| Jun 26, 2026 | Kuandykuly | 1–0 | Siddhanth Poonja | Round 11: Kuandykuly, Danis - Siddhanth Poonja | Sicilian Defense: Kan Variation | |
| Jun 25, 2026 | Siddhanth Poonja | ½–½ | Ambartsumian | Round 10: Siddhanth Poonja - Ambartsumian, Tyhran | English Opening: Anglo-Indian Defense, King's Indian Formation | |
| Jun 24, 2026 | Le Geay | 0–1 | Siddhanth Poonja | Round 9: Le Geay, Joachim - Siddhanth Poonja | Sicilian Defense: Hyperaccelerated Dragon | |
| Jun 23, 2026 | Siddhanth Poonja | 1–0 | Abdsattar | Round 8: Siddhanth Poonja - Abdsattar, Alisher | King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System | |
| Jun 22, 2026 | Ten Dam | ½–½ | Siddhanth Poonja | Round 7: Ten Dam, Bram - Siddhanth Poonja | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Jun 20, 2026 | Siddhanth Poonja | 1–0 | Birmenko | Round 6: Siddhanth Poonja - Birmenko, Nikolay | Queen's Pawn Game: Symmetrical Variation, Pseudo-Catalan | |
| Jun 19, 2026 | Wites | ½–½ | Siddhanth Poonja | Round 5: Wites, Adam - Siddhanth Poonja | Sicilian Defense: French Variation | |
| Jun 18, 2026 | Siddhanth Poonja | ½–½ | Rajendran | Round 4: Siddhanth Poonja - Rajendran, Kartikeyan | King's Indian Defense: Fianchetto Variation, Yugoslav Variation, Exchange Line | |
| Jun 17, 2026 | Molchanov | 0–1 | Siddhanth Poonja | Round 3: Molchanov, Roman - Siddhanth Poonja | Sicilian Defense: French Variation | |
| Jun 15, 2026 | Macia Tell | 0–1 | Siddhanth Poonja | Round 1: Macia Tell, Dario - Siddhanth Poonja | Bogo-Indian Defense: Retreat Variation | |
| Jun 12, 2026 | Siddhanth Poonja | 0–1 | Smirnov | Round 2: Siddhanth Poonja - Smirnov, Mark | English Opening: Agincourt Defense, Bogoljubow Defense | |
| Apr 12, 2026 | Dau Khuong Duy | 1–0 | Siddhanth Poonja | new tournament description | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jan 14, 2026 | Siddhanth Poonja | ½–½ | Sarwat | Sakthi Group 44 IM Norm | English Opening: King's English Variation, Three Knights System | |
| Jan 13, 2026 | Vignesh B | ½–½ | Siddhanth Poonja | Sakthi Group 44 IM Norm | Sicilian Defense: Old Sicilian | |
| Jan 13, 2026 | Siddhanth Poonja | ½–½ | Nguyen Van Huy | Sakthi Group 44 IM Norm | English Opening: Agincourt Defense | |
| Jan 11, 2026 | Singgih | 0–1 | Siddhanth Poonja | Sakthi Group 44 IM Norm | Sicilian Defense: Old Sicilian | |
| Jan 11, 2026 | Siddhanth Poonja | 0–1 | Savchenko | Sakthi Group 44 IM Norm | English Opening: Agincourt Defense | |
| Jan 10, 2026 | Kalyani Sirin | ½–½ | Siddhanth Poonja | Sakthi Group 44 IM Norm | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Jan 10, 2026 | Siddhanth Poonja | 0–1 | Otero Acosta | Sakthi Group 44 IM Norm | Dutch Defense: Leningrad Variation, Matulovic Variation | |
| Jan 9, 2026 | Madhvendra Pratap Sharma | 1–0 | Siddhanth Poonja | Sakthi Group 44 IM Norm | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Jan 9, 2026 | Nivedita V C | 0–1 | Siddhanth Poonja | Sakthi Group 44 IM Norm | Zukertort Opening: Sicilian Invitation | |
| Dec 30, 2025 | Premshankar B U | 1–0 | Siddhanth Poonja | Athens of the East 5th International Grandmaster Open Chess Tournament | Queen's Pawn Game: London System | |
| Dec 27, 2025 | Prasannaa.s | 1–0 | Siddhanth Poonja | Athens of the East 5th International Grandmaster Open Chess Tournament | Sicilian Defense: Accelerated Dragon, Modern Bc4 Variation | |
| Dec 26, 2025 | Aarit Kapil | 1–0 | Siddhanth Poonja | Athens of the East 5th International Grandmaster Open Chess Tournament | Catalan Opening: Closed | |
| Dec 25, 2025 | Siddhanth Poonja | 1–0 | Andalamala Hemal Varshan | Athens of the East 5th International Grandmaster Open Chess Tournament | Catalan Opening: Open Defense, Classical Line | |
