| May 24, 2026 | Van der Werf | 0–1 | Slagboom | Tiebreak partij 4: Van der Werf, Mark - Slagboom, Leandro | Zukertort Opening | |
| May 24, 2026 | Slagboom | 1–0 | Van der Werf | Tiebreak partij 3: Slagboom, Leandro - Van der Werf, Mark | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| May 24, 2026 | Slagboom | 1–0 | Van der Werf | Tiebreak partij 2: Slagboom, Leandro - Van der Werf, Mark | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| May 24, 2026 | Van der Werf | 1–0 | Slagboom | Tiebreak partij 1: Van der Werf, Mark - Slagboom, Leandro | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| May 24, 2026 | Ootes | 0–1 | Slagboom | Round 12: Ootes, Lars - Slagboom, Leandro | English Opening: King's English Variation | |
| May 24, 2026 | Slagboom | ½–½ | De Boer | Round 11: Slagboom, Leandro - De Boer, Eelke | Sicilian Defense: Modern Variations | |
| May 24, 2026 | Jellema | 0–1 | Slagboom | Round 10: Jellema, Pieter - Slagboom, Leandro | Indian Defense: Accelerated London System | |
| May 24, 2026 | Aravindhan | 1–0 | Slagboom | Round 8: Aravindhan, Achyuth - Slagboom, Leandro | Four Knights Game | |
| May 24, 2026 | Slagboom | 0–1 | Den Hartog | Round 9: Slagboom, Leandro - Den Hartog, Marijn | French Defense: Rubinstein Variation, Kasparov Attack | |
| May 23, 2026 | Slagboom | ½–½ | Pel | Round 5: Slagboom, Leandro - Pel, Bonno | Pirc Defense: Classical Variation, Quiet System | |
| May 23, 2026 | Slagboom | 1–0 | Grochal | Round 7: Slagboom, Leandro - Grochal, Joey | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| May 23, 2026 | Bekker | 0–1 | Slagboom | Round 6: Bekker, Stefan - Slagboom, Leandro | Indian Defense: Wade-Tartakower Defense | |
| May 23, 2026 | Simenon | 0–1 | Slagboom | Round 4: Simenon, Jozef - Slagboom, Leandro | Nimzo-Larsen Attack: Modern Variation | |
| May 23, 2026 | Slagboom | 1–0 | Kamphuis | Round 3: Slagboom, Leandro - Kamphuis, Jasper | Ruy Lopez: Morphy Defense, Norwegian Variation | |
| May 23, 2026 | Terlouw | ½–½ | Slagboom | Round 2: Terlouw, Wouter - Slagboom, Leandro | Indian Defense: Wade-Tartakower Defense | |
| May 23, 2026 | Slagboom | ½–½ | Van der Werf | Round 1: Slagboom, Leandro - Van der Werf, Mark | Ruy Lopez: Closed, Anti-Marshall | |
| May 19, 2026 | Slagboom | 1–0 | Grooten | Round 13: Slagboom, Leandro - Grooten, Tommy | Sicilian Defense: Moscow Variation | |
| May 16, 2026 | Slagboom | 1–0 | Keuning | Round 5: Slagboom, Leandro - Keuning, Selwin | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| May 14, 2026 | Slagboom | 1–0 | Morsch | Round 1: Slagboom, Leandro - Morsch, Tjeerd | English Opening: Mikenas-Carls Variation | |
| May 13, 2026 | Slagboom | 0–1 | Van Foreest | Round 7: Slagboom, Leandro - Van Foreest, Nanne | Ruy Lopez: Open Berlin Defense, Showalter Variation | |
| May 13, 2026 | Botter | 0–1 | Slagboom | Round 6: Botter, Simon - Slagboom, Leandro | King's Indian Defense: Normal Variation, Rare Defenses | |
| May 13, 2026 | Mostertman | ½–½ | Slagboom | Round 4: Mostertman, Milan - Slagboom, Leandro | Italian Game: Giuoco Pianissimo, Normal | |
| May 13, 2026 | Slagboom | 1–0 | Bruggink | Round 3: Slagboom, Leandro - Bruggink, Tycho | Queen's Gambit Declined: Queen's Knight Variation | |
| May 13, 2026 | Kanters | 0–1 | Slagboom | Round 2: Kanters, Cor - Slagboom, Leandro | King's Indian Defense: Fianchetto Variation, Delayed Fianchetto | |
