Player profile
Elgersma, Onno
Dossier
140 of 144 games analyzed.
Accuracy: 90.7%
Opened e4: 25/54Opened Nf3: 24/54Opened d4: 4/54Opened c4: 1/54
Castled kingside: 109Same-side castling: 95Opposite-side castling: 8Castled queenside: 7Did not castle: 4
Played on the kingside: 50Fianchettoed kingside: 37Played in the center: 29Fianchettoed queenside: 27Played on the queenside: 21
Active pieces: 87Initiated exchanges: 77Sacrificed material: 76Kept the bishop pair: 71Space advantage: 66Backward pawn: 61Isolated pawn: 59Missed tactics: 28Avoided exchanges: 24Played gambits: 13
Openings
Click "+" to add that group to the games list below. Multiple groups can be added at once.
As White 57 games 32W 7D 18L
Sicilian Defense 12 games 8W 1D 3L
Four Knights Variation 3 games 2W 0D 1L
(unspecified)
3 games
2W
0D
1L
Kan Variation 2 games 2W 0D 0L
(unspecified)
2 games
2W
0D
0L
French Variation 2 games 1W 0D 1L
(unspecified)
2 games
1W
0D
1L
Dragon Variation 1 game 0W 0D 1L
Fianchetto Variation
1 game
0W
0D
1L
Moscow Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Nyezhmetdinov-Rossolimo Attack 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Hyperaccelerated Dragon 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Richter-Rauzer Variation 1 game 0W 1D 0L
Neo-Modern Variation, Early Deviations
1 game
0W
1D
0L
King's Indian Attack 7 games 2W 2D 3L
Sicilian Variation 3 games 0W 1D 2L
(unspecified)
3 games
0W
1D
2L
Keres Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
(unspecified) 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Double Fianchetto 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Spassky Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Caro-Kann Defense 5 games 2W 0D 3L
Two Knights Attack 2 games 0W 0D 2L
Mindeno Variation, Retreat Line
1 game
0W
0D
1L
(unspecified)
1 game
0W
0D
1L
Tartakower Variation 2 games 2W 0D 0L
(unspecified)
2 games
2W
0D
0L
Classical Variation 1 game 0W 0D 1L
Flohr Variation
1 game
0W
0D
1L
French Defense 5 games 3W 1D 1L
Classical Variation 2 games 2W 0D 0L
Shirov-Anand Variation
1 game
1W
0D
0L
(unspecified)
1 game
1W
0D
0L
Rubinstein Variation 2 games 1W 0D 1L
Fort Knox Variation
2 games
1W
0D
1L
Tarrasch Variation 1 game 0W 1D 0L
Open System, Main Line
1 game
0W
1D
0L
English Opening 4 games 4W 0D 0L
Agincourt Defense 3 games 3W 0D 0L
(unspecified)
2 games
2W
0D
0L
Neo-Catalan Declined
1 game
1W
0D
0L
Anglo-Indian Defense 1 game 1W 0D 0L
King's Knight Variation
1 game
1W
0D
0L
Ruy Lopez 4 games 1W 2D 1L
Morphy Defense 2 games 0W 2D 0L
Tarrasch Variation
1 game
0W
1D
0L
Møller Variation
1 game
0W
1D
0L
Closed 1 game 0W 0D 1L
Martinez Variation
1 game
0W
0D
1L
Berlin Defense 1 game 1W 0D 0L
Anti-Berlin Variation
1 game
1W
0D
0L
Indian Defense 2 games 1W 0D 1L
Wade-Tartakower Defense 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
London System 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Réti Opening 2 games 2W 0D 0L
Anglo-Slav Variation 2 games 2W 0D 0L
Bogoljubow Variation, Stonewall Line
1 game
1W
0D
0L
with g3
1 game
1W
0D
0L
King's Indian Attack, with e6 2 games 2W 0D 0L
(unspecified) 2 games 2W 0D 0L
(unspecified)
2 games
2W
0D
0L
Catalan Opening 2 games 1W 0D 1L
Closed 2 games 1W 0D 1L
(unspecified)
2 games
1W
0D
1L
Petrov's Defense 2 games 1W 0D 1L
Damiano Variation 1 game 1W 0D 0L
Kholmov Gambit
1 game
1W
0D
0L
Nimzowitsch Attack 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
East Indian Defense 2 games 0W 1D 1L
(unspecified) 2 games 0W 1D 1L
(unspecified)
2 games
0W
1D
1L
Zukertort Opening 2 games 1W 0D 1L
Quiet System 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
(unspecified) 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
King's Indian Defense 1 game 1W 0D 0L
