| Apr 5, 2026 | Agama Hernandez | 0–1 | Otero Acosta | Round 9: Agama Hernandez, Luis Fernando - Otero Acosta, Diasmany | Sicilian Defense: Kan Variation, Wing Attack | |
| Apr 4, 2026 | Otero Acosta | 0–1 | Cortes Rodriguez | Round 8: Otero Acosta, Diasmany - Cortes Rodriguez, Marco Octavio Johnatan | King's Indian Defense: Normal Variation, Rare Defenses | |
| Apr 4, 2026 | Perez Rodriguez | 1–0 | Otero Acosta | Round 7: Perez Rodriguez, Cesar Alejandro - Otero Acosta, Diasmany | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Apr 3, 2026 | Otero Acosta | ½–½ | Hernandez Guerrero | Round 6: Otero Acosta, Diasmany - Hernandez Guerrero, Gilberto | Bogo-Indian Defense: Nimzowitsch Variation | |
| Apr 3, 2026 | Martinez Duany | ½–½ | Otero Acosta | Round 5: Martinez Duany, Lelys Stanley - Otero Acosta, Diasmany | King's Indian Attack: Yugoslav Variation | |
| Apr 2, 2026 | Otero Acosta | ½–½ | Obregon Rivero | Round 4: Otero Acosta, Diasmany - Obregon Rivero, Juan Carlos | Queen's Pawn Game: Modern Defense | |
| Apr 2, 2026 | Espinosa Miranda | 0–1 | Otero Acosta | Round 3: Espinosa Miranda, Carlo Guillermo - Otero Acosta, Diasmany | Sicilian Defense: Grand Prix Attack | |
| Apr 2, 2026 | Otero Acosta | ½–½ | Galaviz Medina | Round 2: Otero Acosta, Diasmany - Galaviz Medina, Sion Radamantys | Queen's Gambit Declined: Ragozin Defense | |
| Jan 14, 2026 | Savchenko | 1–0 | Otero Acosta | Sakthi Group 44 IM Norm | Sicilian Defense: Kan Variation, Modern Variation | |
| Jan 13, 2026 | Otero Acosta | 0–1 | Kalyani Sirin | Sakthi Group 44 IM Norm | Queen's Gambit Declined: Westphalian Variation | |
| Jan 12, 2026 | Madhvendra Pratap Sharma | 1–0 | Otero Acosta | Sakthi Group 44 IM Norm | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jan 11, 2026 | Otero Acosta | ½–½ | Sarwat | Sakthi Group 44 IM Norm | Queen's Gambit Accepted: Winawer Defense | |
| Jan 11, 2026 | Vignesh B | 1–0 | Otero Acosta | Sakthi Group 44 IM Norm | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| Jan 10, 2026 | Otero Acosta | ½–½ | Nguyen Van Huy | Sakthi Group 44 IM Norm | Queen's Gambit Declined: Ragozin Defense | |
| Jan 10, 2026 | Siddhanth Poonja | 0–1 | Otero Acosta | Sakthi Group 44 IM Norm | Dutch Defense: Leningrad Variation, Matulovic Variation | |
| Jan 9, 2026 | Otero Acosta | 1–0 | Singgih | Sakthi Group 44 IM Norm | Queen's Gambit Declined: Modern Variation, Normal Line | |
| Jan 9, 2026 | Otero Acosta | 0–1 | Nivedita V C | Sakthi Group 44 IM Norm | King's Indian Defense: Normal Variation, Rare Defenses | |
| Dec 25, 2025 | Matta | 1–0 | Otero Acosta | Athens of the East 5th International Grandmaster Open Chess Tournament | Sicilian Defense: Kan Variation, Polugaevsky Variation | |
| Dec 22, 2025 | Otero Acosta | ½–½ | Palencia Morales | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Ruy Lopez: Closed, Trajkovic Counterattack | |
| Dec 20, 2025 | Oblitas | ½–½ | Otero Acosta | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Queen's Pawn Game: Accelerated London System | |
| Dec 19, 2025 | Otero Acosta | * | Claverie | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | ? | |
| Dec 19, 2025 | Otero Acosta | 1–0 | Claverie | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Dutch Defense | |
| Dec 19, 2025 | Gomez Sanchez | ½–½ | Otero Acosta | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Ruy Lopez: Closed, Yates Variation | |
| Dec 18, 2025 | Nithin Babu | 0–1 | Otero Acosta | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Dec 18, 2025 | Otero Acosta | 1–0 | Balasubramaniam H | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Benoni Defense: Classical Variation | |
| Dec 18, 2025 | Velavaa Ragavesh | 0–1 | Otero Acosta | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Sicilian Defense: French Variation | |
