Mark Biernacki
USA · FIDE ID 2082322 · 18 tournament games since 2021
Standard
2039
#640 in USA (active)
Rapid
2013
#324 in USA (active)
Blitz
2029
#443 in USA (active)
Score
33%
5 W · 2 D · 11 L
Opp. avg
2240
Last 18 games
Last game
2026-08-14
Summer Prague Open 2026
Prep summary
- As White: 1.c4 in 100% of games (scores 40%).
- Against 1.e4: 1...c5 in 4 of 4 games (Sicilian Defense), scoring 25%.
- Against 1.d4: 1...Nf6 in 6 of 6 games (Indian Defense), scoring 25%.
Based on 18 over-the-board games (8 rapid · 2 blitz). 5 with White (40%), 13 with Black (31%).
Openings as White
First move
| 1.c4 | 5 | 40% |
Most played
| Opening | Games | Score |
|---|---|---|
| English Opening: King's English Variation | 1 | 100% |
| Queen's Gambit Declined: Barmen Variation | 1 | 0% |
| King's Indian Defense: Fianchetto Variation, Kavalek Defense | 1 | 100% |
| King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Advance Line | 1 | 0% |
| English Opening: Symmetrical Variation, Botvinnik System Reversed, with Nf3 | 1 | 0% |
Openings as Black
Against 1.e4 (4 games)
| 1...c5 Sicilian Defense | 4 | 25% |
Against 1.d4 (6 games)
| 1...Nf6 Indian Defense | 6 | 25% |
Most played
| Opening | Games | Score |
|---|---|---|
| Sicilian Defense: Kan Variation, Polugaevsky Variation | 1 | 0% |
| Sicilian Defense: Kan Variation, Wing Attack | 1 | 0% |
| King's Indian Defense: Normal Variation, Standard Development | 1 | 100% |
| English Opening: Anglo-Indian Defense, King's Indian Formation | 1 | 100% |
| Indian Defense: Accelerated London System | 1 | 0% |
Recent games
| Date | Opponent and event | Result |
|---|---|---|
| 2026-08-14 | Martin Simakhin (2058) Summer Prague Open 2026 · rapid | L |
| 2026-08-13 | William Gijsen (2163) Summer Prague Open 2026 · rapid | L |
| 2026-08-12 | Boris Pogorelskiy (2135) Summer Prague Open 2026 · rapid | W |
| 2026-08-09 | Felix Schletter (2137) Summer Prague Open 2026 · rapid | L |
| 2026-08-08 | Luca Rotolante (2089) Summer Prague Open 2026 · rapid | W |
| 2026-08-07 | Rudolf Jun (2345) Summer Prague Open 2026 · rapid | W |
| 2026-07-04 | Shah Sagar (2307) 2026 Naroditsky Memorial Rapid & Blitz | Blitz · blitz | W |
| 2026-07-04 | Eric Rosen (2327) 2026 Naroditsky Memorial Rapid & Blitz | Blitz · blitz | L |
| 2026-07-03 | John Bartholomew (2443) 2026 Naroditsky Memorial Rapid & Blitz | Rapid · rapid | L |
| 2026-07-03 | Daniel Rensch (2399) 2026 Naroditsky Memorial Rapid & Blitz | Rapid · rapid | L |
Data: FIDE rating list (October 2026 list; national ranks count active players) and tournament games broadcast on Lichess since 2020 (open data, CC0). Results are matched to FIDE players by name or FIDE ID and may be incomplete. This page shows public chess results only. Is this you and you want the page removed? Email chessmoose1@gmail.com and we remove it.