Prepare against Jessica Harmsen
WIM · NLD · World #22,549 classical · FIDE ID 1001612
When preparing against Jessica Harmsen, expect 1.e4 in 72% of White games. Against 1.e4 the reply is 1...e6 (97% of games); against 1.d4, 1...f5 (70%). Lowest win rate among frequent openings: Dutch Defense as Black, 29.2% over 24 games.
Our database contains 146 games by Jessica Harmsen, covering Apr 2003 to Jul 2026. Below you'll find Jessica Harmsen's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Jessica Harmsen 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 | 2,036 | 2,185 | Apr 2004 |
| Blitz | 2,027 | 2,056 | Sep 2025 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 146 | 55 | 36 | 55 | 37.7% |
| As White | 69 | 25 | 17 | 27 | 36.2% |
| As Black | 77 | 30 | 19 | 28 | 39.0% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Jessica Harmsen's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Jessica Harmsen's side.
First moves as White (69 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| e4 | 50 | 72.5% | 51.0% |
| f4 | 15 | 21.7% | 53.3% |
| e3 | 3 | 4.3% | 0.0% |
| h3 | 1 | 1.4% | 0.0% |
Main lines as White
- 1.e4 — 72% of White games, 51.0% score
- …c5 (38% of these games) — Harmsen usually continues Nc3 (61.1% score)
- …e5 (22% of these games) — Harmsen usually continues Nf3 (50.0% score)
- …e6 (16% of these games) — Harmsen usually continues d3 (60.0% score)
- 1.f4 — 22% of White games, 53.3% score
- …d5 (67% of these games) — Harmsen usually continues Nf3 (71.4% score)
- …e5 (13% of these games) — Harmsen usually continues fxe5 (25.0% score)
- …Nf6 (13% of these games) — Harmsen usually continues b3 (100.0% score)
As Black against 1.e4 (39 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| e6 | 38 | 97.4% | 52.6% |
| c5 | 1 | 2.6% | 0.0% |
As Black against 1.d4 (23 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| f5 | 16 | 69.6% | 40.6% |
| e6 | 6 | 26.1% | 83.3% |
Jessica Harmsen's chess games
All 146 games by Jessica Harmsen in the Chess.ceo database (Apr 2003 - Jul 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: 55 wins, 36 draws, 55 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| A03 | Bird's opening | 15 | 7/2/6 | 46.7% |
| B26 | Sicilian | 10 | 3/3/4 | 30.0% |
| B26 | Sicilian: Closed | 9 | 3/5/1 | 33.3% |
| C48 | Four Knights Game: Spanish Variation | 6 | 4/1/1 | 66.7% |
| C00 | King's Indian Attack | 5 | 2/2/1 | 40.0% |
| B08 | Pirc Defense | 4 | 1/1/2 | 25.0% |
| A00 | Van 't Kruijs Opening | 3 | 0/0/3 | 0.0% |
| B15 | Modern Defense | 2 | 1/0/1 | 50.0% |
| B13 | Caro-Kann: Exchange Variation | 2 | 1/1/0 | 50.0% |
| B10 | Caro-Kann | 2 | 0/1/1 | 0.0% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| A80 | Dutch Defense | 24 | 7/6/11 | 29.2% |
| C16 | French: Winawer Variation | 16 | 6/6/4 | 37.5% |
| C06 | French: Tarrasch Variation | 9 | 2/3/4 | 22.2% |
| C02 | French: Advance Variation | 8 | 5/1/2 | 62.5% |
| C00 | French Defense | 5 | 2/1/2 | 40.0% |
| A25 | English Opening: Dutch Defense | 4 | 2/1/1 | 50.0% |
| A08 | King's Indian Attack | 2 | 1/0/1 | 50.0% |
| C01 | French: Exchange Variation | 2 | 1/1/0 | 50.0% |
| B24 | Sicilian: Closed | 1 | 0/0/1 | 0.0% |
| A40 | English Defense | 1 | 1/0/0 | 100.0% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Nov 1988 | Margarita Voiska | 2,350 | Olympiad Women-28 | A08 |
| Jan 1992 | Vesna Misanovic | 2,320 | Bled Open w | C48 |
| Nov 1988 | Margareta Juncu | 2,245 | Olympiad Women-28 | A87 |
| Aug 2000 | Linda Jap Tjoen San | 2,210 | ch-NED w | C02 |
| Nov 1988 | Bagyashree Sathe Thipsay | 2,175 | Olympiad Women-28 | A03 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| ch-NED w | 2025 | 34 | 19.5 | 2,211 |
| The Hague AEGON | 1995 | 17 | 8 | – |
| ch-NED qual w | 1999 | 12 | 8 | 2,239 |
| Naleczow w | 1986 | 12 | 5 | 1,968 |
| EU-ch U20 Girls | 1985 | 12 | 6.5 | 2,065 |
| Olympiad Women-28 | 1988 | 11 | 6 | 2,305 |
| 24th ch-EU w | 2024 | 10 | 4 | 1,911 |
| Oisterwijk zt w | 1991 | 9 | 5.5 | 2,238 |
Interactive opening tree from all 146 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Jessica Harmsen's chess games?
146 games by Jessica Harmsen, from Apr 2003 to Jul 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 Jessica Harmsen has played.
What does Jessica Harmsen play on the first move as White?
Across 69 games with White in our database, Jessica Harmsen opens with 1.e4 (72% of games), 1.f4 (22% of games), 1.e3 (4% of games). Against 1.e4 as Black, Jessica Harmsen answers 1...e6 (97% of games), 1...c5 (3% of games). Against 1.d4: 1...f5 (70% of games), 1...e6 (26% of games).
What openings does Jessica Harmsen play as White?
As White, Jessica Harmsen's most-played openings in our database are: Bird's opening (15 games, 46.7% win rate); Sicilian (10 games, 30.0% win rate); Sicilian: Closed (9 games, 33.3% win rate). The full breakdown of 69 games with White is in the table above.
What openings does Jessica Harmsen play as Black?
As Black, Jessica Harmsen most often plays: Dutch Defense (24 games, 29.2% win rate); French: Winawer Variation (16 games, 37.5% win rate); French: Tarrasch Variation (9 games, 22.2% win rate). See the table above for the top ten Black openings across 77 games.
What is Jessica Harmsen's FIDE rating?
Jessica Harmsen is currently rated 2,036 in classical chess and 2,027 in blitz. Peak classical rating: 2,185 (Apr 2004).
How many games has Jessica Harmsen played?
Our database contains 146 games by Jessica Harmsen, covering Apr 2003 to Jul 2026. Overall record: 55 wins, 36 draws, 55 losses (37.7% win rate).
How do I prepare against Jessica Harmsen?
146 games by Jessica Harmsen 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.