| Apr 20, 2026 | Hessmann | * | Piekarski | Curitiba Chess Open 2026 - Blitz | Caro-Kann Defense: Breyer Variation | |
| Apr 20, 2026 | Piekarski | * | Conor | Curitiba Chess Open 2026 - Blitz | Trompowsky Attack | |
| Apr 20, 2026 | Hoffman | 1–0 | Piekarski | Rodada 7: Hoffman, Alejandro - Piekarski, Atila Balzer | Queen's Gambit Accepted: Classical Defense, Main Line | |
| Apr 20, 2026 | Piekarski | 1–0 | Gomes | Curitiba Chess Open 2026 - Blitz | Queen's Pawn Game: Levitsky Attack | |
| Apr 20, 2026 | Piekarski | * | Da Silva | Curitiba Chess Open 2026 - Blitz | Queen's Pawn Game: Levitsky Attack | |
| Apr 20, 2026 | Piekarski | * | Ribeiro | Curitiba Chess Open 2026 - Blitz | Queen's Pawn Game | |
| Apr 20, 2026 | Lima | 0–1 | Piekarski | Curitiba Chess Open 2026 - Blitz | Queen's Gambit Accepted: Central Variation, McDonnell Defense | |
| Apr 20, 2026 | Piekarski | 0–1 | Cubas | Rodada 4: Piekarski, Atila Balzer - Cubas, Jose | Trompowsky Attack | |
| Apr 20, 2026 | Ferreira | 0–1 | Piekarski | Curitiba Chess Open 2026 - Blitz | English Opening: Caro-Kann Defensive System | |
| Apr 19, 2026 | Carneiro Da Fonseca | 1–0 | Piekarski | Curitiba Chess Open 2026 - Rápido | Pseudo Queen's Indian Defense | |
| Apr 19, 2026 | Mourao | * | Piekarski | Curitiba Chess Open 2026 - Pensado | Nimzo-Indian Defense: Romanishin Variation | |
| Apr 19, 2026 | Piekarski | * | Filadelfo Nunes | Curitiba Chess Open 2026 - Rápido | Ruy Lopez: Morphy Defense, Steinitz Deferred | |
| Apr 19, 2026 | Agustinho Da Silva | 0–1 | Piekarski | Curitiba Chess Open 2026 - Rápido | Indian Defense: Normal Variation | |
| Apr 19, 2026 | Piekarski | 1–0 | Bispo | Curitiba Chess Open 2026 - Rápido | Sicilian Defense: Taimanov Variation | |
| Apr 19, 2026 | Gomes | 1–0 | Piekarski | Curitiba Chess Open 2026 - Rápido | Petrov's Defense: Three Knights Game | |
| Feb 1, 2025 | Piekarski | 0–1 | Contreras Huaman | II Sampa Chess Open - Rápido FIDE | Caro-Kann Defense: Exchange Variation, Rubinstein Variation | |
| Feb 1, 2025 | Piekarski | 1–0 | Sibinel | II Sampa Chess Open - Rápido FIDE | Sicilian Defense: Four Knights Variation, Exchange Variation | |
| Feb 1, 2025 | Piekarski | 0–1 | Campelo | II Sampa Chess Open - Rápido FIDE | ? | |
| Feb 1, 2025 | Nascimento | 0–1 | Piekarski | II Sampa Chess Open - Rápido FIDE | ? | |
| Feb 1, 2025 | Casalaspro | 1–0 | Piekarski | II Sampa Chess Open - Rápido FIDE | Petrov's Defense: Modern Attack | |