| Dec 22, 2025 | Oblitas | ½–½ | Siddhanth Poonja | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Dec 21, 2025 | Siddhanth Poonja | 0–1 | Claverie | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Dutch Defense: Classical Variation | |
| Dec 20, 2025 | Gomez Sanchez | 1–0 | Siddhanth Poonja | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Trompowsky Attack | |
| Dec 19, 2025 | Siddhanth Poonja | * | Balasubramaniam H | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | ? | |
| Dec 19, 2025 | Siddhanth Poonja | ½–½ | Balasubramaniam H | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | English Opening: King's English Variation, Three Knights System | |
| Dec 19, 2025 | Velavaa Ragavesh | 0–1 | Siddhanth Poonja | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Sicilian Defense: O'Kelly Variation, Venice System | |
| Dec 18, 2025 | Siddhanth Poonja | 1–0 | Jai Sankar Subramanian | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Queen's Gambit Declined: Austrian Attack, Salvio Countergambit | |
| Dec 18, 2025 | Siddhanth Poonja | 0–1 | Nithin Babu | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Dec 17, 2025 | Palencia Morales | 0–1 | Siddhanth Poonja | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Dec 16, 2025 | Siddhanth Poonja | ½–½ | Otero Acosta | Sakthi Group 40th TN IM Norm Closed Circuit Chess Tournament | English Opening: Agincourt Defense | |
| Nov 13, 2025 | Yeletsky | 1–0 | Siddhanth Poonja | Round 5: Yeletsky, Ivan - Siddhanth Poonja | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation | |
| Nov 12, 2025 | Makarian | 1–0 | Siddhanth Poonja | Round 3: Makarian, Rudik - Siddhanth Poonja | Zukertort Opening: Sicilian Invitation | |
| Nov 10, 2025 | Pranav Anand | 1–0 | Siddhanth Poonja | Round 1: Pranav Anand - Siddhanth Poonja | Bogo-Indian Defense: Retreat Variation | |
| Oct 19, 2025 | Aakash G | ½–½ | Siddhanth Poonja | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Rapport-Jobava System | |
| Oct 18, 2025 | Siddhanth Poonja | 1–0 | Mrithyunjay Mahadevan | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Caro-Kann Defense: Panov Attack, Modern Defense | |
| Oct 17, 2025 | Jinan Jomon | ½–½ | Siddhanth Poonja | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Oct 16, 2025 | Siddhanth Poonja | 1–0 | Ashwin Sairam | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Catalan Opening: Open Defense, Classical Line | |
| 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 | Siddhanth Poonja | ½–½ | Oblitas | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | English Opening: Great Snake Variation | |
| Oct 14, 2025 | Claverie | 0–1 | Siddhanth Poonja | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | Sicilian Defense: Lasker-Dunne Attack | |
| Oct 14, 2025 | Siddhanth Poonja | ½–½ | Palencia Morales | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | English Opening: King's English Variation, Four Knights Variation, Quiet Line | |
| Oct 10, 2025 | Siddhanth Poonja | ½–½ | Podolchenko | 32nd Tamil Nadu IM Norm Closed Circuit Chess Tournament - Chennai | English Opening: Anglo-Indian Defense, Queen's Knight Variation | |
| Sep 9, 2025 | Dharsh M | 0–1 | Siddhanth Poonja | 38th National Under 13 Open Chess Championship | Zukertort Opening: Sicilian Invitation | |
| Sep 8, 2025 | Siddhanth Poonja | 1–0 | Salunke Siddhant | 38th National Under 13 Open Chess Championship | English Opening: King's English Variation | |
| Sep 7, 2025 | Samuel Stephen Noble S | ½–½ | Siddhanth Poonja | 38th National Under 13 Open Chess Championship | Queen's Gambit Declined: Ragozin Defense, Alekhine Variation | |