| Apr 11, 2026 | Slagboom | ½–½ | Tondivar | Round 9: Slagboom, Leandro - Tondivar, Babak | Petrov's Defense: Millennium Attack | |
| Mar 28, 2026 | Jens | 0–1 | Slagboom | Round 6: Jens, Jelmer - Slagboom, Leandro | Italian Game: Paris Defense | |
| Mar 7, 2026 | Kokje | 1–0 | Slagboom | Round 8: Kokje, Joris - Slagboom, Leandro | Benoni Defense: King's Pawn Line, with Nge2 | |
| Feb 7, 2026 | Slagboom | ½–½ | Lammens | Round 7: Slagboom, Leandro - Lammens, Tim | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Dec 26, 2025 | Vrolijk | 1–0 | Slagboom | Round 5: Vrolijk, Liam - Slagboom, Leandro | Neo-Grünfeld Defense: Classical Variation, Original Defense | |
| Nov 22, 2025 | Slagboom | ½–½ | Vandenbussche | Round 4: Slagboom, Leandro - Vandenbussche, Thibaut | Tarrasch Defense: Two Knights Variation | |
| Nov 7, 2025 | Van der Stricht | ½–½ | Slagboom | KNSB competitie 2025/2026 | Queen's Gambit Declined | |
| Oct 4, 2025 | Bijlsma | ½–½ | Slagboom | Round 2: Bijlsma, Nick - Slagboom, Leandro | King's Indian Defense: Normal Variation, King's Knight Variation | |
| May 13, 2025 | Lenaerts | ½–½ | Slagboom | KNSB Meesterklasse 2024-2025 | French Defense: Burn Variation | |
| Apr 5, 2025 | Slagboom | 0–1 | Tabak | Round 8: Slagboom, Leandro - Tabak, Stefan | Sicilian Defense: Closed, Anti-Sveshnikov Variation, with d6 | |
| Mar 8, 2025 | Slagboom | 1–0 | Van der Werf | Round 7: Slagboom, Leandro - Van der Werf, Mark | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Feb 2, 2025 | Smeets | 1–0 | Slagboom | Tata Steel Chess Qualifiers | French Defense: Winawer Variation, Portisch-Hook Variation | |
| Feb 1, 2025 | Slagboom | ½–½ | Lohia | Tata Steel Chess Qualifiers | English Opening: Anglo-Indian Defense, Flohr-Mikenas-Carls Variation, Nei Gambit | |
| Jan 31, 2025 | Sofronie | 0–1 | Slagboom | Tata Steel Chess Qualifiers | Indian Defense | |
| Jan 29, 2025 | Slagboom | 1–0 | Holzke | Tata Steel Chess Qualifiers | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Jan 28, 2025 | Zwirs | 0–1 | Slagboom | Tata Steel Chess Qualifiers | Queen's Pawn Game: Colle System | |
| Jan 27, 2025 | Slagboom | 1–0 | Grutter | Tata Steel Chess Qualifiers | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Jan 26, 2025 | Panesar Vedant | ½–½ | Slagboom | Tata Steel Chess Qualifiers | French Defense: Advance Variation, Euwe Variation | |
| Jan 25, 2025 | Slagboom | 0–1 | Tudor | Tata Steel Chess Qualifiers | Sicilian Defense: Najdorf Variation, Opocensky Variation | |
| Jan 24, 2025 | Beukema | ½–½ | Slagboom | Tata Steel Chess Qualifiers | French Defense: Burn Variation | |
| Feb 8, 2025 | Pham | 1–0 | Slagboom | Round 6: Pham, Khoi - Slagboom, Leandro | Benoni Defense | |
| Dec 14, 2024 | Slagboom | ½–½ | Baselmans | KNSB | English Opening: King's English Variation | |
| Nov 23, 2024 | Cardon | 0–1 | Slagboom | Meesterklasse 24-25 | King's Indian Defense: Normal Variation | |
| Sep 21, 2024 | Strating | ½–½ | Slagboom | KNSB Meesterklasse 2024-2025 | King's Indian Defense | |
| Aug 31, 2024 | Bermudez Ureba | 0–1 | Slagboom | EYCC 2024 - O18 | Ruy Lopez: Morphy Defense, Neo-Arkhangelsk Variation | |
| Aug 30, 2024 | Slagboom | ½–½ | Hak | EYCC 2024 - O18 | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Aug 29, 2024 | Sokolovsky | 1–0 | Slagboom | EYCC 2024 - O18 | French Defense: Alekhine-Chatard Attack, Albin-Chatard Gambit | |
