Prepare against Harmen Jonkman
GM · NLD · World #4,449 classical · FIDE ID 1002708
When preparing against Harmen Jonkman, expect 1.e4 in 93% of White games. Against 1.e4 the reply is 1...e5 (97% of games); against 1.d4, 1...d5 (89%). Lowest win rate among frequent openings: Catalan as Black, 12.5% over 16 games.
Our database contains 1,766 games by Harmen Jonkman, covering Apr 2003 to Sep 2026. Below you'll find Harmen Jonkman's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Harmen Jonkman before a game. You can open the same data in the free interactive preparation workstation, which builds a move-by-move opening tree from every game.
Ratings
| Time control | Current | Peak | Peak date |
|---|---|---|---|
| Classical | 2,289 | 2,470 | Jan 2006 |
| Rapid | 2,351 | 2,377 | Jun 2022 |
| Blitz | 2,368 | 2,402 | Aug 2017 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 1,766 | 785 | 410 | 571 | 44.5% |
| As White | 904 | 428 | 206 | 270 | 47.3% |
| As Black | 862 | 357 | 204 | 301 | 41.4% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Harmen Jonkman's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Harmen Jonkman's side.
First moves as White (904 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| e4 | 838 | 92.7% | 59.4% |
| d4 | 63 | 7.0% | 50.8% |
| Nf3 | 2 | 0.2% | 50.0% |
| g3 | 1 | 0.1% | 0.0% |
Main lines as White
- 1.e4 — 93% of White games, 59.4% score
- …c5 (39% of these games) — Jonkman usually continues c3 (60.1% score)
- …e5 (19% of these games) — Jonkman usually continues Nf3 (51.3% score)
- …e6 (17% of these games) — Jonkman usually continues d4 (63.9% score)
- 1.d4 — 7% of White games, 50.8% score
- …Nf6 (54% of these games) — Jonkman usually continues Nf3 (53.2% score)
- …d5 (27% of these games) — Jonkman usually continues Nf3 (53.8% score)
- …e6 (6% of these games) — Jonkman usually continues g3 (75.0% score)
As Black against 1.e4 (377 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| e5 | 364 | 96.6% | 54.5% |
| e6 | 9 | 2.4% | 61.1% |
| Nf6 | 1 | 0.3% | 0.0% |
| g6 | 1 | 0.3% | 50.0% |
| c6 | 1 | 0.3% | 50.0% |
As Black against 1.d4 (262 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d5 | 234 | 89.3% | 61.8% |
| Nf6 | 18 | 6.9% | 44.4% |
| e6 | 8 | 3.1% | 50.0% |
| c6 | 1 | 0.4% | 100.0% |
| b6 | 1 | 0.4% | 0.0% |
Harmen Jonkman's chess games
All 1,766 games by Harmen Jonkman in the Chess.ceo database (Apr 2003 - Sep 2026) are free to browse, search and replay: filter by opening, opponent, event or date on the player page, or step through any game on the analysis board. Record: 785 wins, 410 draws, 571 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| B22 | Sicilian: Alapin | 282 | 131/77/74 | 46.5% |
| C02 | French: Advance Variation | 135 | 73/24/38 | 54.1% |
| C33 | King's Gambit | 66 | 33/7/26 | 50.0% |
| B09 | Pirc Defense | 36 | 17/8/11 | 47.2% |
| B19 | Caro-Kann: Classical | 34 | 14/12/8 | 41.2% |
| B06 | Modern Defense | 34 | 15/7/12 | 44.1% |
| B50 | Sicilian | 32 | 19/5/8 | 59.4% |
| B02 | Alekhine Defense | 28 | 12/7/9 | 42.9% |
| D02 | London System | 26 | 12/3/11 | 46.2% |
| C50 | Italian Game | 25 | 14/9/2 | 56.0% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| D27 | Queen's Gambit Accepted | 143 | 74/21/48 | 51.7% |
| C67 | Ruy Lopez: Berlin Defense | 103 | 34/30/39 | 33.0% |
