0W
0D
1L
Quiet System
1 game
0W
1D
0L
Schlechter Variation
1 game
0W
0D
1L
Austrian Attack 2 games 1W 1D 0L
(unspecified)
1 game
0W
1D
0L
Weiss Variation
1 game
1W
0D
0L
Byrne Variation 2 games 1W 0D 1L
(unspecified)
2 games
1W
0D
1L
Bogo-Indian Defense 4 games 3W 0D 1L
Nimzowitsch Variation 2 games 1W 0D 1L
(unspecified)
2 games
1W
0D
1L
Grünfeld Variation 2 games 2W 0D 0L
(unspecified)
2 games
2W
0D
0L
English Opening 4 games 2W 0D 2L
Agincourt Defense 2 games 1W 0D 1L
(unspecified)
1 game
1W
0D
0L
Catalan Defense Accepted
1 game
0W
0D
1L
Great Snake Variation 2 games 1W 0D 1L
(unspecified)
2 games
1W
0D
1L
Indian Defense 3 games 2W 1D 0L
Tartakower Attack 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Knights Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Wade-Tartakower Defense 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Nimzo-Indian Defense 3 games 1W 1D 1L
Sämisch Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
(unspecified) 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Normal Variation 1 game 0W 1D 0L
Ragozin Variation
1 game
0W
1D
0L
Sicilian Defense 1 game 0W 0D 1L
Taimanov Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Philidor Defense 1 game 0W 0D 1L
Exchange Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Trompowsky Attack 1 game 1W 0D 0L
(unspecified) 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Catalan Opening 1 game 0W 1D 0L
Open Defense 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Queen's Pawn Game 1 game 0W 0D 1L
Symmetrical Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
King's Indian Defense 1 game 0W 0D 1L
Fianchetto Variation 1 game 0W 0D 1L
Uhlmann-Szabo System
1 game
0W
0D
1L
Zukertort Opening 1 game 0W 0D 1L
Pirc Invitation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Blunders Top 4 of 322
This player's costliest moves in analyzed games. Can you find the winning move?
Games Showing all 80 games
| Date | Event | Round | Color | Opponent | Result | Accuracy % | First moves |
|---|---|---|---|---|---|---|---|
| 2026.10.21 | Round 5: Laurent-Paoli, Pierre - Ondersteijn, Niels | 5.19 | 2026.10.21 Laurent-Paoli, Pierre (26017962) (2550) | 0 | 79.50% | 1. e4 c5 2. Nf3 e6 3. d4 cxd4 | |
| 2026.10.03 | Meesterklasse 202627 | 2.2 | 2026.10.03 Ernst, Sipke (1004689) (2547) | 0 | 90.80% | 1. c4 e6 2. Nf3 d5 3. g3 Nf6 | |
| 2026.09.19 | Round 1: Ondersteijn, Niels - Klaska, Philipp Leon | 1.5 | 2026.09.19 Klaska, Philipp Leon (16238044) (2364) | ½ | - | 1. c4 Nf6 2. g3 e5 3. Bg2 Bc5 | |