Semi-Classical Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Queen's Gambit Declined 1 game 0W 0D 1L
Three Knights Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Slav Defense 1 game 1W 0D 0L
Modern Line 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Nimzo-Indian Defense 1 game 1W 0D 0L
Classical Variation 1 game 1W 0D 0L
Keres Defense
1 game
1W
0D
0L
Nimzo-Larsen Attack 1 game 0W 0D 1L
Classical Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Queen's Pawn Game 1 game 1W 0D 0L
Chigorin Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
As Black 67 games 20W 25D 22L
Queen's Gambit Declined 21 games 7W 5D 9L
Exchange Variation 10 games 4W 2D 4L
Positional Variation
8 games
3W
1D
4L
Reshevsky Variation
2 games
1W
1D
0L
Three Knights Variation 5 games 2W 0D 3L
(unspecified)
5 games
2W
0D
3L
(unspecified) 4 games 1W 2D 1L
(unspecified)
4 games
1W
2D
1L
Barmen Variation 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Semi-Tarrasch Defense 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
French Defense 17 games 6W 6D 5L
Advance Variation 4 games 3W 0D 1L
Euwe Variation
2 games
2W
0D
0L
(unspecified)
1 game
1W
0D
0L
Main Line
1 game
0W
0D
1L
Classical Variation 3 games 0W 0D 3L
Burn Variation, Morozevich Line
2 games
0W
0D
2L
(unspecified)
1 game
0W
0D
1L
Tarrasch Variation 3 games 2W 1D 0L
Open System, Euwe-Keres Line
2 games
1W
1D
0L
Chistyakov Defense
1 game
1W
0D
0L
Steinitz Variation 3 games 1W 1D 1L
Boleslavsky Variation
3 games
1W
1D
1L
Exchange Variation 2 games 0W 2D 0L
(unspecified)
2 games
0W
2D
0L
Schlechter Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
King's Indian Attack 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Ruy Lopez 6 games 2W 3D 1L
Marshall Attack 2 games 0W 2D 0L
(unspecified)
2 games
0W
2D
0L
Closed 2 games 1W 0D 1L
(unspecified)
1 game
0W
0D
1L
Delayed Exchange
1 game
1W
0D
0L
Cozio Defense 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Morphy Defense 1 game 1W 0D 0L
Steinitz Deferred
1 game
1W
0D
0L
Italian Game 5 games 0W 4D 1L
Two Knights Defense 5 games 0W 4D 1L
Modern Bishop's Opening
5 games
0W
4D
1L
English Opening 3 games 1W 0D 2L
Anglo-Indian Defense 2 games 1W 0D 1L
King's Knight Variation
2 games
1W
0D
1L
Symmetrical Variation 1 game 0W 0D 1L
Rubinstein Variation
1 game
0W
0D
1L
Four Knights Game 2 games 0W 2D 0L
Scotch Variation Accepted 1 game 0W 1D 0L
Main Line
1 game
0W
1D
0L
(unspecified) 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Sicilian Defense 2 games 1W 1D 0L
Accelerated Dragon 1 game 1W 0D 0L
Maróczy Bind
1 game
1W
0D
0L
Nyezhmetdinov-Rossolimo Attack 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Queen's Pawn Game 2 games 0W 1D 1L
Accelerated London System 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
London System 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Bogo-Indian Defense 2 games 1W 1D 0L
Grünfeld Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Wade-Smyslov Variation 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
Bird Opening 1 game 1W 0D 0L
Dutch Variation 1 game 1W 0D 0L
(unspecified)
1 game
1W
0D
0L
Nimzo-Indian Defense 1 game 0W 0D 1L
Normal Variation 1 game 0W 0D 1L
Botvinnik System
1 game
0W
0D
1L
Queen's Indian Defense 1 game 1W 0D 0L
Fianchetto Variation 1 game 1W 0D 0L
Kramnik Variation
1 game
1W
0D
0L
Indian Defense 1 game 0W 0D 1L
Anti-Nimzo-Indian 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Tarrasch Defense 1 game 0W 1D 0L
Dubov Tarrasch 1 game 0W 1D 0L
(unspecified)
1 game
0W
1D
0L
King's Indian Attack, with e6 1 game 0W 0D 1L
(unspecified) 1 game 0W 0D 1L
(unspecified)
1 game
0W
0D
1L
Catalan Opening 1 game 0W 1D 0L
Open Defense 1 game 0W 1D 0L
Classical Line
1 game
0W
1D
0L
Blunders Top 4 of 561
This player's costliest moves in analyzed games. Can you find the winning move?
