Prepare against Oystein Boyum Fossum
FM · Norway · World #3,756 classical · FIDE ID 1503430
When preparing against Oystein Boyum Fossum, expect 1.c4 in 44% of White games. Against 1.e4 the reply is 1...c5 (52% of games); against 1.d4, 1...f5 (30%). Lowest win rate among frequent openings: Dutch Defense as Black, 27.8% over 18 games.
Our database contains 276 games by Oystein Boyum Fossum, covering Apr 2003 to Aug 2026. Below you'll find Oystein Boyum Fossum's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Oystein Boyum Fossum 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 | 2,310 | 2,329 | Nov 2025 |
| Rapid | 2,199 | 2,199 | Aug 2026 |
| Blitz | 2,239 | 2,286 | Apr 2016 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 276 | 108 | 79 | 89 | 39.1% |
| As White | 139 | 53 | 41 | 45 | 38.1% |
| As Black | 137 | 55 | 38 | 44 | 40.1% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Oystein Boyum Fossum's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Oystein Boyum Fossum's side.
First moves as White (139 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| c4 | 61 | 43.9% | 54.1% |
| Nf3 | 45 | 32.4% | 52.2% |
| e4 | 26 | 18.7% | 57.7% |
| b3 | 4 | 2.9% | 12.5% |
| d4 | 3 | 2.2% | 50.0% |
Main lines as White
- 1.c4 — 44% of White games, 54.1% score
- …Nf6 (34% of these games) — Fossum usually continues g3 (50.0% score)
- …e5 (20% of these games) — Fossum usually continues g3 (58.3% score)
- …c5 (10% of these games) — Fossum usually continues g3 (30.0% score)
- 1.Nf3 — 32% of White games, 52.2% score
- …d5 (38% of these games) — Fossum usually continues c4 (61.1% score)
- …Nf6 (27% of these games) — Fossum usually continues c4 (57.1% score)
- …c5 (16% of these games) — Fossum usually continues g3 (25.0% score)
As Black against 1.e4 (62 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| c5 | 32 | 51.6% | 53.1% |
| e6 | 26 | 41.9% | 50.0% |
| e5 | 2 | 3.2% | 50.0% |
| Nf6 | 1 | 1.6% | 0.0% |
| c6 | 1 | 1.6% | 0.0% |
As Black against 1.d4 (50 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| f5 | 15 | 30.0% | 46.7% |
| e6 | 14 | 28.0% | 64.3% |
| d5 | 10 | 20.0% | 70.0% |
| Nf6 | 10 | 20.0% | 45.0% |
| c5 | 1 | 2.0% | 50.0% |
Oystein Boyum Fossum's chess games
All 276 games by Oystein Boyum Fossum in the Chess.ceo database (Apr 2003 - Aug 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: 108 wins, 79 draws, 89 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| A36 | English Opening | 28 | 13/9/6 | 46.4% |
| A09 | Réti Opening | 21 | 8/9/4 | 38.1% |
| A20 | English Opening: Reverse Sicilian | 13 | 5/5/3 | 38.5% |
| A36 | English Opening: Symmetrical | 10 | 2/1/7 | 20.0% |
| A10 | Modern Defense | 8 | 3/1/4 | 37.5% |
| A13 | English Opening: Neo-Catalan | 7 | 2/3/2 | 28.6% |
| A10 | English Opening: Dutch Defense | 6 | 4/0/2 | 66.7% |
| A11 | English Opening: Slav Setup | 5 | 1/1/3 | 20.0% |
| A01 | Nimzovich-Larsen attack | 4 | 0/1/3 | 0.0% |
| C42 | Petrov's Defense | 4 | 3/0/1 | 75.0% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| B27 | Sicilian: Hyperaccelerated Dragon | 19 | 7/4/8 | 36.8% |
| A90 | Dutch Defense | 18 | 5/7/6 | 27.8% |
| C06 | French: Tarrasch Variation | 11 | 3/4/4 | 27.3% |
| C14 | French: Classical Variation | 11 | 4/2/5 | 36.4% |
| A90 | Horwitz Defense | 6 | 4/1/1 | 66.7% |
| A20 | English Opening: Reverse Sicilian | 6 | 5/1/0 | 83.3% |
| B41 | Sicilian | 6 | 3/1/2 | 50.0% |
| A34 | English Opening: Symmetrical | 5 | 2/2/1 | 40.0% |
| A32 | Benoni Defense | 5 | 1/3/1 | 20.0% |
| D30 | Queen's Gambit Declined | 4 | 2/1/1 | 50.0% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Jan 2018 | Kjetil A. Lie | 2,537 | ch-NOR Blitz | A80 |
| Jan 2018 | Torbjorn Ringdal Hansen | 2,410 | ch-NOR Blitz | B27 |
| Jul 2015 | Vasiliy Korchmar | 2,406 | 8th Paleochora Open | D78 |
| Feb 2019 | Nicolai Getz | 2,398 | Kragero Open | A32 |
| Sep 2003 | Colm Daly | 2,355 | 12th Monarch Assurance | B80 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| Gibraltar Masters | 2005 | 20 | 9 | 2,281 |
| chB-NOR | 2006 | 12 | 9 | 2,160 |
| Troll Masters | 2003 | 10 | 5 | 2,252 |
| 27th Arco Open | 2005 | 9 | 6 | 2,323 |
| Gausdal Byggern Masters | 2005 | 9 | 4 | 2,042 |
| 15th Kiel Open | 2002 | 9 | 5.5 | 2,288 |
| Bergen Sommer Open | 2002 | 9 | 3.5 | 2,031 |
| 12th Monarch Assurance | 2003 | 9 | 4 | 2,230 |
Interactive opening tree from all 276 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Oystein Boyum Fossum's chess games?
276 games by Oystein Boyum Fossum, from Apr 2003 to Aug 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 Oystein Boyum Fossum has played.
What does Oystein Boyum Fossum play on the first move as White?
Across 139 games with White in our database, Oystein Boyum Fossum opens with 1.c4 (44% of games), 1.Nf3 (32% of games), 1.e4 (19% of games). Against 1.e4 as Black, Oystein Boyum Fossum answers 1...c5 (52% of games), 1...e6 (42% of games), 1...e5 (3% of games). Against 1.d4: 1...f5 (30% of games), 1...e6 (28% of games), 1...d5 (20% of games).
What openings does Oystein Boyum Fossum play as White?
As White, Oystein Boyum Fossum's most-played openings in our database are: English Opening (28 games, 46.4% win rate); Réti Opening (21 games, 38.1% win rate); English Opening: Reverse Sicilian (13 games, 38.5% win rate). The full breakdown of 139 games with White is in the table above.
What openings does Oystein Boyum Fossum play as Black?
As Black, Oystein Boyum Fossum most often plays: Sicilian: Hyperaccelerated Dragon (19 games, 36.8% win rate); Dutch Defense (18 games, 27.8% win rate); French: Tarrasch Variation (11 games, 27.3% win rate). See the table above for the top ten Black openings across 137 games.
What is Oystein Boyum Fossum's FIDE rating?
Oystein Boyum Fossum is currently rated 2,310 in classical chess, 2,199 in rapid and 2,239 in blitz. Peak classical rating: 2,329 (Nov 2025).
How many games has Oystein Boyum Fossum played?
Our database contains 276 games by Oystein Boyum Fossum, covering Apr 2003 to Aug 2026. Overall record: 108 wins, 79 draws, 89 losses (39.1% win rate).
How do I prepare against Oystein Boyum Fossum?
276 games by Oystein Boyum Fossum 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.