8 games · 2015–2025 · 8 classical · 0 online
Sieber 33 draws2 Heinemann
56.3% for Sieber
Openings between them
| A17 | English Opening: Anglo-Indian Defense | 1 | 0.0% |
| A21 | English Opening: King's English Variation, Kramnik-Shirov Counterattack | 1 | 100.0% |
| A29 | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | 1 | 0.0% |
| B52 | Sicilian Defense: Moscow Variation, Sokolsky Variation | 1 | 50.0% |
| B67 | Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation | 1 | 50.0% |
| B90 | Sicilian Defense: Najdorf Variation, English Attack | 1 | 100.0% |
| C55 | Italian Game: Two Knights Defense, Modern Bishop's Opening | 1 | 100.0% |
| C67 | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | 1 | 50.0% |
All games
| Heinemann, Josefine2321 | 0-1 | Sieber, Fiona2232 | ch-GER Women 2025 | 2025 |
| Heinemann, Josefine2360 | 1-0 | Sieber, Fiona2274 | German Masters Women 2023 | 2023 |
| Heinemann, Josefine2296 | ½-½ | Sieber, Fiona2275 | DSB Women Squad Challenge | 2021 |
| Heinemann, Josefine2281 | 0-1 | Sieber, Fiona2201 | German Masters Women 2020 | 2020 |
| Heinemann, Josefine2227 | ½-½ | Sieber, Fiona2250 | German Masters Women 2019 | 2019 |
| Heinemann, Josefine2261 | 1-0 | Sieber, Fiona2290 | 3rd German Women Masters | 2018 |
| Sieber, Fiona2287 | 1-0 | Heinemann, Josefine2294 | Erfurt Young Masters | 2017 |
| Heinemann, Josefine2244 | ½-½ | Sieber, Fiona2167 | Fraubundesliga 2015-16 | 2015 |