Prepare against Ireneus Kostowski
DEU · World #54,590 classical · FIDE ID 4689615
When preparing against Ireneus Kostowski, expect 1.d4 in 100% of White games. Against 1.e4 the reply is 1...d5 (92% of games); against 1.d4, 1...Nf6 (60%).
Our database contains 45 games by Ireneus Kostowski, covering Apr 2003 to Aug 2026. Below you'll find Ireneus Kostowski's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Ireneus Kostowski 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 | 1,875 | 1,924 | Jul 2025 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 45 | 17 | 7 | 21 | 37.8% |
| As White | 23 | 8 | 4 | 11 | 34.8% |
| As Black | 22 | 9 | 3 | 10 | 40.9% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Ireneus Kostowski's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Ireneus Kostowski's side.
First moves as White (23 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d4 | 23 | 100.0% | 43.5% |
Main lines as White
- 1.d4 — 100% of White games, 43.5% score
- …Nf6 (52% of these games) — Kostowski usually continues c4 (41.7% score)
- …d5 (39% of these games) — Kostowski usually continues c4 (60.0% score)
- …f5 (9% of these games) — Kostowski usually continues c3 (50.0% score)
As Black against 1.e4 (13 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d5 | 12 | 92.3% | 58.3% |
| c5 | 1 | 7.7% | 50.0% |
As Black against 1.d4 (5 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| Nf6 | 3 | 60.0% | 33.3% |
| d5 | 2 | 40.0% | 0.0% |
Ireneus Kostowski's chess games
All 45 games by Ireneus Kostowski 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: 17 wins, 7 draws, 21 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| D00 | London System | 8 | 3/2/3 | 37.5% |
| A46 | Indian Defense | 4 | 1/0/3 | 25.0% |
| E80 | King's Indian: Sämisch | 3 | 1/1/1 | 33.3% |
| A80 | Dutch Defense | 2 | 0/1/1 | 0.0% |
| B08 | King's Indian Defense | 1 | 0/0/1 | 0.0% |
| A31 | English Opening | 1 | 0/0/1 | 0.0% |
| D07 | Queen's Gambit | 1 | 1/0/0 | 100.0% |
| D32 | Queen's Gambit Declined | 1 | 1/0/0 | 100.0% |
| D51 | Semi-Slav Defense | 1 | 0/0/1 | 0.0% |
| D93 | Slav Defense | 1 | 1/0/0 | 100.0% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| B01 | Scandinavian Defense: Main Line | 8 | 4/2/2 | 50.0% |
| B01 | Scandinavian Defense: Modern Variation | 3 | 2/0/1 | 66.7% |
| D11 | Slav Defense | 2 | 0/0/2 | 0.0% |
| A11 | English Opening: Slav Setup | 2 | 1/0/1 | 50.0% |
| A60 | Benoni Defense | 2 | 1/0/1 | 50.0% |
| A08 | Réti Opening | 1 | 1/0/0 | 100.0% |
| A31 | English Opening | 1 | 0/0/1 | 0.0% |
| D38 | Semi-Slav Defense | 1 | 0/0/1 | 0.0% |
| B22 | Sicilian: Alapin | 1 | 0/1/0 | 0.0% |
| A00 | Scandinavian Defense | 1 | 0/0/1 | 0.0% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Oct 2010 | Rolf Weber | 2,046 | 21st Goch Open | B01 |
| Aug 2025 | Grzegorz Komendecki | 1,832 | Rubinstein Mem Open B | D00 |
| Aug 2025 | Anna Hampel | 1,800 | Rubinstein Mem Open B | B01 |
| Aug 2025 | Karol Szwed | 1,798 | Rubinstein Mem Open B | A45 |
| Aug 2025 | Jan Bednarski | 1,787 | Rubinstein Mem Open B | B01 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| Rubinstein Mem Open B | 2025 | 9 | 4.5 | 1,795 |
| 20th Goch Open | 2009 | 7 | 3.5 | 1,769 |
| Rubinstein Chess Festival 2026 - Open C | 2026 | 7 | 3 | 1,654 |
| 18th Goch Open | 2007 | 7 | 3.5 | 1,676 |
| 21st Goch Open | 2010 | 7 | 3 | 1,911 |
| 14th Goch Open | 2003 | 7 | 3 | 1,931 |
| ch-GER Amateurs | 2024 | 1 | 0 | 1,475 |
Interactive opening tree from all 45 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Ireneus Kostowski's chess games?
45 games by Ireneus Kostowski, 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 Ireneus Kostowski has played.
What does Ireneus Kostowski play on the first move as White?
Across 23 games with White in our database, Ireneus Kostowski opens with 1.d4 (100% of games). Against 1.e4 as Black, Ireneus Kostowski answers 1...d5 (92% of games), 1...c5 (8% of games). Against 1.d4: 1...Nf6 (60% of games), 1...d5 (40% of games).
What openings does Ireneus Kostowski play as White?
As White, Ireneus Kostowski's most-played openings in our database are: London System (8 games, 37.5% win rate); Indian Defense (4 games, 25.0% win rate); King's Indian: Sämisch (3 games, 33.3% win rate). The full breakdown of 23 games with White is in the table above.
What openings does Ireneus Kostowski play as Black?
As Black, Ireneus Kostowski most often plays: Scandinavian Defense: Main Line (8 games, 50.0% win rate); Scandinavian Defense: Modern Variation (3 games, 66.7% win rate); Slav Defense (2 games, 0.0% win rate). See the table above for the top ten Black openings across 22 games.
What is Ireneus Kostowski's FIDE rating?
Ireneus Kostowski is currently rated 1,875 in classical chess. Peak classical rating: 1,924 (Jul 2025).
How many games has Ireneus Kostowski played?
Our database contains 45 games by Ireneus Kostowski, covering Apr 2003 to Aug 2026. Overall record: 17 wins, 7 draws, 21 losses (37.8% win rate).
How do I prepare against Ireneus Kostowski?
45 games by Ireneus Kostowski 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.