| 2026.05.17 | Round 5: Thijssen, Freek - Ondersteijn, Niels | 5.9 | 2026.05.17 Thijssen, Freek (1091840) (2133) | 0 | 88.00% | 1. e4 e5 2. Nf3 d6 3. d4 exd4 | |
| 2026.05.16 | Round 4: Ondersteijn, Niels - Grooten, Herman | 4.10 | 2026.05.16 Grooten, Herman (1000330) (2175) | ½ | 93.10% | 1. g3 e5 2. c4 Nc6 3. Bg2 g6 | |
| 2026.05.15 | Round 1: Guillaumond, Matthieu - Ondersteijn, Niels | 1.6 | 2026.05.15 Guillaumond, Matthieu (1097091) (2094) | 0 | 83.10% | 1. e4 d6 2. d4 g6 3. Nf3 Nf6 | |
| 2026.05.14 | Finals tiebreak: Bosch, Jeroen - Ondersteijn, Niels | 4.3 | 2026.05.14 Bosch, Jeroen (1001280) (2415) | 0 | 79.20% | 1. e4 d6 2. d4 g6 3. Nc3 a6 | |
| 2026.05.14 | Finale en 3/4e plaats: Ondersteijn, Niels - Bosch, Jeroen | 3.3 | 2026.05.14 Bosch, Jeroen (1001280) (2415) | 0 | 86.30% | 1. c4 e6 2. g3 d5 3. cxd5 exd5 | |
| 2026.05.14 | Semi Final: Freeke, Matthieu - Ondersteijn, Niels | 1.7 | 2026.05.14 Freeke, Matthieu (1013459) (2286) | 1 | 97.60% | 1. d4 Nf6 2. Bg5 c5 3. Bxf6 exf6 | |
| 2026.05.02 | Round 9: Ondersteijn, Niels - Van t Hoff, Tom | 9.8 | 2026.05.02 Van t Hoff, Tom (1060538) (2021) | 1 | 94.50% | 1. c4 Nf6 2. g3 e6 3. Bg2 d5 | |
| 2026.05.02 | Round 8: Kshirsagar, Pranav - Ondersteijn, Niels | 8.10 | 2026.05.02 Kshirsagar, Pranav (1084011) (2060) | 1 | 96.50% | 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ | |
| 2026.05.02 | Round 7: Ondersteijn, Niels - Grochal, Joey | 7.5 | 2026.05.02 Grochal, Joey (1019945) (2226) | 0 | 80.70% | 1. c4 e6 2. g3 d5 3. cxd5 exd5 | |
| 2026.05.02 | Round 6: Ondersteijn, Niels - Chua, Ethan | 6.7 | 2026.05.02 Chua, Ethan (1089250) (2086) | 1 | 86.30% | 1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 | |
| 2026.05.02 | Round 4: Ondersteijn, Niels - Van Ravensteijn, Antal | 4.7 | 2026.05.02 Van Ravensteijn, Antal (1060759) (2127) | 1 | 98.40% | 1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 | |
| 2026.05.02 | Round 3: Geboers, Jimmy - Ondersteijn, Niels | 3.7 | 2026.05.02 Geboers, Jimmy (262919) (1995) | 1 | 94.00% | 1. c4 e6 2. Nc3 Bb4 3. g3 Nf6 | |
| 2026.05.02 | Round 2: Ondersteijn, Niels - Pol, Nico | 2.8 | 2026.05.02 Pol, Nico (1064002) (1872) | 1 | 92.90% | 1. c4 Nf6 2. g3 d5 3. cxd5 Qxd5 | |
| 2026.05.02 | Round 1: Balde, Esko - Ondersteijn, Niels | 1.8 | 2026.05.02 Balde, Esko (40108350) (1750) | 1 | 95.40% | 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ | |
| 2026.05.01 | Round 5: Fridman, Daniel - Ondersteijn, Niels | 5.1 | 2026.05.01 Fridman, Daniel (11600454) (2569) | 0 | 92.80% | 1. d4 Nf6 2. Nf3 e6 3. c4 Bb4+ | |
| 2026.04.11 | Round 9: Ondersteijn, Niels - Baselmans, Sam | 1.2 | 2026.04.11 Baselmans, Sam (1048139) (2277) | 1 | 95.30% | 1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 | |
| 2026.04.06 | Grenke Chess Festival 2026 Open | 9.50 | 2026.04.06 Chittka, Julius (12954772) (2279) | 1 | 94.80% | 1. d4 Nf6 2. Nf3 e6 3. c4 Bb4+ | |
| 2026.04.06 | Grenke Chess Festival 2026 Open | 8.16 | 2026.04.06 Eugene, Floryan (20694784) (2487) | 0 | 84.60% | 1. c4 e6 2. g3 d5 3. Bg2 d4 | |
| 2026.04.05 | Grenke Chess Festival 2026 Open | 7.43 | 2026.04.05 Fuhrmann, Bahne (16244842) (2241) | 1 | 97.30% | 1. d4 Nf6 2. g3 g6 3. Bg2 Bg7 | |
| 2026.04.05 | Grenke Chess Festival 2026 Open | 6.68 | 2026.04.05 Kupriyanov, Daniel (14198533) (2231) | 1 | 93.60% | 1. c4 Nf6 2. g3 c5 3. Bg2 d5 | |
| 2026.04.04 | Grenke Chess Festival 2026 Open | 5.3 | 2026.04.04 Eljanov, Pavel (14102951) (2682) | 0 | 88.20% | 1. e4 d6 2. d4 g6 3. Nc3 a6 | |
| 2026.04.04 | Grenke Chess Festival 2026 Open | 4.62 | 2026.04.04 Kaufeld, Juergen (4648498) (2204) | 1 | 94.50% | 1. g3 e5 2. c4 Nf6 3. Bg2 c6 | |
| 2026.04.03 | Grenke Chess Festival 2026 Open | 3.51 | 2026.04.03 Le Goff, Ronan (612073) (2251) | ½ | 95.90% | 1. d4 Nf6 2. Nf3 e6 3. g3 b5 | |
| 2026.04.03 | Grenke Chess Festival 2026 Open | 2.76 | 2026.04.03 Bruns, Kai-Christian (12938025) (2170) | 1 | 90.30% | 1. c4 c6 2. g3 d5 3. Nf3 Nf6 | |
| 2026.03.07 | Round 8: Van Foreest, Lucas - Ondersteijn, Niels | 8.4 | 2026.03.07 Van Foreest, Lucas (1039792) (2519) | 0 | 86.80% | 1. e4 d6 2. d4 g6 3. Nc3 a6 | |
| 2026.02.07 | Round 7: Ondersteijn, Niels - Tondivar, Babak | 7.6 | 2026.02.07 Tondivar, Babak (12501239) (2286) | ½ | 96.90% | 1. c4 e6 2. g3 d5 3. cxd5 exd5 | |
| 2025.12.26 | Round 5: Grooten, Tommy - Ondersteijn, Niels | 5.8 | 2025.12.26 Grooten, Tommy (1068806) (2217) | 0 | - | 1. Nf3 Nf6 2. c4 e6 3. g3 d5 | |
| 2025.11.22 | Round 4: Ondersteijn, Niels - Tjiam, Dharma | 4.10 | 2025.11.22 Tjiam, Dharma (1001493) (2361) | 1 | 95.90% | 1. c4 Nf6 2. g3 e6 3. Bg2 d5 | |
| 2025.11.07 | KNSB competitie 2025/2026 | 3.6 | 2025.11.07 Grutter, Tim (1057472) (2399) | ½ | - | 1. e4 d6 2. d4 g6 3. Nc3 a6 | |
| 2025.10.25 | Round 7: Delgerdalai, Bayarjavkhlan - Ondersteijn, Niels | 7.28 | 2025.10.25 Delgerdalai, Bayarjavkhlan (23727276) (2376) | ½ | 80.40% | 1. e4 d6 2. d4 g6 3. Nc3 a6 | |
