| Jun 30, 2026 | Piasetski | 0–1 | Umetsubo | X Caioba - STD | Queen's Indian Defense: Spassky System | |
| Jun 27, 2026 | Hoffman | 1–0 | Piasetski | X Caioba RPD | Yusupov-Rubinstein System | |
| Jun 27, 2026 | Piasetski | ½–½ | Umetsubo | X Caioba RPD | Zukertort Opening | |
| Jun 27, 2026 | Oliveira | 0–1 | Piasetski | X Caioba - RPD | King's Indian Defense: Orthodox Variation | |
| Jun 27, 2026 | Piasetski | 0–1 | Krysa | X Caioba RPD | English Opening: King's English Variation, Kramnik-Shirov Counterattack | |
| Jun 27, 2026 | Piasetski | ½–½ | Perdomo | X Caioba RPD | King's Indian Defense: Fianchetto Variation, Classical Fianchetto | |
| Apr 5, 2026 | Reinoso Andre | 0–1 | Piasetski | Round 9: Reinoso Andre, Lazaro Javier - Piasetski, Leon | Sicilian Defense | |
| Apr 4, 2026 | Piasetski | 0–1 | Garcia Padron | Round 8: Piasetski, Leon - Garcia Padron, Jose | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Apr 3, 2026 | Piasetski | 1–0 | Perez Garcia | Round 7: Piasetski, Leon - Perez Garcia, Jimena | English Opening: Agincourt Defense, Wimpy System | |
| Apr 2, 2026 | Yao | 1–0 | Piasetski | Round 6: Yao, Lan - Piasetski, Leon | French Defense: Advance Variation, Euwe Variation | |
| Apr 1, 2026 | Piasetski | 1–0 | Garcia Blanco | Round 5: Piasetski, Leon - Garcia Blanco, Omar | English Opening: Symmetrical Variation, Ultra-Symmetrical Variation | |
| Mar 31, 2026 | Perez Rosales | 0–1 | Piasetski | Round 4: Perez Rosales, Pedro - Piasetski, Leon | King's Indian Attack: Spassky Variation | |
| Mar 30, 2026 | Piasetski | 0–1 | Barski | Round 3: Piasetski, Leon - Barski, Radoslaw | English Opening: King's English Variation, Reversed Closed Sicilian | |
| Mar 29, 2026 | Lopez de Turiso Sanchez | 0–1 | Piasetski | Round 2: Lopez de Turiso Sanchez, Jose Angel - Piasetski, Leon | Nimzo-Indian Defense: Leningrad Variation | |
| Mar 28, 2026 | Piasetski | 1–0 | Rodriguez Garcia | Round 1: Piasetski, Leon - Rodriguez Garcia, Joel 1998 | English Opening: Symmetrical Variation | |
| Feb 6, 2026 | Piasetski | 0–1 | Villegas | Round 8: Piasetski, Leon - Villegas, Franco | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Feb 5, 2026 | Sanhueza | ½–½ | Piasetski | Round 7: Sanhueza, Cristian - Piasetski, Leon | Caro-Kann Defense: Exchange Variation | |
| Feb 4, 2026 | Piasetski | 1–0 | Rodi | Round 6: Piasetski, Leon - Rodi, Luis Ernesto | English Opening: King's English Variation, Two Knights Variation | |
| Feb 3, 2026 | Lanzilotta | ½–½ | Piasetski | Round 5: Lanzilotta, Filippo - Piasetski, Leon | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Jan 31, 2026 | Piasetski | 0–1 | Vazquez | Round 2: Piasetski, Leon - Vazquez, Facundo | Bogo-Indian Defense: Retreat Variation | |
| Mar 22, 2025 | Hungaski | 1–0 | Piasetski | Round 6: Hungaski, Robert - Piasetski, Leon | Clemenz Opening | |
