Male
FIDE ID:
Marcin Sieciechowicz
Last tournaments played
| Tournament | Date | Elo Avg. | Country |
| 24th Spilimbergo Open | 08/08/2026 | 2351 |  Italy |
| 26th ch-EUR Indiv 2026 | 04/07/2026 | 2229 |  Poland |
| 24th ch-EUR Indiv 2024 | 11/08/2024 | 2395 |  Montenegro |
| Bydgoszcz Open A 2024 | 08/26/2024 | 2240 | Poland |
Most Played Openings as White
| ECO | Opening | Games |
| E46 | Nimzo-Indian, 4.e3 O-O | 11 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 |
Most Played Openings as Black
| 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 |