| 2025.10.24 | Round 6: Ondersteijn, Niels - Barak, Gil | 6.64 | 2025.10.24 Barak, Gil (2812690) (2211) | 1 | 95.90% | 1. c4 e6 2. g3 d5 3. cxd5 exd5 | |
| 2025.10.22 | Round 4: Ondersteijn, Niels - Wedberg, Tom | 4.76 | 2025.10.22 Wedberg, Tom (1700073) (2340) | 0 | 78.30% | 1. Nf3 d6 2. c4 e5 3. Nc3 f5 | |
| 2025.10.21 | Round 3: Ahmad, Khagan - Ondersteijn, Niels | 3.16 | 2025.10.21 Ahmad, Khagan (13431552) (2455) | ½ | 98.90% | 1. c4 e6 2. Nf3 Nf6 3. g3 d5 | |
| 2025.09.22 | KNSB competitie 2025/2026 | 1.7 | 2025.09.22 Martens, Martin (1000683) (2304) | 1 | - | 1. c4 c5 2. g3 g6 3. Bg2 Bg7 | |
| 2025.05.15 | KNSB Meesterklasse 2024-2025 | 9.2 | 2025.05.15 Froeyman, Helmut (203602) (2255) | ½ | - | 1. e4 d6 2. d4 g6 3. Nf3 Nf6 | |
| 2025.04.21 | Round 8: Ondersteijn, Niels - Maksimovic, Bojan | 8.21 | 2025.04.21 Maksimovic, Bojan (14408120) (2512) | 0 | 91.90% | 1. c4 g6 2. g3 Bg7 3. Bg2 Nf6 | |
| 2025.04.20 | Round 7: Rozen, Eytan - Ondersteijn, Niels | 7.13 | 2025.04.20 Rozen, Eytan (2816750) (2508) | 0 | 87.70% | 1. Nf3 d5 2. d4 Nf6 3. c4 e6 | |
| 2025.04.20 | Round 6: Ondersteijn, Niels - Ceres, Dragos | 6.16 | 2025.04.20 Ceres, Dragos (13905864) (2453) | 1 | 95.30% | 1. c4 e5 2. g3 Nf6 3. Bg2 c6 | |
| 2025.04.19 | Round 4: Ondersteijn, Niels - Aswath, S | 4.14 | 2025.04.19 Aswath, S (46694919) (2466) | 1 | 92.70% | 1. c4 e6 2. g3 d5 3. Bg2 d4 | |
| 2025.04.05 | KNSB Meesterklasse 2024-2025 | 8.6 | 2025.04.05 De Schampheleire, Glen (208701) (2359) | 1 | - | 1. c4 Nf6 2. g3 e6 3. Bg2 d5 | |
| 2025.03.08 | KNSB Meesterklasse 2024-2025 | 7.4 | 2025.03.08 Korneev, Oleg (4156803) (2466) | ½ | - | 1. e4 d6 2. d4 Nf6 3. Nc3 g6 | |
| 2025.02.08 | Round 6: Ondersteijn, Niels - Beerdsen, Thomas | 6.7 | 2025.02.08 Beerdsen, Thomas (1030108) (2511) | ½ | 96.00% | 1. c4 g6 2. g3 Bg7 3. Bg2 Nf6 | |
| 2024.12.14 | KNSB Meesterklasse 2024-2025 | 5.3 | 2024.12.14 Spriestersbach, Kai (16269985) (2145) | ½ | 89.10% | 1. e4 d6 2. d4 Nf6 3. Nc3 g6 | |
| 2024.11.23 | KNSB Meesterklasse 2024-2025 | 4.7 | 2024.11.23 Lenaerts, Lennert (211435) (2314) | 1 | 96.80% | 1. c4 Nf6 2. g3 e6 3. Bg2 d5 | |
| 2024.11.09 | Round 3: Slagboom, Leandro - Ondersteijn, Niels | 3.5 | 2024.11.09 Slagboom, Leandro (1065882) (2345) | 0 | 80.90% | 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 | |
| 2024.10.25 | 39th European Chess Club Cup | 6 | 2024.10.25 Olsen, Filip Boe (1440640) (2444) | 0 | 75.80% | 1. c4 e6 2. g3 d5 3. Bg2 dxc4 | |