| Mar 22, 2025 | Piasetski | 0–1 | Flores | Round 5: Piasetski, Leon - Flores, Diego | English Opening: Symmetrical Variation | |
| Mar 22, 2025 | Egger | ½–½ | Piasetski | Round 4: Egger, Jorge - Piasetski, Leon | Pirc Defense: Austrian Attack, Weiss Variation | |
| Mar 22, 2025 | Piasetski | ½–½ | Hoffman | Round 3: Piasetski, Leon - Hoffman, Alejandro | Catalan Opening: Closed | |
| Mar 21, 2025 | Piasetski | 0–1 | Oro | Round 3: Piasetski, Leon - Oro, Faustino | Catalan Opening: Closed | |
| Dec 29, 2024 | Vasic | 1–0 | Piasetski | 15th Annual Calgary International | Old Indian Defense: Normal Variation | |
| Dec 28, 2024 | Piasetski | 1–0 | Michalchuk | 15th Annual Calgary International | English Opening: Anglo-Indian Defense, Anti-Anti-Grünfeld | |
| Dec 28, 2024 | Arruebarrena Rodriguez | ½–½ | Piasetski | 15th Annual Calgary International | Modern Defense: Standard Defense | |
| Dec 27, 2024 | Piasetski | 0–1 | Georgiev | 15th Annual Calgary International | English Opening: King's English Variation, Four Knights Variation, Flexible Line | |
| Dec 27, 2024 | Piasetski | 0–1 | Darvekar | 15th Annual Calgary International | English Opening: Caro-Kann Defensive System | |
| Dec 26, 2024 | Alpuri | ½–½ | Piasetski | 15th Annual Calgary International | Modern Defense: Standard Defense | |
| Nov 26, 2024 | Piasetski | 0–1 | Sturua | World Senior Chess Championship 2024 | Semi-Slav Defense: Chigorin Defense | |
| Nov 25, 2024 | Vatter | ½–½ | Piasetski | World Senior Chess Championship 2024 | Modern Defense | |
| Nov 24, 2024 | Piasetski | ½–½ | Chapman | World Senior Chess Championship 2024 | English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defense | |
| Nov 22, 2024 | Hugentobler | ½–½ | Piasetski | World Senior Chess Championship 2024 | Czech Defense | |
| Nov 20, 2024 | Ftacnik | 1–0 | Piasetski | World Senior Chess Championship 2024 | Bogo-Indian Defense: Grünfeld Variation | |
| Nov 19, 2024 | Piasetski | ½–½ | Legky | World Senior Chess Championship 2024 | English Opening: Agincourt Defense | |
| May 27, 2024 | Piasetski | 1–0 | Shivakumar | Round 8: Piasetski, Leon - Shivakumar, Shawnak | Zukertort Opening | |
| May 26, 2024 | Jiang | ½–½ | Piasetski | Round 7: Jiang, Lucas - Piasetski, Leon | French Defense: Rubinstein Variation, Blackburne Defense | |
| May 25, 2024 | Piasetski | 1–0 | Xia | Round 5: Piasetski, Leon - Xia, Joshua | Neo-Grünfeld Defense: Ultra-Delayed Exchange Variation | |
| May 24, 2024 | Ganesan | ½–½ | Piasetski | Round 3: Ganesan, Vikrant - Piasetski, Leon | English Opening: Symmetrical Variation, Botvinnik System | |
| May 24, 2024 | Piasetski | ½–½ | Talwalkar | Round 2: Piasetski, Leon - Talwalkar, Vedant | King's Indian Attack: Sicilian Variation | |
| May 24, 2024 | Haldorsen | 1–0 | Piasetski | Round 1: Haldorsen, Benjamin - Piasetski, Leon | French Defense: Rubinstein Variation, Blackburne Defense | |
| Apr 28, 2024 | Piasetski | 0–1 | Levin | Sardinia Worldchess | Zukertort Opening | |