| Aug 28, 2024 | Slagboom | 1–0 | Valiyev | EYCC 2024 - O18 | Sicilian Defense: Closed | |
| Aug 26, 2024 | Kasipour Azbari | 0–1 | Slagboom | EYCC 2024 - O18 | French Defense: Advance Variation, Paulsen Attack | |
| Aug 25, 2024 | Slagboom | ½–½ | Backiel | EYCC 2024 - O18 | English Opening: Agincourt Defense, Catalan Defense Accepted | |
| Aug 24, 2024 | Stalmach | 1–0 | Slagboom | EYCC 2024 - O18 | Benoni Defense: Knight's Tour Variation | |
| Aug 23, 2024 | Slagboom | 1–0 | Vilimek | EYCC 2024 - O18 | English Opening: Anglo-Indian Defense, Queen's Knight Variation | |
| Aug 22, 2024 | Sinitsyn | 0–1 | Slagboom | EYCC 2024 - O18 | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jul 29, 2024 | Ritzerveld | ½–½ | Slagboom | Round 6: Ritzerveld, Noah - Slagboom, Leandro | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jul 27, 2024 | Slagboom | ½–½ | De Boer | Round 5: Slagboom, Leandro - De Boer, Eelke | Petrov's Defense: Classical Attack, Staunton Variation | |
| Jul 26, 2024 | Buckels | ½–½ | Slagboom | Round 4: Buckels, Valentin - Slagboom, Leandro | Tarrasch Defense: Dubov Tarrasch | |
| Jul 25, 2024 | Slagboom | ½–½ | Leenhouts | Round 3: Slagboom, Leandro - Leenhouts, Koen | Nimzo-Indian Defense: Rubinstein System, Rubinstein Variation | |
| Jul 24, 2024 | Blok | 0–1 | Slagboom | Round 2: Blok, Xaveer - Slagboom, Leandro | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jul 23, 2024 | Slagboom | 1–0 | Zwirs | Round 1: Slagboom, Leandro - Zwirs, Jasper | Sicilian Defense: Moscow Variation | |
| Jul 9, 2024 | Warmerdam | 1–0 | Slagboom | Quarter-Finals | Game 2: Warmerdam, Max - Slagboom, Leandro | King's Indian Attack: Double Fianchetto | |
| Jul 8, 2024 | Slagboom | ½–½ | Warmerdam | Quarter-Finals | Game 1: Slagboom, Leandro - Warmerdam, Max | Sicilian Defense: Moscow Variation | |
| Jul 7, 2024 | Schoppen | ½–½ | Slagboom | Round of 16 | Game 2: Schoppen, Casper - Slagboom, Leandro | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jul 6, 2024 | Slagboom | 1–0 | Schoppen | Round of 16 | Game 1: Slagboom, Leandro - Schoppen, Casper | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jun 23, 2024 | Slagboom | ½–½ | Vrolijk | Round 6: Slagboom, Leandro - Vrolijk, Liam | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | |
| Jun 23, 2024 | Hommes | 0–1 | Slagboom | Round 5: Hommes, Elmar - Slagboom, Leandro | Queen's Gambit Declined: Ragozin Defense | |
| Jun 22, 2024 | Slagboom | 1–0 | Schilstra | Round 4: Slagboom, Leandro - Schilstra, Laurens | French Defense: Steinitz Variation, Boleslavsky Variation | |
| Jun 22, 2024 | Van Rootselaar | 1–0 | Slagboom | Round 3: Van Rootselaar, Rik - Slagboom, Leandro | Indian Defense: Anti-Nimzo-Indian | |
| Jun 21, 2024 | Slagboom | 1–0 | Kooiman | Round 2: Slagboom, Leandro - Kooiman, Tobi | Alekhine Defense: Four Pawns Attack, Main Line | |
| Jun 21, 2024 | Schoonackers | 0–1 | Slagboom | Round 1: Schoonackers, Jeroen - Slagboom, Leandro | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| May 3, 2024 | Slagboom | 1–0 | Bakija | Tiebreak round 3: Slagboom, Leandro - Bakija, Alan | Nimzo-Larsen Attack: Classical Variation | |
| May 3, 2024 | Slagboom | 1–0 | Bakija | Tiebreak round 2: Slagboom, Leandro - Bakija, Alan | Indian Defense: Wade-Tartakower Defense | |
| May 3, 2024 | Bakija | 1–0 | Slagboom | Tiebreak round 1: Bakija, Alan - Slagboom, Leandro | King's Indian Attack | |