| 2024.10.24 | 39th European Chess Club Cup | 5 | 2024.10.24 Christodoulou, Panagiotis (4214340) (2406) | 0 | 84.50% | 1. Nf3 d5 2. g3 Nc6 3. d3 e5 | |
| 2024.10.23 | 39th European Chess Club Cup | 4 | 2024.10.23 Bryakin, Mikhail (4165314) (2438) | 1 | 64.80% | 1. c4 e6 2. d4 Nf6 3. Nc3 Bb4 | |
| 2024.10.22 | 39th European Chess Club Cup | 3 | 2024.10.22 Bus, Tom (1014374) (2097) | 1 | 87.00% | 1. d4 Nf6 2. c4 c5 3. d5 b5 | |
| 2024.10.21 | 39th European Chess Club Cup | 2 | 2024.10.21 Laurusas, Tomas (12803731) (2573) | ½ | 99.20% | 1. d4 Nf6 2. c4 e6 3. Nf3 d5 | |
| 2024.10.20 | 39th European Chess Club Cup | 1 | 2024.10.20 Quinn, Rory (2501643) (2106) | 1 | 93.40% | 1. c4 e5 2. g3 Nf6 3. Bg2 c6 | |
| 2024.10.15 | Round 2: Ondersteijn, Niels - Bosman, Michiel | 1.9 | 2024.10.15 Bosman, Michiel (1000721) (2341) | 1 | 92.80% | 1. c4 e6 2. g3 d5 3. Bg2 Nf6 | |
| 2024.09.21 | Round 1: Ondersteijn, Niels - Elgersma, Onno | 1.8 | 2024.09.21 Elgersma, Onno (1053531) (2320) | 1 | 96.90% | 1. c4 Nf6 2. g3 c5 3. Bg2 d5 | |
| 2024.09.14 | Round 11: Ondersteijn, Niels - Skrobic, Dragan | 11.4 | 2024.09.14 Skrobic, Dragan (1032178) (2430) | 1 | 87.40% | 1. b3 Nf6 2. Bb2 d5 3. e3 c5 | |
| 2024.09.14 | Round 10: Van Arkel, Rogier - Ondersteijn, Niels | 10.3 | 2024.09.14 Van Arkel, Rogier (1004450) (2248) | 1 | 85.10% | 1. e4 d6 2. d4 Nf6 3. Nc3 g6 | |
| 2024.09.14 | Round 9: Ondersteijn, Niels - Smeets, Kobe | 9.5 | 2024.09.14 Smeets, Kobe (1063910) (2214) | 1 | 91.10% | 1. Nf3 d5 2. g3 Nc6 3. Bg2 e5 | |
| 2024.09.14 | Round 8: Beerdsen, Thomas - Ondersteijn, Niels | 8.2 | 2024.09.14 Beerdsen, Thomas (1030108) (2528) | 0 | 83.00% | 1. e4 d6 2. d4 Nf6 3. Nc3 g6 | |
| 2024.09.14 | Round 7: Ondersteijn, Niels - Timmermans, Mark | 7.6 | 2024.09.14 Timmermans, Mark (1026399) (2463) | ½ | 96.50% | 1. c4 Nf6 2. g3 e6 3. Bg2 d5 | |
| 2024.09.14 | Round 6: Lai, Hing Ting - Ondersteijn, Niels | 6.1 | 2024.09.14 Lai, Hing Ting (1038257) (2622) | 0 | 89.00% | 1. d4 d6 2. Nf3 Nf6 3. g3 g6 | |
| 2024.09.14 | Round 5: Bijlsma, Nick - Ondersteijn, Niels | 5.6 | 2024.09.14 Bijlsma, Nick (1007041) (2277) | 0 | 78.20% | 1. e4 d6 2. d4 Nf6 3. Nc3 g6 | |
| 2024.09.14 | Round 4: Ondersteijn, Niels - Rademakers, Evert | 4.2 | 2024.09.14 Rademakers, Evert (1025996) (2249) | 1 | 94.90% | 1. c4 a6 2. e4 c5 3. Nc3 Nc6 | |
| 2024.09.14 | Round 3: Van Batenburg, Mees - Ondersteijn, Niels | 3.5 | 2024.09.14 Van Batenburg, Mees (1078259) (1951) | 1 | 88.60% | 1. e4 d6 2. d4 Nf6 3. Nc3 g6 | |