| Apr 16, 2024 | Piasetski | 1–0 | Wang | Round 9: Piasetski, Leon - Wang, Minqing | English Opening: Agincourt Defense, Wimpy System | |
| Apr 15, 2024 | Mannion | ½–½ | Piasetski | Round 8: Mannion, Stephen R - Piasetski, Leon | Pirc Defense: Austrian Attack, Weiss Variation | |
| Apr 13, 2024 | Audi Ameya | ½–½ | Piasetski | Round 7: Audi Ameya - Piasetski, Leon | Pirc Defense: 150 Attack | |
| Apr 12, 2024 | Piasetski | * | Costa | Round 5: Piasetski, Leon - Costa, Gil | ? | |
| Apr 11, 2024 | Goncalves | 1–0 | Piasetski | Round 4: Goncalves, Samuel Jesus P - Piasetski, Leon | Sicilian Defense: Alapin Variation, Stoltz Attack | |
| Apr 10, 2024 | Piasetski | * | Pedro Cruz Maciel | Round 3: Piasetski, Leon - Pedro Cruz Maciel | ? | |
| Apr 10, 2024 | Shyaamnikhil P | 1–0 | Piasetski | Round 2: Shyaamnikhil P - Piasetski, Leon | Czech Defense | |
| Apr 9, 2024 | Piasetski | * | Carmo | Round 1: Piasetski, Leon - Carmo, Paulo | ? | |
| Apr 1, 2024 | Piasetski | 0–1 | Dukic | Round 8: Piasetski, Leon vs Dukic, Zachary | ? | |
| Apr 1, 2024 | Piasetski | 1–0 | Jaferian | zonal games: Chapter 14 | English Opening: Symmetrical Variation, Rubinstein Variation | |
| Mar 31, 2024 | Liu | 0–1 | Piasetski | Round 6: Liu, Henry vs Piasetski, Leon | Rapport-Jobava System | |
| Mar 30, 2024 | Kot | ½–½ | Piasetski | Round 5: Kot, Emanuel vs Leon Piatsetski | Sicilian Defense: Kan Variation, Polugaevsky Variation | |
| Mar 30, 2024 | Piasetski | 1–0 | Taylor | Round 4: Kang, Dorian vs Nicula, Marius | Zukertort Opening | |
| Mar 29, 2024 | Huang | 1–0 | Piasetski | 2024 Canadian Championship at Hart House, Toronto | Bogo-Indian Defense: Grünfeld Variation | |
| Mar 27, 2024 | Piasetski | ½–½ | Sambuev | Round 1: Piasetski, Leon - Sambuev, Bator | Queen's Gambit Declined: Ragozin Defense | |
| Dec 28, 2024 | Arruebarrena Rodriguez | ½–½ | Piasetski | Round 4: Arruebarrena Rodriguez, Rafael - Piasetski, Leon | Modern Defense: Standard Defense | |
| Oct 24, 2024 | Piasetski | 0–1 | Sorin | Round 6: Piasetski, Leon - Sorin, Ariel | King's Indian Defense: Petrosian Variation, Stein Defense | |
| Oct 20, 2024 | Piasetski | 0–1 | Tristan | Round 2: Piasetski, Leon - Tristan, Leonardo | English Opening: Agincourt Defense | |
| Sep 3, 2024 | Piasetski | ½–½ | Zuluaga Mancilla | Round 9: Piasetski, Leon - Zuluaga Mancilla, Cesar | Queen's Pawn Game: Zukertort Variation | |
| Sep 3, 2024 | Wu | 0–1 | Piasetski | Round 8: Wu, Derek - Piasetski, Leon | French Defense: Advance Variation, Euwe Variation | |
| Sep 2, 2024 | Piasetski | 1–0 | Biyiasas | Round 7: Piasetski, Leon - Biyiasas, Theodore | English Opening: Caro-Kann Defensive System | |
| Sep 2, 2024 | Karthi | ½–½ | Piasetski | Round 6: Karthi, Jashith - Piasetski, Leon | Nimzo-Indian Defense: Kmoch Variation | |
| Sep 1, 2024 | Piasetski | ½–½ | Tang | Round 5: Piasetski, Leon - Tang, Dylan | English Opening: Agincourt Defense | |
