Prepare against Marek Kosiorek
FM · Poland · World #8,718 classical · FIDE ID 1110284
When preparing against Marek Kosiorek, expect 1.d4 in 50% of White games. Against 1.e4 the reply is 1...c5 (56% of games); against 1.d4, 1...Nf6 (72%). Lowest win rate among frequent openings: Indian Defense as Black, 19.2% over 26 games.
Our database contains 441 games by Marek Kosiorek, covering Apr 2003 to Jul 2026. Below you'll find Marek Kosiorek's most-played openings with White and Black, career performance record, notable wins and top events — everything you need to scout Marek Kosiorek 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 | 2,191 | 2,390 | Oct 2005 |
| Rapid | 2,255 | 2,379 | Nov 2013 |
| Blitz | 2,218 | 2,366 | Dec 2012 |
Performance record
| Split | Games | Wins | Draws | Losses | Win rate |
|---|---|---|---|---|---|
| Overall | 441 | 169 | 157 | 115 | 38.3% |
| As White | 216 | 92 | 77 | 47 | 42.6% |
| As Black | 225 | 77 | 80 | 68 | 34.2% |
Move-by-move preparation stats
Straight from the preparation tree built over all of Marek Kosiorek's games — the same tree the interactive prep board lets you walk to any depth. Scores are from Marek Kosiorek's side.
First moves as White (216 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| d4 | 108 | 50.0% | 59.7% |
| e4 | 74 | 34.3% | 60.8% |
| c4 | 25 | 11.6% | 60.0% |
| Nf3 | 9 | 4.2% | 66.7% |
Main lines as White
- 1.d4 — 50% of White games, 59.7% score
- …Nf6 (68% of these games) — Kosiorek usually continues c4 (61.7% score)
- …d5 (18% of these games) — Kosiorek usually continues c4 (66.7% score)
- …d6 (5% of these games) — Kosiorek usually continues e4 (62.5% score)
- 1.e4 — 34% of White games, 60.8% score
- …c5 (50% of these games) — Kosiorek usually continues Nf3 (50.0% score)
- …c6 (12% of these games) — Kosiorek usually continues d4 (75.0% score)
- …e5 (12% of these games) — Kosiorek usually continues Nf3 (62.5% score)
As Black against 1.e4 (117 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| c5 | 65 | 55.6% | 56.9% |
| e5 | 20 | 17.1% | 37.5% |
| c6 | 14 | 12.0% | 57.1% |
| Nf6 | 8 | 6.8% | 50.0% |
| g6 | 3 | 2.6% | 33.3% |
| d6 | 3 | 2.6% | 50.0% |
As Black against 1.d4 (71 games)
| Move | Games | Share | Player score |
|---|---|---|---|
| Nf6 | 51 | 71.8% | 51.0% |
| d5 | 15 | 21.1% | 50.0% |
| d6 | 2 | 2.8% | 50.0% |
| g6 | 2 | 2.8% | 50.0% |
| c5 | 1 | 1.4% | 0.0% |
Marek Kosiorek's chess games
All 441 games by Marek Kosiorek 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: 169 wins, 157 draws, 115 losses.