| Dec 17, 2025 | Otero Acosta | 1–0 | Jai Sankar Subramanian | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Grünfeld Defense: Exchange Variation, Modern Exchange Variation | |
| Dec 16, 2025 | Siddhanth Poonja | ½–½ | Otero Acosta | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | English Opening: Agincourt Defense | |
| Dec 9, 2025 | Gomez Sanchez | ½–½ | Otero Acosta | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | Ruy Lopez: Closed, Flohr System | |
| Dec 9, 2025 | Otero Acosta | ½–½ | Samyak Dharewa | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | Bogo-Indian Defense: Nimzowitsch Variation | |
| Dec 9, 2025 | Palencia Morales | ½–½ | Otero Acosta | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | Bogo-Indian Defense: Retreat Variation | |
| Dec 9, 2025 | Otero Acosta | 1–0 | Claverie | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | Dutch Defense: Raphael Variation | |
| Dec 9, 2025 | Hari Ganesh T | ½–½ | Otero Acosta | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | Sicilian Defense: O'Kelly Variation, Maróczy Bind, Paulsen Line | |
| Dec 9, 2025 | Otero Acosta | ½–½ | Nandish V S | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | Catalan Opening: Closed | |
| Dec 9, 2025 | Oblitas | ½–½ | Otero Acosta | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | Catalan Opening: Closed | |
| Dec 9, 2025 | Otero Acosta | 1–0 | Mukund Hemant Agarwal | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | Queen's Gambit Declined: Tartakower Defense | |
| Dec 9, 2025 | Kumaresh A | 1–0 | Otero Acosta | Sakthi Group 39th Tamil Nadu IM Norm Closed Circuit Chess Tournament 2025 - Coimbatore | French Defense: Winawer Variation, Portisch-Hook Variation | |
| Dec 6, 2025 | Otero Acosta | ½–½ | Aadik Theophane Lenin | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | King's Indian Defense: Normal Variation, Rare Defenses | |
| Dec 5, 2025 | Podolchenko | ½–½ | Otero Acosta | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | Catalan Opening: Closed | |
| Dec 4, 2025 | Otero Acosta | 1–0 | Nandish V S | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | Catalan Opening: Closed | |
| Dec 3, 2025 | Gireman | ½–½ | Otero Acosta | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | Rapport-Jobava System | |
| Dec 3, 2025 | Otero Acosta | 1–0 | Claverie | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | Indian Defense: Wade-Tartakower Defense | |
| Dec 1, 2025 | Palencia Morales | 0–1 | Otero Acosta | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | Sicilian Defense: Alapin Variation | |
| Dec 1, 2025 | Otero Acosta | 1–0 | Oblitas | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | Benko Gambit: Nd2 Variation | |
| Nov 30, 2025 | Ankit Ray | 0–1 | Otero Acosta | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | King's Indian Attack: Yugoslav Variation | |
| Nov 30, 2025 | Ashwin Sairam | 1–0 | Otero Acosta | Sakthi Groups 38th Tamilnadu IM NORM CLOSED CIRCUIT CHESS TOURNAMENT | Sicilian Defense: Smith-Morra Gambit Accepted | |
| Nov 20, 2025 | Otero Acosta | 0–1 | Vivaan Vishal Shah | 36TH_IM_NORM_TMT | Slav Defense: Quiet Variation, Schallopp Defense | |
| Nov 19, 2025 | Oblitas | ½–½ | Otero Acosta | 36TH_IM_NORM_TMT | Sicilian Defense: O'Kelly Variation, Maróczy Bind, Paulsen Line | |
| Nov 18, 2025 | Otero Acosta | 1–0 | Claverie | 36TH_IM_NORM_TMT | Dutch Defense: Staunton Gambit | |
| Nov 17, 2025 | Kumaresh A | ½–½ | Otero Acosta | 36TH_IM_NORM_TMT | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Nov 17, 2025 | Otero Acosta | ½–½ | Hari Ganesh T | 36TH_IM_NORM_TMT | Queen's Gambit Declined: Vienna Variation, Quiet Variation | |
| Nov 15, 2025 | Gireman | ½–½ | Otero Acosta | 36TH_IM_NORM_TMT | Rapport-Jobava System | |
