| Nov 23, 2025 | Schaefer | 1–0 | Steiner | Round 9: Schaefer, Marlon - Steiner, Matias | Sicilian Defense: Alapin Variation | |
| Nov 23, 2025 | Steiner | 1–0 | Kurley | Round 8: Steiner, Matias - Kurley, Roman | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Nov 23, 2025 | Kanzow | 1–0 | Steiner | Round 7: Kanzow, Alexander - Steiner, Matias | King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System | |
| Nov 23, 2025 | Steiner | 1–0 | Trosin | Round 6: Steiner, Matias - Trosin, Moritz | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Nov 23, 2025 | Greiner | 0–1 | Steiner | Round 5: Greiner, Gregory - Steiner, Matias | King's Indian Defense: Exchange Variation | |
| Nov 23, 2025 | Steiner | 1–0 | Hoesel | Round 4: Steiner, Matias - Hoesel, Lucas | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Nov 23, 2025 | Manucharyan | 1–0 | Steiner | Round 3: Manucharyan, Andriy - Steiner, Matias | King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Rare Line | |
| Nov 23, 2025 | Steiner | 1–0 | Duong | Round 2: Steiner, Matias - Duong, Michelle | Latvian Gambit | |
| Nov 23, 2025 | Dobrikov | 1–0 | Steiner | Round 1: Dobrikov, Marco - Steiner, Matias | Sicilian Defense: Najdorf Variation, Adams Attack | |
| Nov 22, 2025 | Steiner | 1–0 | Berghold | Round 9: Steiner, Matias - Berghold, Lotta | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Nov 22, 2025 | Quante | 1–0 | Steiner | Round 8: Quante, Lennart - Steiner, Matias | Zukertort Opening: Quiet System | |
| Nov 22, 2025 | Zhang | 0–1 | Steiner | Round 7: Zhang, Taihao - Steiner, Matias | Sicilian Defense: Najdorf Variation | |
| Nov 22, 2025 | Steiner | 1–0 | Bashirov | Round 6: Steiner, Matias - Bashirov, Mahammad | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Nov 22, 2025 | Schlereth | 1–0 | Steiner | Round 5: Schlereth, Maximilian - Steiner, Matias | King's Indian Defense: Fianchetto Variation, Yugoslav System | |
| Nov 22, 2025 | Steiner | 1–0 | Becker | Round 4: Steiner, Matias - Becker, Justus | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Nov 22, 2025 | Frenz | 0–1 | Steiner | Round 3: Frenz, Niclas - Steiner, Matias | Sicilian Defense: Najdorf Variation | |
| Nov 22, 2025 | Steiner | 0–1 | Broghammer | Round 2: Steiner, Matias - Broghammer, Luca Francesco | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Nov 22, 2025 | Schlueter | 1–0 | Steiner | Round 1: Schlueter, Johan - Steiner, Matias | Sicilian Defense: Najdorf Variation | |
| May 18, 2024 | Steiner | 0–1 | Kulik | Round 3: Steiner, Matias - Kulik, Nicolas | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Feb 12, 2024 | Matias Steiner | 0–1 | Diego Carbone | Uruguay Chess Championship - Semifinal 2024 | Sicilian Defense: Alapin Variation | |
| Feb 10, 2023 | Ressia | 1–0 | Steiner | VI Abierto de Montevideo | Trompowsky Attack | |
| Feb 9, 2023 | Steiner | 0–1 | Izquierdo | VI Abierto de Montevideo | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Feb 8, 2023 | Bonjorn | 0–1 | Steiner | VI Abierto de Montevideo | King's Indian Defense: Fianchetto Variation, Yugoslav Variation | |
| Feb 7, 2023 | Steiner | 0–1 | Mafra | VI Abierto de Montevideo | Caro-Kann Defense: Advance Variation, Botvinnik-Carls Defense | |
| Feb 7, 2023 | Curi | ½–½ | Steiner | VI Abierto de Montevideo | King's Indian Defense: Sämisch Variation, Sämisch Gambit | |
| Feb 3, 2023 | Steiner | 0–1 | Lopez Azambuja | VI Abierto de Montevideo | Italian Game: Classical Variation, Giuoco Pianissimo, with d6 | |