Games Showing all 144 games
| Date | Event | Round | Color | Opponent | Result | Accuracy % | First moves |
|---|---|---|---|---|---|---|---|
| øøøø.øø.øø | Grenke Open | 9.18 | øøøø.øø.øø Sharma Isha (35006665) (2224) | 1 | 92.90% | 1. e4 e6 2. d4 d5 3. Nd2 c5 | |
| øøøø.øø.øø | new tournament description | 8.37 | øøøø.øø.øø Terekhov, Andrey (4121481) (2241) | 0 | 85.10% | 1. e4 c5 2. Nf3 e6 3. g3 Nc6 | |
| 2026.10.31 | Round 3: Maerevoet, Sim - Elgersma, Onno | 3.8 | 2026.10.31 Maerevoet, Sim (241725) (2462) | 0 | 85.00% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | |
| 2026.10.23 | Amsterdam Chess Open 2026 - Group A | 2.6 | 2026.10.23 Bakija, Alan (1068016) (2157) | 0 | 75.10% | 1. Nf3 d6 2. d4 Nf6 3. c4 g6 | |
| 2026.10.23 | Amsterdam Chess Open 2026 - Group A | 1.9 | 2026.10.23 Emans, Job (1051393) (2140) | 1 | 89.50% | 1. d4 Nf6 2. c4 e6 3. Nc3 d5 | |
| 2026.10.03 | Round 2: Elgersma, Onno - Bosman, Michiel | 2.10 | 2026.10.03 Bosman, Michiel (1000721) (2286) | 1 | 85.70% | 1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 | |
| 2026.09.19 | Round 1: Maatman, Nick - Elgersma, Onno | 1.5 | 2026.09.19 Maatman, Nick (1040391) (2395) | ½ | 94.70% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nge7 | |
| 2026.09.13 | Jan Timman Schaal | 4.4 | 2026.09.13 Kuipers, Stefan (1018400) (2454) | ½ | 94.90% | 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 | |
| 2026.09.13 | Jan Timman Schaal | 3.4 | 2026.09.13 Kuipers, Stefan (1018400) (2454) | 1 | 94.30% | 1. Nf3 d5 2. g3 Nf6 3. Bg2 c6 | |
| 2026.09.13 | Jan Timman Schaal | 2.8 | 2026.09.13 Mollema, Thomas (1034987) (2240) | ½ | 86.20% | 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 | |
| 2026.09.13 | Jan Timman Schaal | 1.8 | 2026.09.13 Mollema, Thomas (1034987) (2240) | 1 | 88.90% | 1. Nf3 Nf6 2. c4 e6 3. g3 d5 | |
| 2026.07.19 | Amsterdam Chess Festival 2026 - Groep A | 9.7 | 2026.07.19 Labruyere, Roger (1059505) (2202) | ½ | 90.20% | 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 | |
| 2026.07.18 | Amsterdam Chess Festival 2026 - Groep A | 8.2 | 2026.07.18 Schoorl, Rob (1009508) (2284) | 0 | 89.80% | 1. Nf3 g6 2. e4 c5 3. d4 cxd4 | |
| 2026.07.16 | Amsterdam Chess Festival 2026 - Groep A | 6.10 | 2026.07.16 Ten Kate, Gustav (1095781) (2019) | 1 | 96.50% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2026.07.15 | Amsterdam Chess Festival 2026 - Groep A | 5.5 | 2026.07.15 Schilstra, Laurens (1043218) (2194) | 0 | 90.20% | 1. e4 c6 2. Nc3 d5 3. Nf3 Bg4 | |
| 2026.07.14 | Amsterdam Chess Festival 2026 - Groep A | 4.7 | 2026.07.14 Van der Plas, Rob (1006126) (2119) | 1 | 92.70% | 1. d4 Nf6 2. c4 e6 3. Nc3 d5 | |
| 2026.07.13 | Amsterdam Chess Festival 2026 - Groep A | 3.13 | 2026.07.13 Khatniuk, Anastasiia (14179105) (2022) | 1 | 96.80% | 1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 | |
| 2026.07.12 | Amsterdam Chess Festival 2026 - Groep A | 2.3 | 2026.07.12 Wunnink, Michael (1005448) (2187) | 0 | 87.40% | 1. Nf3 Nf6 2. c4 c5 3. g3 Nc6 | |
| 2026.07.11 | Amsterdam Chess Festival 2026 - Groep A | 1.5 | 2026.07.11 Brienen, Jacob (1094548) (2090) | 1 | 91.20% | 1. Nf3 c5 2. e4 e6 3. d4 cxd4 | |
| 2026.04.11 | Round 9: Braun, Christian - Elgersma, Onno | 1.3 | 2026.04.11 Braun, Christian (4692098) (2396) | ½ | 97.90% | 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 | |
| 2026.03.07 | Round 8: Elgersma, Onno - Korneev, Oleg | 8.1 | 2026.03.07 Korneev, Oleg (4156803) (2443) | ½ | 86.90% | 1. Nf3 d5 2. g3 Bg4 3. Bg2 Nd7 | |
| 2026.02.07 | Round 7: Victor, Julian - Elgersma, Onno | 7.7 | 2026.02.07 Victor, Julian (257257) (2214) | 1 | 93.70% | 1. d4 Nf6 2. c4 e6 3. Nc3 d5 | |
| 2026.01.31 | Tata Steel Chess Qualifiers | 8.4 | 2026.01.31 Gloeckler, Christian (34608966) (2444) | 0 | 78.70% | 1. c4 Nf6 2. g3 e6 3. Bg2 d5 | |