Openings as White
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| E97 | King's Indian Defense: Orthodox Variation | 17 | 6/7/4 | 35.3% |
| A46 | Indian Defense | 15 | 4/8/3 | 26.7% |
| B50 | Sicilian | 14 | 2/7/5 | 14.3% |
| A57 | Benoni Defense | 13 | 7/2/4 | 53.8% |
| D46 | Slav Defense | 12 | 7/4/1 | 58.3% |
| A15 | English Opening | 11 | 5/5/1 | 45.5% |
| E41 | Nimzo-Indian: Rubinstein System | 10 | 5/2/3 | 50.0% |
| A25 | English Opening: Reverse Sicilian | 8 | 5/2/1 | 62.5% |
| E70 | King's Indian Defense | 8 | 5/2/1 | 62.5% |
| B31 | Sicilian: Rossolimo | 7 | 2/3/2 | 28.6% |
Openings as Black
| ECO | Opening | Games | W/D/L | Win rate |
|---|---|---|---|---|
| D37 | Indian Defense | 26 | 5/9/12 | 19.2% |
| A08 | Sicilian | 22 | 11/11/0 | 50.0% |
| B80 | Sicilian: Scheveningen | 14 | 7/3/4 | 50.0% |
| C42 | Petrov's Defense | 10 | 2/4/4 | 20.0% |
| D85 | Grünfeld Defense | 10 | 5/4/1 | 50.0% |
| B85 | Sicilian: Najdorf | 8 | 3/3/2 | 37.5% |
| B48 | Sicilian: Taimanov | 7 | 0/2/5 | 0.0% |
| A13 | English Opening | 7 | 1/5/1 | 14.3% |
| B04 | Alekhine Defense | 7 | 3/2/2 | 42.9% |
| E94 | King's Indian Defense: Orthodox Variation | 6 | 3/2/1 | 50.0% |
Notable wins
| Date | Opponent | Elo | Event | ECO |
|---|---|---|---|---|
| Sep 2010 | Kamil Miton | 2,629 | chT-POL 66th | D40 |
| Dec 2012 | Kirill Stupak | 2,526 | ch-EU rapid | C04 |
| Mar 2013 | Marian Petrov | 2,508 | Dublin Easter e2e4 Open | A43 |
| Jan 1998 | Krystian Jedryczka | 2,465 | ch-POL sf | E97 |
| Sep 2007 | Krystian Kuzmicz | 2,418 | chT-POL 1 | B07 |
Top events
| Event | Year | Games | Score | TPR |
|---|---|---|---|---|
| POL-chT 2nd League | 2023 | 50 | 28.5 | 2,270 |
| POL-chT 1st League | 2024 | 27 | 9.5 | 2,130 |
| Polanica Zdroj Open | 2001 | 21 | 10.5 | 2,292 |
| ch-POL sf | 2000 | 20 | 12.5 | 2,366 |
| chT-POL 1 | 2014 | 18 | 8 | 2,377 |
| Karvina Open | 2016 | 18 | 11.5 | 2,296 |
| 75th Warsaw YMCA Spring-D | 2010 | 12 | 9.5 | 2,493 |
| 115th Warsaw YMCA Winter | 2013 | 11 | 4.5 | 2,231 |
Interactive opening tree from all 441 games, weak-spot detection and engine analysis.
Start preparationFrequently asked questions
Where can I find Marek Kosiorek's chess games?
441 games by Marek Kosiorek, 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 Marek Kosiorek has played.
What does Marek Kosiorek play on the first move as White?
Across 216 games with White in our database, Marek Kosiorek opens with 1.d4 (50% of games), 1.e4 (34% of games), 1.c4 (12% of games). Against 1.e4 as Black, Marek Kosiorek answers 1...c5 (56% of games), 1...e5 (17% of games), 1...c6 (12% of games). Against 1.d4: 1...Nf6 (72% of games), 1...d5 (21% of games), 1...d6 (3% of games).
What openings does Marek Kosiorek play as White?
As White, Marek Kosiorek's most-played openings in our database are: King's Indian Defense: Orthodox Variation (17 games, 35.3% win rate); Indian Defense (15 games, 26.7% win rate); Sicilian (14 games, 14.3% win rate). The full breakdown of 216 games with White is in the table above.
What openings does Marek Kosiorek play as Black?
As Black, Marek Kosiorek most often plays: Indian Defense (26 games, 19.2% win rate); Sicilian (22 games, 50.0% win rate); Sicilian: Scheveningen (14 games, 50.0% win rate). See the table above for the top ten Black openings across 225 games.
What is Marek Kosiorek's FIDE rating?
Marek Kosiorek is currently rated 2,191 in classical chess, 2,255 in rapid and 2,218 in blitz. Peak classical rating: 2,390 (Oct 2005).
How many games has Marek Kosiorek played?
Our database contains 441 games by Marek Kosiorek, covering Apr 2003 to Jul 2026. Overall record: 169 wins, 157 draws, 115 losses (38.3% win rate).
How do I prepare against Marek Kosiorek?
441 games by Marek Kosiorek 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.