| Nov 15, 2025 | Otero Acosta | 1–0 | Jaiveer Mahendru | 36TH_IM_NORM_TMT | Queen's Gambit Accepted: Normal Variation, Traditional System | |
| Nov 14, 2025 | Podolchenko | ½–½ | Otero Acosta | 36TH_IM_NORM_TMT | Catalan Opening: Closed | |
| Nov 14, 2025 | Palencia Morales | 0–1 | Otero Acosta | 36TH_IM_NORM_TMT | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Gurgenidze Variation | |
| Nov 12, 2025 | Mukund Hemant Agarwal | 1–0 | Otero Acosta | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Semi-Slav Defense: Stoltz Variation | |
| Nov 11, 2025 | Otero Acosta | 1–0 | Potawad Anirudhha | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Semi-Slav Defense: Stoltz Variation | |
| Nov 10, 2025 | Barath Kalyan M | ½–½ | Otero Acosta | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Nimzo-Larsen Attack: Modern Variation | |
| Nov 9, 2025 | Otero Acosta | 1–0 | Claverie | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Queen's Pawn Game | |
| Nov 8, 2025 | Gomez Sanchez | 1–0 | Otero Acosta | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Sicilian Defense: Keres Variation | |
| Nov 7, 2025 | Otero Acosta | 1–0 | Hemanth Raam | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Tarrasch Defense: Dubov Tarrasch | |
| Nov 7, 2025 | Palencia Morales | 1–0 | Otero Acosta | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Sicilian Defense: Alapin Variation, Barmen Defense | |
| Nov 6, 2025 | Otero Acosta | ½–½ | Oblitas | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Queen's Gambit Accepted: Janowski-Larsen Variation | |
| Nov 4, 2025 | Otero Acosta | ½–½ | Apoorv Kamble | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Queen's Indian Defense: Spassky System | |
| Nov 3, 2025 | Vignesh B | 0–1 | Otero Acosta | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Zukertort Opening | |
| Nov 2, 2025 | Otero Acosta | 1–0 | Oblitas | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Slav Defense: Quiet Variation, Pin Defense | |
| Nov 1, 2025 | Gomez Sanchez | ½–½ | Otero Acosta | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Ruy Lopez: Closed, Flohr System | |
| Nov 1, 2025 | Dinesh Rajan M | 0–1 | Otero Acosta | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Italian Game: Scotch Invitation Declined | |
| Oct 31, 2025 | Otero Acosta | 1–0 | Palencia Morales | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Queen's Gambit Accepted: Normal Variation, Traditional System | |
| Oct 30, 2025 | Claverie | ½–½ | Otero Acosta | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Dutch Defense: Stonewall Variation, Modern Variation | |
| Oct 30, 2025 | Otero Acosta | 0–1 | Raghav V | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Grünfeld Defense: Exchange Variation, Modern Exchange Variation | |
| Oct 29, 2025 | Pranav K P | ½–½ | Otero Acosta | Sakthi Group 34th Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Nimzo-Indian Defense: St. Petersburg Variation | |
| Oct 18, 2025 | Oblitas | ½–½ | Otero Acosta | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | English Opening: Symmetrical Variation, Full Symmetry Line | |
| Oct 17, 2025 | Otero Acosta | ½–½ | Claverie | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Petrov's Defense: Cozio Attack | |
| Oct 16, 2025 | Palencia Morales | ½–½ | Otero Acosta | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Pirc Defense: Austrian Attack, Dragon Formation | |
| Oct 16, 2025 | Otero Acosta | 0–1 | Siddhanth Poonja | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Nimzo-Indian Defense: Sämisch Variation | |
| Oct 15, 2025 | Aakash G | 1–0 | Otero Acosta | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Pseudo Queen's Indian Defense | |
| Oct 14, 2025 | Otero Acosta | 1–0 | Mrithyunjay Mahadevan | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Queen's Gambit Accepted: Furman Variation | |