| 2026.01.30 | Tata Steel Chess Qualifiers | 7.2 | 2026.01.30 Beukema, Stefan (1024523) (2394) | 1 | 97.10% | 1. f4 d5 2. Nf3 c5 3. g3 g6 | |
| 2026.01.27 | Tata Steel Chess Qualifiers | 6.4 | 2026.01.27 Van Foreest, Machteld (1051563) (2330) | 1 | 90.90% | 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 | |
| 2026.01.27 | Tata Steel Chess Qualifiers | 5.3 | 2026.01.27 Tudor, Henry Edward (2409836) (2434) | 0 | 92.90% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | |
| 2026.01.26 | Tata Steel Chess Qualifiers | 4.4 | 2026.01.26 Hrbek, Stepan (393479) (2454) | 0 | 83.70% | 1. d4 Nf6 2. Nf3 d5 3. c4 e6 | |
| 2026.01.25 | Tata Steel Chess Qualifiers | 3.2 | 2026.01.25 Baselmans, Luuk (1051008) (2406) | ½ | 89.20% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2026.01.24 | Tata Steel Chess Qualifiers | 2.2 | 2026.01.24 Lohia, Sohum (5819369) (2410) | 1 | 94.40% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | |
| 2026.01.15 | Tata Steel Chess Qualifiers | 9.1 | 2026.01.15 Carow, Johannes, Dr. (24692050) (2470) | 0 | 95.50% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | |
| 2025.12.29 | Round 9: Krishnan, Ritvik - Elgersma, Onno | 9.10 | 2025.12.29 Krishnan, Ritvik (45055297) (2265) | 0 | 88.10% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | |
| 2025.12.28 | Round 8: Elgersma, Onno - De Jong, Migchiel | 8.14 | 2025.12.28 De Jong, Migchiel (1002848) (2263) | 1 | 94.40% | 1. e4 c5 2. Nf3 e6 3. d4 cxd4 | |
| 2025.12.28 | Round 7: Duijker, Rick - Elgersma, Onno | 7.10 | 2025.12.28 Duijker, Rick (1010565) (2155) | 0 | 90.30% | 1. e4 e6 2. d4 d5 3. Nc3 Nf6 | |
| 2025.12.26 | Round 6: Elgersma, Onno - Schuricht, Emil Frederick | 6.13 | 2025.12.26 Schuricht, Emil Frederick (16270185) (2262) | 1 | 90.90% | 1. Nf3 d5 2. c4 e6 3. g3 dxc4 | |
| 2025.12.26 | Round 5: Elgersma, Onno - Van der Hagen, Loek | 5.10 | 2025.12.26 Van der Hagen, Loek (1052853) (2218) | 1 | - | 1. Nf3 Nf6 2. d4 e6 3. Bf4 b6 | |
| 2025.12.24 | Round 5: Van Roon, Sjoerd - Elgersma, Onno | 5.10 | 2025.12.24 Van Roon, Sjoerd (1051075) (2284) | 0 | 90.00% | 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 | |
| 2025.12.24 | Round 4: Elgersma, Onno - Wempe, Joost | 4.14 | 2025.12.24 Wempe, Joost (1005502) (2212) | 1 | 96.80% | 1. Nf3 d5 2. g3 c6 3. Bg2 Bg4 | |
| 2025.12.23 | Round 3: Kazakouski, Valery - Elgersma, Onno | 3.5 | 2025.12.23 Kazakouski, Valery (13507443) (2585) | 0 | 89.00% | 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 | |
| 2025.12.22 | Round 2: Advaitt Srikant Koduri - Elgersma, Onno | 2.17 | 2025.12.22 Advaitt Srikant Koduri (25185454) (2192) | 1 | 97.30% | 1. Nf3 Nf6 2. c4 e6 3. Nc3 d5 | |
| 2025.12.21 | Round 1: Elgersma, Onno - Bakija, Alan | 1.19 | 2025.12.21 Bakija, Alan (1068016) (2139) | ½ | 92.20% | 1. Nf3 d5 2. g3 c5 3. Bg2 Nf6 | |
| 2025.11.22 | Round 4: Brookes, Christopher - Elgersma, Onno | 4.6 | 2025.11.22 Brookes, Christopher (4669355) (2195) | 0 | 92.30% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2025.11.07 | KNSB competitie 2025/2026 | 3.4 | 2025.11.07 Ten Hertog, Hugo (1026356) (2522) | 0 | - | 1. e4 c6 2. Nf3 d5 3. Nc3 g6 | |
| 2025.10.04 | Round 2: Elgersma, Onno - Rijnaarts, Sjef | 2.7 | 2025.10.04 Rijnaarts, Sjef (1014870) (2277) | 1 | 92.70% | 1. Nf3 d5 2. g3 Nf6 3. Bg2 c6 | |
| 2025.09.20 | Round 1: Sirin, Atakan - Elgersma, Onno | 1.9 | 2025.09.20 Sirin, Atakan (6303307) (2335) | 0 | 76.80% | 1. d4 d5 2. Nc3 e6 3. e4 Nf6 | |
| 2025.07.30 | Round 9: Maatman, Nick - Elgersma, Onno | 9.2 | 2025.07.30 Maatman, Nick (1040391) (2408) | 1 | 97.60% | 1. Nf3 Nf6 2. g3 b6 3. d4 Bb7 | |
| 2025.07.29 | Round 8: Elgersma, Onno - De Boer, Eelke | 8.2 | 2025.07.29 De Boer, Eelke (1048120) (2434) | 0 | 92.80% | 1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 | |