| Sep 1, 2024 | Guo | ½–½ | Piasetski | Round 4: Guo, Ethan - Piasetski, Leon | French Defense: Rubinstein Variation, Blackburne Defense | |
| Aug 31, 2024 | Piasetski | ½–½ | Bhatta | Round 3: Piasetski, Leon - Bhatta, Rohit | Queen's Pawn Game: Symmetrical Variation | |
| Aug 31, 2024 | Garduno Huerta | ½–½ | Piasetski | Round 2: Garduno Huerta, Joshua Emiliano - Piasetski, Leon | Bogo-Indian Defense: Nimzowitsch Variation | |
| Aug 30, 2024 | Piasetski | 0–1 | Cordova | Round 1: Piasetski, Leon - Cordova, Emilio | English Opening: King's English Variation | |
| Oct 26, 2023 | Piasetski | * | Blomstrom | 65+ World Senior Championship | ? | |
| Oct 25, 2023 | Guglielmi | * | Piasetski | 65+ World Senior Championship | ? | |
| Jun 18, 2023 | Roubalik | 1–0 | Piasetski | Teplice 2023 | Queen's Indian Defense: Petrosian Variation | |
| Jun 17, 2023 | Piasetski | ½–½ | Trost | Teplice 2023 | Queen's Gambit Declined: Three Knights Variation | |
| Jun 14, 2023 | Rasik | ½–½ | Piasetski | Teplice 2023 | Czech Defense | |
| Jun 13, 2023 | Gedajlovic | ½–½ | Piasetski | Teplice 2023 | Czech Defense | |
| Jun 11, 2023 | Sahidi | 1–0 | Piasetski | Teplice 2023 | Czech Defense | |
| Feb 11, 2023 | Salguero | 0–1 | Piasetski | VI Abierto de Montevideo | Nimzo-Indian Defense: Normal Variation | |
| Feb 10, 2023 | Piasetski | ½–½ | Esteve | VI Abierto de Montevideo | Queen's Gambit Declined: Harrwitz Attack, Fianchetto Defense | |
| Feb 9, 2023 | Vazquez | 1–0 | Piasetski | VI Abierto de Montevideo | Rapport-Jobava System | |
| Feb 9, 2023 | Vazquez | * | Piasetski | VI Abierto de Montevideo | Rapport-Jobava System | |
| Feb 8, 2023 | Piasetski | ½–½ | Matsuura | VI Abierto de Montevideo | Zukertort Opening | |
| Feb 7, 2023 | Piasetski | 1–0 | Durante | VI Abierto de Montevideo | Semi-Slav Defense: Chigorin Defense | |
| Feb 7, 2023 | Hoffman | ½–½ | Piasetski | VI Abierto de Montevideo | Queen's Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation | |
| Feb 5, 2023 | Rosa | 0–1 | Piasetski | VI Abierto de Montevideo | Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation | |
| Feb 4, 2023 | Piasetski | ½–½ | Moccero | VI Abierto de Montevideo | English Opening: Agincourt Defense, Catalan Defense | |
| Feb 3, 2023 | Rodriguez Martinez | 0–1 | Piasetski | VI Abierto de Montevideo | Czech Defense | |
| Dec 14, 2022 | Piasetski | 1–0 | Menna Barreto | Duchamp Open | Zukertort Opening: Kingside Fianchetto | |
| Dec 12, 2022 | Piasetski | 1–0 | Von Buelow | Duchamp Open | English Opening: Symmetrical Variation, Anti-Benoni Variation | |
| Dec 11, 2022 | Limp | ½–½ | Piasetski | Duchamp Open | Indian Defense: Knights Variation | |
| Dec 8, 2022 | Kim | ½–½ | Piasetski | Duchamp Open | ? | |
| Dec 7, 2022 | Piasetski | 1–0 | Maia | Duchamp Open | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Gurgenidze Variation | |