| Oct 14, 2025 | Jinan Jomon | 1–0 | Otero Acosta | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Sicilian Defense: Accelerated Dragon, Maróczy Bind, Gurgenidze Variation | |
| Oct 13, 2025 | Otero Acosta | ½–½ | Ashwin Sairam | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Queen's Gambit Declined: Exchange Variation, Sämisch Variation | |
| Oct 10, 2025 | Otero Acosta | 1–0 | Sanjay Narayanan P S | Sakthi Group 35th Tamil Nadu IM Norm Closed Circuit Tournament – Chennai | Queen's Gambit Declined | |
| Oct 10, 2025 | Otero Acosta | 0–1 | Podolchenko | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Nimzo-Indian Defense: Kmoch Variation | |
| Dec 18, 2024 | Otero Acosta | ½–½ | Obregon Rivero | Ronda 9: Otero Acosta, Diasmany - Obregon Rivero, Juan Carlos | Queen's Gambit Declined: Tartakower Defense | |
| Dec 17, 2024 | Garcia de Dios | ½–½ | Otero Acosta | Ronda 8: Garcia de Dios, Jose Antonio - Otero Acosta, Diasmany | Benoni Defense: Fianchetto Variation | |
| Dec 17, 2024 | Otero Acosta | ½–½ | Ostrovskiy | Ronda 7: Otero Acosta, Diasmany - Ostrovskiy, Aleksandr | Queen's Gambit Declined | |
| Dec 16, 2024 | Orta Ruz | ½–½ | Otero Acosta | Ronda 6: Orta Ruz, Andre Fernando - Otero Acosta, Diasmany | Nimzo-Indian Defense: Normal Variation | |
| Dec 16, 2024 | Otero Acosta | 1–0 | Pagan | Ronda 5: Otero Acosta, Diasmany - Pagan, Jonathan | Bogo-Indian Defense: Nimzowitsch Variation | |
| Dec 15, 2024 | Martinez Duany | 1–0 | Otero Acosta | Ronda 4: Martinez Duany, Lelys Stanley - Otero Acosta, Diasmany | Sicilian Defense: Kan Variation, Wing Attack | |
| Dec 14, 2024 | Otero Acosta | 0–1 | Albornoz Cabrera | Ronda 3: Otero Acosta, Diasmany - Albornoz Cabrera, Carlos Daniel | Queen's Gambit Declined: Ragozin Defense, Alekhine Variation | |
| Dec 14, 2024 | Diaz Perez | 0–1 | Otero Acosta | Ronda 2: Diaz Perez, Michel Alejandro - Otero Acosta, Diasmany | Semi-Slav Defense: Normal Variation | |
| Dec 13, 2024 | Otero Acosta | 1–0 | Ramirez Tapia | Ronda 1: Otero Acosta, Diasmany - Ramirez Tapia, Jonathan Ed | Semi-Slav Defense | |
| Dec 1, 2024 | Silva Martinez Del Canizo | 0–1 | Otero Acosta | Ronda 5: Silva Martinez Del Canizo, Sebastian - Otero Acosta, Diasmany | Sicilian Defense: Taimanov Variation, Bastrikov Variation, English Attack | |
| Dec 1, 2024 | Otero Acosta | 1–0 | Galaviz Medina | Ronda 4: Otero Acosta, Diasmany - Galaviz Medina, Caissa Liduvina | English Opening: Agincourt Defense | |
| Oct 21, 2024 | Salazar Reyes | 1–0 | Otero Acosta | Ronda 3: Salazar Reyes, Diego - Otero Acosta, Diasmany | Sicilian Defense: Dragon Variation, Yugoslav Attack, Early Deviations | |
| Oct 21, 2024 | Otero Acosta | 1–0 | Lopez Fuentes | Ronda 2: Otero Acosta, Diasmany - Lopez Fuentes, Wilberth Sebastian | Dutch Defense: Leningrad Variation, Carlsbad Variation | |
| Oct 21, 2024 | Martinez Rodriguez | 0–1 | Otero Acosta | Ronda 1: Martinez Rodriguez, Jimmy - Otero Acosta, Diasmany | Sicilian Defense: Smith-Morra Gambit Accepted, Paulsen Formation | |
| Aug 10, 2024 | Luna Javier | ½–½ | Otero Acosta | Ronda 8: Luna Javier, Edgar Froylan - Otero Acosta, Diasmany | Benoni Defense: Benoni-Indian Defense, Kingside Move Order | |
| Aug 9, 2024 | Garcia de Dios | 1–0 | Otero Acosta | Ronda 6: Garcia de Dios, Jose Antonio - Otero Acosta, Diasmany | Benoni Defense: King's Indian System | |
| Aug 9, 2024 | Otero Acosta | ½–½ | Linares Napoles | Ronda 5: Otero Acosta, Diasmany - Linares Napoles, Oleiny | King's Indian Defense: Normal Variation, Rare Defenses | |
| Mar 31, 2024 | Otero Acosta | ½–½ | Martinez Alcantara | Round 9: Otero Acosta, Diasmany - Martinez Alcantara, Jose Eduardo | Ruy Lopez: Berlin Defense, Rio Gambit Accepted | |