| 2025.07.28 | Round 7: Flom, Gabriel - Elgersma, Onno | 7.4 | 2025.07.28 Flom, Gabriel (621650) (2455) | 1 | 96.10% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2025.07.27 | Round 6: Elgersma, Onno - Baselmans, Luuk | 6.4 | 2025.07.27 Baselmans, Luuk (1051008) (2390) | 1 | 89.90% | 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 | |
| 2025.07.26 | Round 5: Madularea, David - Elgersma, Onno | 5.7 | 2025.07.26 Madularea, David (1070215) (2218) | ½ | 93.50% | 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 | |
| 2025.07.25 | Round 4: Elgersma, Onno - Duijker, Rick | 4.7 | 2025.07.25 Duijker, Rick (1010565) (2158) | 1 | 96.80% | 1. e4 e5 2. Nf3 Nf6 3. Nxe5 Nxe4 | |
| 2025.07.24 | Round 3: Albers, Sasa - Elgersma, Onno | 3.8 | 2025.07.24 Albers, Sasa (1068253) (2252) | ½ | 98.10% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2025.07.23 | Round 2: Elgersma, Onno - Eckardt, Joshua | 2.17 | 2025.07.23 Eckardt, Joshua (12941646) (2259) | 1 | 92.70% | 1. e4 e6 2. d4 d5 3. Nc3 Nf6 | |
| 2025.07.22 | Round 1: Ten Dam, Bram - Elgersma, Onno | 1.9 | 2025.07.22 Ten Dam, Bram (40104877) (2139) | ½ | 94.00% | 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 | |
| 2025.06.09 | Round 7: Elgersma, Onno - Van Batenburg, Mees | 7.9 | 2025.06.09 Van Batenburg, Mees (1078259) (2218) | 1 | 93.50% | 1. Nf3 d5 2. g3 e6 3. Bg2 Nf6 | |
| 2025.06.08 | Round 4: Donker, Roel - Elgersma, Onno | 4.10 | 2025.06.08 Donker, Roel (1031660) (2213) | 0 | 82.10% | 1. d4 e6 2. c4 d5 3. Nf3 Nf6 | |
| 2025.06.07 | Round 3: Elgersma, Onno - Bok, Benjamin | 3.2 | 2025.06.07 Bok, Benjamin (1017063) (2582) | 0 | 88.30% | 1. Nf3 d5 2. b3 Bf5 3. Bb2 e6 | |
| 2025.06.07 | Round 2: Groenewoud, Joel - Elgersma, Onno | 2.9 | 2025.06.07 Groenewoud, Joel (1087746) (2159) | 1 | 85.40% | 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 | |
| 2025.06.06 | Round 1: Elgersma, Onno - Terlouw, Wouter | 1.11 | 2025.06.06 Terlouw, Wouter (1087401) (2196) | 1 | 90.10% | 1. Nf3 Nf6 2. g3 b5 3. Bg2 Bb7 | |
| 2025.06.01 | Round 6: Kokje, Joris - Elgersma, Onno | 6.5 | 2025.06.01 Kokje, Joris (1051024) (2268) | 0 | 90.50% | 1. d4 e6 2. c4 Nf6 3. Nf3 d5 | |
| 2025.06.01 | Round 5: Elgersma, Onno - Grooten, Herman | 5.6 | 2025.06.01 Grooten, Herman (1000330) (2189) | 1 | 94.30% | 1. e4 c5 2. Nf3 e6 3. d4 cxd4 | |
| 2025.05.31 | Round 4: Ercan, Selman - Elgersma, Onno | 4.11 | 2025.05.31 Ercan, Selman (1059009) (2056) | 1 | 98.50% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | |
| 2025.05.31 | Round 3: Winter, Sven - Elgersma, Onno | 3.11 | 2025.05.31 Winter, Sven (1092375) (2054) | ½ | 87.70% | 1. e4 e6 2. d4 d5 3. Nd2 c5 | |
| 2025.05.29 | sofia25 | 9.4 | 2025.05.29 Nikolov, Momchil (2905710) (2436) | 1 | 99.00% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | |
| 2025.05.28 | sofia25 | 8.8 | 2025.05.28 Gkavardinas, Antonios (25883097) (2313) | 1 | 92.30% | 1. e4 c5 2. Nf3 d6 3. Bb5+ Nd7 | |
| 2025.05.27 | sofia25 | 7.12 | 2025.05.27 Velikov, Nikola (2932474) (1872) | 1 | 93.60% | 1. c4 e6 2. Nc3 d5 3. d4 Nf6 | |
| 2025.05.26 | sofia25 | 6.8 | 2025.05.26 Krishnan, Ritvik (45055297) (2266) | 0 | 92.10% | 1. Nf3 d5 2. g3 Nf6 3. Bg2 c5 | |
| 2025.05.26 | sofia25 | 5.7 | 2025.05.26 Ribstein, Orel (2826534) (2118) | ½ | 93.40% | 1. d4 e6 2. c4 d5 3. Nf3 Nf6 | |
| 2025.05.25 | sofia25 | 4.10 | 2025.05.25 Nikolov, Sasho (2900297) (2257) | 1 | 93.00% | 1. Nf3 Nc6 2. d4 d5 3. Bf4 Bg4 | |
| 2025.05.24 | sofia25 | 3.15 | 2025.05.24 Aydemir, Umut (34565930) (2140) | 1 | 94.80% | 1. e4 e6 2. d4 d5 3. Nd2 c5 | |
| 2025.05.23 | sofia25 | 2.19 | 2025.05.23 Kishore Kumar Jaganathan (46683801) (2157) | ½ | 97.60% | 1. Nf3 Nf6 2. d4 g6 3. Nbd2 d5 | |