| D27 | Queen's Pawn Game | 65 | 27/16/22 | 41.5% |
| C45 | Scotch Game | 53 | 21/11/21 | 39.6% |
| C56 | Italian Game | 51 | 28/9/14 | 54.9% |
| D36 | Indian Defense | 36 | 9/7/20 | 25.0% |
| A13 | English Opening | 31 | 12/10/9 | 38.7% |
| C63 | Ruy Lopez: Schliemann | 29 | 10/7/12 | 34.5% |
| A07 | Réti Opening | 22 | 7/7/8 | 31.8% |
| E05 | Catalan | 16 | 2/7/7 | 12.5% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Jun 2005 | Boris Avrukh | 2,642 | 3rd Bajada de la Virgen Open | D26 |
| Apr 2002 | Peter Heine Nielsen | 2,642 | WICC qual Moscow 25'+10 | C02 |
| Aug 2020 | Anton Demchenko | 2,641 | 48th World Open | D02 |
| Dec 2002 | Sergei Tiviakov | 2,631 | Los Inmortales Open 4th | C54 |
| Jan 2002 | Pavel V. Tregubov | 2,626 | Corus B | D21 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| Titled Tuesday | 2024 | 179 | 82 | 2,183 |
| Hoogeveen Essent Open | 2005 | 45 | 27 | 2,480 |
| Corus C | 2007 | 39 | 16.5 | 2,395 |
| Dieren Open | 2005 | 35 | 21 | 2,429 |
| Lost Boys Open | 2002 | 33 | 17 | 2,370 |
| Soest Open | 2001 | 32 | 22.5 | 2,422 |
| Groningen Open | 1999 | 28 | 11.5 | 2,301 |
| Corus B | 2003 | 24 | 11 | 2,499 |
Frequent opponents
Head-to-head records: Friso Nijboer (10 games) · Dennis De Vreugt (10 games) · Erik Van den Doel (10 games)
Interactive opening tree from all 1,766 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Harmen Jonkman's chess games?
1,766 games by Harmen Jonkman, from Apr 2003 to Sep 2026, are free to browse and replay move by move — no signup needed. The preparation view groups them into an opening tree showing every line Harmen Jonkman has played.
What does Harmen Jonkman play on the first move as White?
Across 904 games with White in our database, Harmen Jonkman opens with 1.e4 (93% of games), 1.d4 (7% of games), 1.Nf3 (0% of games). Against 1.e4 as Black, Harmen Jonkman answers 1...e5 (97% of games), 1...e6 (2% of games), 1...Nf6 (0% of games). Against 1.d4: 1...d5 (89% of games), 1...Nf6 (7% of games), 1...e6 (3% of games).
What openings does Harmen Jonkman play as White?
As White, Harmen Jonkman's most-played openings in our database are: Sicilian: Alapin (282 games, 46.5% win rate); French: Advance Variation (135 games, 54.1% win rate); King's Gambit (66 games, 50.0% win rate). The full breakdown of 904 games with White is in the table above.
What openings does Harmen Jonkman play as Black?
As Black, Harmen Jonkman most often plays: Queen's Gambit Accepted (143 games, 51.7% win rate); Ruy Lopez: Berlin Defense (103 games, 33.0% win rate); Queen's Pawn Game (65 games, 41.5% win rate). See the table above for the top ten Black openings across 862 games.
What is Harmen Jonkman's FIDE rating?
Harmen Jonkman is currently rated 2,289 in classical chess, 2,351 in rapid and 2,368 in blitz. Peak classical rating: 2,470 (Jan 2006).
How many games has Harmen Jonkman played?
Our database contains 1,766 games by Harmen Jonkman, covering Apr 2003 to Sep 2026. Overall record: 785 wins, 410 draws, 571 losses (44.5% win rate).
How do I prepare against Harmen Jonkman?
1,766 games by Harmen Jonkman reveal their opening repertoire, most-played lines, and the variations where they score worst — the raw material for targeted preparation. The interactive opening tree lets you walk every line to any depth.