| May 3, 2024 | Slagboom | 1–0 | Van Hesselingen | Round 7: Slagboom, Leandro - Van Hesselingen, Guido | Ruy Lopez: Closed, Chigorin Defense | |
| May 2, 2024 | Snijders | 0–1 | Slagboom | Round 6: Snijders, Take - Slagboom, Leandro | French Defense: Steinitz Variation, Boleslavsky Variation | |
| May 1, 2024 | Smid | ½–½ | Slagboom | Round 5: Smid, Jelle - Slagboom, Leandro | Four Knights Game: Scotch Variation Accepted | |
| Apr 30, 2024 | Slagboom | ½–½ | Bakija | Round 4: Slagboom, Leandro - Bakija, Alan | Pirc Defense | |
| Apr 29, 2024 | Labruyere | 0–1 | Slagboom | Round 3: Labruyere, Roger - Slagboom, Leandro | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Apr 28, 2024 | Slagboom | ½–½ | Moskalets | Round 2: Slagboom, Leandro - Moskalets, Sofiia | Tarrasch Defense | |
| Apr 27, 2024 | Blom | 0–1 | Slagboom | Round 1: Blom, Rens - Slagboom, Leandro | French Defense: Steiner Variation | |
| Dec 30, 2024 | Duijker | 0–1 | Slagboom | Round 9: Duijker, Rick - Slagboom, Leandro | King's Indian Defense: Orthodox Variation, Glek Defense | |
| Dec 29, 2024 | Slagboom | ½–½ | Ritzerveld | Round 8: Slagboom, Leandro - Ritzerveld, Noah | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | |
| Dec 28, 2024 | Cernov | 1–0 | Slagboom | Round 7: Cernov, Henrik - Slagboom, Leandro | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Dec 27, 2024 | Slagboom | ½–½ | Albers | Round 6: Slagboom, Leandro - Albers, Sasa | Hungarian Opening: Indian Defense | |
| Dec 26, 2024 | Laxman | ½–½ | Slagboom | Round 5: Laxman, R.R. - Slagboom, Leandro | Zukertort Opening | |
| Dec 24, 2024 | Slagboom | 0–1 | Schoppen | Round 4: Slagboom, Leandro - Schoppen, Casper | King's Indian Defense: Normal Variation, Standard Development | |
| Dec 23, 2024 | Van Roon | 0–1 | Slagboom | Round 3: Van Roon, Sjoerd - Slagboom, Leandro | French Defense: Winawer Variation, Advance Variation | |
| Dec 22, 2024 | Slagboom | 1–0 | Grooten | Round 2: Slagboom, Leandro - Grooten, Herman | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Dec 21, 2024 | Hummel | ½–½ | Slagboom | Round 1: Hummel, Paul - Slagboom, Leandro | King's Indian Defense: Normal Variation, King's Knight Variation | |
| Nov 9, 2024 | Slagboom | 1–0 | Ondersteijn | Round 3: Slagboom, Leandro - Ondersteijn, Niels | Nimzo-Indian Defense: Sämisch Variation | |
| Nov 2, 2024 | De Wit | 0–1 | Slagboom | Round 9: De Wit, Michel - Slagboom, Leandro | Ruy Lopez: Exchange, Alekhine Variation | |
| Nov 1, 2024 | Slagboom | 0–1 | Bosboom | Round 8: Slagboom, Leandro - Bosboom, Manuel | Modern Defense | |
| Oct 31, 2024 | Labruyere | ½–½ | Slagboom | Round 7: Labruyere, Roger - Slagboom, Leandro | French Defense: Tarrasch Variation, Open System, Euwe-Keres Line | |
| Oct 30, 2024 | Slagboom | 1–0 | Ten Dam | Round 6: Slagboom, Leandro - Ten Dam, Bram | Sicilian Defense: Moscow Variation, Main Line | |
| Oct 30, 2024 | Bakija | 0–1 | Slagboom | Round 5: Bakija, Alan - Slagboom, Leandro | King's Indian Defense: Normal Variation, King's Knight Variation | |
| Oct 28, 2024 | Slagboom | 0–1 | Sankalp Gupta | Round 3: Slagboom, Leandro - Sankalp Gupta | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Oct 27, 2024 | Boeren | 0–1 | Slagboom | Round 2: Boeren, Jurriaan - Slagboom, Leandro | Ruy Lopez: Morphy Defense, Classical Defense Deferred | |