| 2024.09.14 | Round 2: Ondersteijn, Niels - Van Foreest, Lucas | 2.3 | 2024.09.14 Van Foreest, Lucas (1039792) (2502) | 0 | 78.00% | 1. c4 e6 2. g3 d5 3. Bg2 Nf6 | |
| 2024.09.14 | Round 1: Blom, Vincent - Ondersteijn, Niels | 1.4 | 2024.09.14 Blom, Vincent (1014358) (2443) | 1 | 85.50% | 1. c4 g6 2. g3 Bg7 3. Bg2 Nf6 | |
| 2024.09.14 | Round 3: Ondersteijn, Niels - Van Foreest, Lucas | 5.1 | 2024.09.14 Van Foreest, Lucas (1039792) (2502) | ½ | 95.60% | 1. c4 e6 2. g3 d5 3. Bg2 Nf6 | |
| 2024.09.14 | Round 3: Van Delft, Merijn - Ondersteijn, Niels | 4.3 | 2024.09.14 Van Delft, Merijn (1004670) (2377) | 0 | 89.90% | 1. Nf3 d6 2. g3 Nf6 3. Bg2 g6 | |
| 2024.09.14 | Round 3: Ondersteijn, Niels - Rademakers, Evert | 3.2 | 2024.09.14 Rademakers, Evert (1025996) (2249) | 0 | 77.30% | 1. c4 h5 2. d4 h4 3. e4 c5 | |
| 2024.09.14 | Round 3: Blom, Vincent - Ondersteijn, Niels | 2.2 | 2024.09.14 Blom, Vincent (1014358) (2443) | 0 | 80.30% | 1. c4 g6 2. g3 Bg7 3. Bg2 d6 | |
| 2024.09.14 | Round 3: Ondersteijn, Niels - Admiraal, Miguoel | 1.3 | 2024.09.14 Admiraal, Miguoel (1019716) (2438) | 1 | 79.70% | 1. c4 e5 2. g3 c6 3. Nf3 e4 | |
| 2024.09.14 | Round 2: Ondersteijn, Niels - Grooten, Herman | 5.5 | 2024.09.14 Grooten, Herman (1000330) (2145) | 1 | 86.10% | 1. c4 c5 2. g3 g6 3. Bg2 Bg7 | |
| 2024.09.14 | Round 2: Beerdsen, Thomas - Ondersteijn, Niels | 4.5 | 2024.09.14 Beerdsen, Thomas (1030108) (2528) | 1 | 89.80% | 1. e4 d6 2. Nc3 Nf6 3. f4 g6 | |
| 2024.09.14 | Round 2: Ondersteijn, Niels - Van der Lende, Ilias | 3.6 | 2024.09.14 Van der Lende, Ilias (1019260) (2267) | 1 | 97.30% | 1. c4 e5 2. g3 Nf6 3. Bg2 c6 | |
| 2024.09.14 | Round 2: Eerens, Pim - Ondersteijn, Niels | 2.4 | 2024.09.14 Eerens, Pim (1011804) (2030) | 1 | 86.60% | 1. d4 d6 2. e4 Nf6 3. Nc3 g6 | |
| 2024.09.14 | Round 2: Roorda, Thijs - Ondersteijn, Niels | 1.6 | 2024.09.14 Roorda, Thijs (1027930) (2077) | 1 | 86.40% | 1. Nf3 d6 2. d4 Nf6 3. g3 g6 | |
| 2023.10.06 | European Chess Club Cup 2023 | 6.58 | 2023.10.06 De Jong, Jan-Willem (1008641) (2412) | ½ | 90.30% | 1. c4 Nf6 2. Nc3 g6 3. Nf3 Bg7 | |
| 2023.10.04 | European Chess Club Cup 2023 | 4.41 | 2023.10.04 Samadov, Read (13417444) (2492) | * | 94.00% | 1. d4 Nf6 2. c4 e6 3. Nf3 d5 | |
| 2023.10.02 | European Chess Club Cup 2023 | 2.35 | 2023.10.02 Santos Latasa, Jaime (2293307) (2647) | 0 | 90.80% | 1. e4 c5 2. Nf3 g6 3. d4 cxd4 |