| 2025.05.23 | sofia25 | 1.8 | 2025.05.23 Boeren, Jurriaan (1067478) (2104) | ½ | 92.00% | 1. e4 c5 2. Nf3 Nc6 3. Bb5 e6 | |
| 2025.05.13 | Round 9: Lammens, Tim - Elgersma, Onno | 9.3 | 2025.05.13 Lammens, Tim (1008803) (2253) | ½ | - | 1. c4 c5 2. Nf3 Nf6 3. Nc3 Nc6 | |
| 2025.04.05 | KNSB Meesterklasse 2024-2025 | 8.7 | 2025.04.05 Los, Sander (1000527) (2266) | 0 | - | 1. Nf3 Nf6 2. d4 g6 3. Nbd2 Bg7 | |
| 2025.03.08 | Round 7: Klaska, Philipp Leon - Elgersma, Onno | 7.7 | 2025.03.08 Klaska, Philipp Leon (16238044) (2250) | 0 | 90.80% | 1. e4 e6 2. d4 d5 3. Nc3 Nf6 | |
| 2025.02.08 | Round 6: Elgersma, Onno - Ernst, Sipke | 6.3 | 2025.02.08 Ernst, Sipke (1004689) (2514) | 0 | 83.10% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2024.12.30 | Round 9: Schoppen, Casper - Elgersma, Onno | 9.6 | 2024.12.30 Schoppen, Casper (1046730) (2539) | ½ | 98.90% | 1. e4 e6 2. d4 d5 3. exd5 exd5 | |
| 2024.12.29 | Round 8: Elgersma, Onno - Maatman, Nick | 8.3 | 2024.12.29 Maatman, Nick (1040391) (2375) | 0 | 89.70% | 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 | |
| 2024.12.28 | Round 7: Manish Anto Cristiano F - Elgersma, Onno | 7.5 | 2024.12.28 Manish Anto Cristiano F (25095927) (2296) | ½ | 98.20% | 1. e4 e6 2. d4 d5 3. Nc3 Nf6 | |
| 2024.12.27 | Round 6: Elgersma, Onno - Smeets, Kobe | 6.6 | 2024.12.27 Smeets, Kobe (1063910) (2349) | 1 | 92.40% | 1. Nf3 d5 2. c4 e6 3. g3 dxc4 | |
| 2024.12.26 | Round 5: Narayanan S L - Elgersma, Onno | 5.1 | 2024.12.26 Narayanan S L (5058422) (2647) | 0 | 89.60% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | |
| 2024.12.24 | Round 4: Elgersma, Onno - Palchuk, Andrii | 4.5 | 2024.12.24 Palchuk, Andrii (14176688) (2372) | 1 | 97.50% | 1. e4 c5 2. Nf3 Nc6 3. Bb5 Nf6 | |
| 2024.12.23 | Round 3: De Winter, Arthur - Elgersma, Onno | 3.2 | 2024.12.23 De Winter, Arthur (1069020) (2446) | ½ | 91.60% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | |
| 2024.12.22 | Round 2: Ten Dam, Bram - Elgersma, Onno | 2.10 | 2024.12.22 Ten Dam, Bram (40104877) (2002) | 1 | 93.30% | 1. e4 e6 2. d4 d5 3. e5 c5 | |
| 2024.12.21 | Round 1: Elgersma, Onno - Van Helvoort, Rob | 1.19 | 2024.12.21 Van Helvoort, Rob (1005596) (2135) | 1 | 89.40% | 1. e4 c5 2. Nf3 e6 3. d4 cxd4 | |
| 2024.12.14 | Round 5: Elgersma, Onno - Willemze, Thomas | 5.8 | 2024.12.14 Willemze, Thomas (1007238) (2328) | 1 | 83.90% | 1. e4 c6 2. Nc3 d5 3. d4 dxe4 | |
| 2024.11.23 | Round 4: Vandenbussche, Thibaut - Elgersma, Onno | 4.9 | 2024.11.23 Vandenbussche, Thibaut (204412) (2433) | 1 | 97.30% | 1. e4 e6 2. d4 d5 3. e5 c5 | |
| 2024.11.09 | KNSB Meesterklasse 2024-2025 | 3.5 | 2024.11.09 Baselmans, Luuk (1051008) (2325) | 0 | 85.90% | 1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 | |
| 2024.11.02 | Amsterdam Chess Open 2024 | 3.7 | 2024.11.02 Bruns, Kai-Christian (12938025) (2088) | 0 | 91.20% | 1. e4 c5 2. Nf3 e6 3. d4 cxd4 | |
| 2024.11.01 | Amsterdam Chess Open 2024 | 2.8 | 2024.11.01 Jonsson, Gauti Pall (2309092) (2137) | ½ | 96.90% | 1. e4 e6 2. d4 d5 3. Bd3 dxe4 | |
| 2024.09.21 | Round 1: Ondersteijn, Niels - Elgersma, Onno | 1.8 | 2024.09.21 Ondersteijn, Niels (1011162) (2347) | 0 | 90.70% | 1. c4 Nf6 2. g3 c5 3. Bg2 d5 | |
| 2024.09.14 | Round 11: Elgersma, Onno - Admiraal, Miguoel | 11.6 | 2024.09.14 Admiraal, Miguoel (1019716) (2438) | 0 | 76.40% | 1. e4 c6 2. d4 d5 3. Nc3 dxe4 | |
| 2024.09.14 | Round 10: Grochal, Joey - Elgersma, Onno | 10.1 | 2024.09.14 Grochal, Joey (1019945) (2225) | 0 | 77.60% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | |
| 2024.09.14 | Round 9: Van Delft, Merijn - Elgersma, Onno | 9.6 | 2024.09.14 Van Delft, Merijn (1004670) (2377) | 1 | 91.90% | 1. e4 e6 2. d4 d5 3. Nc3 Nf6 | |
| 2024.09.14 | Round 8: Elgersma, Onno - Kazarjan, Gachatur | 8.2 | 2024.09.14 Kazarjan, Gachatur (1068750) (1942) | 1 | 83.90% | 1. Nf3 Nf6 2. c4 e6 3. e3 Be7 | |
