Male
FIDE ID:
Marcin Sieciechowicz
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| 34th Cracovia Open A | 12/27/2023 | 2265 |  Poland |
| 2nd Bundesliga Nord 23-24 | 10/21/2023 | 2337 |  Germany |
| Bydgoszcz Open A 2024 | 08/26/2024 | 2240 | Poland |
| Krakow International 2024 | 06/22/2024 | 2317 | Poland |
Marcin Sieciechowicz Repertoire with White pieces (most played)
| ECO | Opening | Games |
| E46 | Nimzo-Indian, 4.e3 O-O | 10 games |
| D17 | Queen's Gambit Declined Slav, Czech defence | 10 games |
| D31 | Queen's Gambit Declined, 3.Nc3 | 9 games |
| E32 | Nimzo-Indian, classical variation | 8 games |
Marcin Sieciechowicz Repertoire with Black pieces (most played)
| ECO | Opening | Games |
| B90 | Sicilian, Najdorf | 12 games |
| C07 | French, Tarrasch, open variation | 11 games |
| A15 | English, 1...Nf6 (Anglo-Indian defense) | 10 games |
| B97 | Sicilian, Najdorf, 7...Qb6 | 9 games |
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