| 2024.09.14 | Round 7: Kerkmeester, Cedric - Elgersma, Onno | 7.5 | 2024.09.14 Kerkmeester, Cedric (1072579) (1954) | ½ | 92.80% | 1. e4 e6 2. d4 d5 3. exd5 exd5 | |
| 2024.09.14 | Round 6: Elgersma, Onno - Grooten, Tommy | 6.3 | 2024.09.14 Grooten, Tommy (1068806) (1989) | 1 | 95.50% | 1. e4 c5 2. Nf3 e6 3. g3 g6 | |
| 2024.09.14 | Round 5: Grooten, Herman - Elgersma, Onno | 5.4 | 2024.09.14 Grooten, Herman (1000330) (2145) | 1 | 95.50% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | |
| 2024.09.14 | Round 4: Elgersma, Onno - Ratsma, Midas | 4.4 | 2024.09.14 Ratsma, Midas (1032283) (2172) | 1 | 95.10% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 | |
| 2024.09.14 | Round 3: Schilstra, Laurens - Elgersma, Onno | 3.3 | 2024.09.14 Schilstra, Laurens (1043218) (2178) | 1 | 91.10% | 1. e4 e6 2. d4 d5 3. Nd2 c5 | |
| 2024.09.14 | Round 2: Elgersma, Onno - Tikranian, Alik | 2.5 | 2024.09.14 Tikranian, Alik (1040952) (2284) | 1 | 95.90% | 1. Nf3 Nf6 2. e3 c5 3. b3 b6 | |
| 2024.09.14 | Round 1: Koster, Ramon - Elgersma, Onno | 1.2 | 2024.09.14 Koster, Ramon (1008544) | 0 | 88.20% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | |
| 2024.09.14 | Round 2: Elgersma, Onno - Smeets, Kobe | 5.2 | 2024.09.14 Smeets, Kobe (1063910) (2214) | 0 | 78.30% | 1. Nf3 d5 2. e3 Nf6 3. b3 Bf5 | |
| 2024.09.14 | Round 2: Verhoeven, Robin - Elgersma, Onno | 4.2 | 2024.09.14 Verhoeven, Robin (1054775) (2016) | 1 | 84.80% | 1. e4 e6 2. d4 d5 3. e5 c5 | |
| 2024.09.14 | Round 2: Elgersma, Onno - Schoorl, Rob | 3.3 | 2024.09.14 Schoorl, Rob (1009508) (2352) | 1 | 63.40% | 1. e4 c5 2. Nf3 g6 3. c3 d5 | |
| 2024.09.14 | Round 2: Van Foreest, Lucas - Elgersma, Onno | 2.1 | 2024.09.14 Van Foreest, Lucas (1039792) (2502) | 0 | 87.50% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | |
| 2024.09.14 | Round 2: Lai, Hing Ting - Elgersma, Onno | 1.3 | 2024.09.14 Lai, Hing Ting (1038257) (2622) | 0 | 56.40% | 1. d4 d5 2. Bf4 Nf6 3. e3 c5 | |
| 2024.07.18 | Amsterdam Science Park 2024 | 6.6 | 2024.07.18 Wunnink, Michael (1005448) (2154) | ½ | 92.20% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | |
| 2024.07.17 | Amsterdam Science Park 2024 | 5.4 | 2024.07.17 Duson, Robin (1055038) (2148) | ½ | 91.70% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | |
| 2024.07.16 | Amsterdam Science Park 2024 | 4.3 | 2024.07.16 Kanis, Sierk (1056859) (2105) | ½ | 92.60% | 1. d4 e6 2. Nf3 Nf6 3. Bf4 d5 | |
| 2024.07.15 | Amsterdam Science Park 2024 | 3.2 | 2024.07.15 Dimitrijeski, Kristian (4627229) (2158) | ½ | 94.90% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | |
| 2024.07.14 | Amsterdam Science Park 2024 | 2.4 | 2024.07.14 Groenewoud, Joel (1087746) (2095) | 1 | 93.00% | 1. e4 c6 2. d4 d5 3. Nd2 dxe4 | |
| 2024.04.11 | Round 9: Nguyen, Piotr - Elgersma, Onno | 2024.04.11 Nguyen, Piotr (1127993) (2398) | 0 | 88.80% | 1. g3 Nf6 2. Bg2 d5 3. Nf3 e6 | ||
| 2024.04.09 | Round 6: Elgersma, Onno - Priansh Das | 2024.04.09 Priansh Das (45029946) (2234) | ½ | 96.70% | 1. e4 e6 2. d4 d5 3. Nd2 c5 | ||
| 2024.04.09 | Round 5: Keenan, Cathal - Elgersma, Onno | 2024.04.09 Keenan, Cathal (2516853) (2004) | ½ | 88.00% | 1. e4 e6 2. d3 d5 3. Qe2 Nf6 | ||
| 2024.04.07 | Round 3: Vlachos, Anatole - Elgersma, Onno | 2024.04.07 Vlachos, Anatole (26093189) (2482) | 0 | 90.10% | 1. e4 e6 2. d4 d5 3. Nc3 Nf6 | ||
| 2024.03.31 | Grenke Chess Open 2024 | 7.25 | 2024.03.31 Costa, Leonardo (16213955) (2476) | 0 | 94.50% | 1. e4 e6 2. d4 d5 3. e5 c5 | |
| 2024.03.31 | new tournament description | 6.30 | 2024.03.31 Karamsetty, Jeevan (2025337) (2222) | 1 | 96.60% | 1. e4 e6 2. d4 d5 3. Nc3 Nf6 | |
| 2024.03.30 | Grenke Open | 5.5 | 2024.03.30 Collins, Adam (2512300) (2194) | 1 | 97.60% | 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ | |
| 2023.10.28 | Hoogeveen Open 2023 | 9.1 | 2023.10.28 Lodici, Lorenzo (884189) (2537) | 0 | 91.70% | 1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 | |
| 2023.10.27 | Hoogeveen Open 2023 | 8.4 | 2023.10.27 Kazarjan, Gachatur (1068750) (1970) | 1 | 97.60% | 1. e4 c5 2. Nf3 d6 3. Nc3 Nf6 | |
| 2023.10.26 | Hoogeveen Open 2023 | 7.7 | 2023.10.26 Mueer, Sebastian (24622001) (2230) | 1 | 97.90% | 1. e4 c5 2. Nf3 e6 3. g3 Nc6 | |
| 2023.10.25 | Hoogeveen Open 2023 | 6.5 | 2023.10.25 Van Foreest, Machteld (1051563) (2266) | ½ | 98.60% | 1. e4 e6 2. Qe2 c5 3. Nf3 Nc6 | |
| 2023.10.25 | Hoogeveen Open 2023 | 5.3 | 2023.10.25 Ernst, Sipke (1004689) (2551) | 0 | 88.90% | 1. Nf3 d5 2. e3 Nf6 3. b3 e6 | |
| 2023.10.24 | Hoogeveen Open 2023 | 4.5 | 2023.10.24 Maatman, Nick (1040391) (2382) | 1 | 93.60% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | |
| 2023.10.23 | Hoogeveen Open 2023 | 3.7 | 2023.10.23 Hoffman, Ron (1007599) (2032) | 1 | 94.10% | 1. e4 c5 2. Nf3 a6 3. c4 Nc6 | |
| 2023.10.22 | Hoogeveen Open 2023 | 2.11 | 2023.10.22 Nijdam, Brian (1081020) (1918) | 1 | 91.30% | 1. e4 e6 2. d3 d5 3. Nd2 c5 | |
| 2023.10.21 | Hoogeveen Open 2023 | 1.12 | 2023.10.21 Van Rootselaar, Rik (1088572) (2015) | 0 | 83.80% | 1. d4 d5 2. c4 e6 3. Nf3 Nf6 | |
| 2023.12.30 | Round 9: Onno Elgersma - Machteld Van Foreest | 2023.12.30 Machteld Van Foreest (2344) | 0 | 82.10% | 1. e4 c5 2. Nf3 e6 3. g3 Nc6 | ||
| 2023.12.29 | Round 8: Michal Krasenkow - Onno Elgersma | 2023.12.29 Michal Krasenkow (2532) | ½ | 91.60% | 1. d4 Nf6 2. c4 e6 3. Nc3 d5 | ||
| 2023.12.28 | Round 7: Onno Elgersma - Rob Van Helvoort | 2023.12.28 Rob Van Helvoort (2098) | 1 | 93.50% | 1. e4 e6 2. d4 d5 3. Nd2 dxe4 | ||
| 2023.12.27 | Round 6: Teimur Toktomushev - Onno Elgersma | 2023.12.27 Teimur Toktomushev (2249) | ½ | 93.00% | 1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ | ||
| 2023.12.26 | Round 5: Onno Elgersma - Amir Nicolai | 2023.12.26 Amir Nicolai (2156) | ½ | 96.30% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | ||
| 2023.12.24 | Round 4: Trisha Kanyamarala - Onno Elgersma | 2023.12.24 Trisha Kanyamarala (2184) | ½ | 85.20% | 1. d4 Nf6 2. c4 e6 3. Nf3 d5 | ||
| 2023.12.23 | Round 3: Onno Elgersma - Sergei Tiviakov | 2023.12.23 Sergei Tiviakov (2536) | 0 | 90.00% | 1. e4 e6 2. d4 d5 3. Nd2 dxe4 | ||
| 2023.12.22 | Round 2: Titas Stremavicius - Onno Elgersma | 2023.12.22 Titas Stremavicius (2550) | ½ | 89.90% | 1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 | ||
| 2023.07.23 | Round 9: Sierk Kanis - Onno Elgersma | 2023.07.23 Sierk Kanis | 0 | 86.90% | 1. d4 Nf6 2. c4 e6 3. Nc3 d5 | ||
| 2023.07.21 | Round 8: Onno Elgersma - Merijn Van Delft | 2023.07.21 Merijn Van Delft | ½ | 97.70% | 1. e4 c5 2. Nf3 d6 3. d4 cxd4 | ||
| 2023.07.21 | Round 7: Jimmy Van Zutphen - Onno Elgersma | 2023.07.21 Jimmy Van Zutphen | 1 | 95.20% | 1. d4 d5 2. Bf4 Nf6 3. e3 e6 | ||
| 2023.07.20 | Round 6: Nico Zwirs - Onno Elgersma | 2023.07.20 Nico Zwirs | 0 | 90.80% | 1. e4 c6 2. d4 d5 3. exd5 cxd5 | ||
| 2023.07.19 | Round 5: Onno Elgersma - Ed Baarslag | 2023.07.19 Ed Baarslag | 1 | 96.60% | 1. e4 c6 2. Nf3 d5 3. Nc3 dxe4 | ||
| 2023.07.18 | Round 4: Nick Manshanden - Onno Elgersma | 2023.07.18 Nick Manshanden | 1 | 92.70% | 1. d4 Nf6 2. c4 e6 3. Nc3 d5 | ||
| 2023.07.16 | Round 2: Max Merbis - Onno Elgersma | 2023.07.16 Max Merbis | 0 | 90.00% | 1. d4 d5 2. c4 e6 3. Nc3 Nf6 | ||
| 2023.07.15 | Round 1: Onno Elgersma - Noah Ritzerveld | 2023.07.15 Noah Ritzerveld | 1 | 90.20% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 | ||
| 2023.06.25 | HSG Open 2023 A | 6 | 2023.06.25 Jan Roebers | ½ | 96.10% | 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 |