| Sep 6, 2025 | Siddhanth Poonja | 1–0 | Shubh Atha | 38th National Under 13 Open Chess Championship | English Opening: Agincourt Defense | |
| Sep 2, 2025 | Madhvendra Pratap Sharma | 1–0 | Siddhanth Poonja | 38th National Under 13 Open Chess Championship | Sicilian Defense: Accelerated Dragon, Modern Bc4 Variation | |
| Sep 2, 2025 | Ankit Das | ½–½ | Siddhanth Poonja | 38th National Under 13 Open Chess Championship | Nimzo-Indian Defense: Classical Variation | |
| Sep 2, 2025 | Siddhanth Poonja | 1–0 | Rishen Jilowa | 38th National Under 13 Open Chess Championship | Catalan Opening | |
| Sep 2, 2025 | Johan Sunil | 0–1 | Siddhanth Poonja | 38th National Under 13 Open Chess Championship | Queen's Gambit Declined: Ragozin Defense, Alekhine Variation | |
| Sep 2, 2025 | Siddhanth Poonja | 1–0 | Kagwade Kaveesh | 38th National Under 13 Open Chess Championship | Catalan Opening | |
| Jun 24, 2025 | Siddhanth Poonja | 0–1 | Deepan Chakkravarthy J. | Round 9: Siddhanth Poonja - Deepan Chakkravarthy J. | English Opening: King's English Variation | |
| Jun 23, 2025 | Nikitenko | 0–1 | Siddhanth Poonja | Round 8: Nikitenko, Mihail - Siddhanth Poonja | Bogo-Indian Defense: Retreat Variation | |
| Jun 22, 2025 | Siddhanth Poonja | 1–0 | Rachit H Gurnani | Round 7: Siddhanth Poonja - Rachit H Gurnani | English Opening: King's English Variation | |
| Jun 20, 2025 | Siddhanth Poonja | 0–1 | Gharibyan | Aurionpro International Grandmaster Chess Tournament 2025 | English Opening: King's English Variation | |
| Jun 19, 2025 | Kulkarni | 0–1 | Siddhanth Poonja | Aurionpro International Grandmasters Chess Tournament 2025 | English Opening: Symmetrical Variation, Botvinnik System | |
| May 7, 2025 | Dzhumaev | 1–0 | Siddhanth Poonja | KCA’s International Chess Festival God’s Own Country’s 1st GM International Category-A | Sicilian Defense: Accelerated Dragon, Modern Variation | |
| May 6, 2025 | Siddhanth Poonja | ½–½ | Nguyen Van Huy | KCA’s International Chess Festival God’s Own Country’s 1st GM International Category-A | English Opening: Anglo-Indian Defense | |
| May 5, 2025 | Karthikeyan | ½–½ | Siddhanth Poonja | KCA’s International Chess Festival God’s Own Country’s 1st GM International Category-A | Bogo-Indian Defense: Retreat Variation | |
| May 1, 2025 | Siddhanth Poonja | 0–1 | Pantsulaia | KCA’s International Chess Festival God’s Own Country’s 1st GM International Category-A | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Apr 16, 2025 | Siddhanth Poonja | 0–1 | Venkatesh | Round 8: Siddhanth Poonja - Venkatesh, M.R. | English Opening: King's English Variation | |
| Apr 15, 2025 | Sanket Chakravarty | 0–1 | Siddhanth Poonja | Round 7: Sanket Chakravarty - Siddhanth Poonja | Colle System: Rhamphorhynchus Variation | |
| Mar 10, 2025 | Challa Saharsha | ½–½ | Siddhanth Poonja | National Men Team Championship 2025 | Rapport-Jobava System | |
| Mar 8, 2025 | Kolla Bhaavan | ½–½ | Siddhanth Poonja | National Men Team Championship 2025 | Sicilian Defense: Hyperaccelerated Fianchetto | |
| Mar 6, 2025 | Sidhant | 1–0 | Siddhanth Poonja | National Men Team Championship 2025 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Jan 3, 2025 | Nguyen | ½–½ | Siddhanth Poonja | 15th Chennai Open GM Event 2024 | Sicilian Defense: Accelerated Dragon, Modern Bc4 Variation | |
| Nov 7, 2024 | Siddhanth Poonja | 0–1 | Arshpreet Singh | National Sub Junior Open and Girls Chess Championship 2024 | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Nov 7, 2024 | Jaiveer Mahendru | ½–½ | Siddhanth Poonja | National Sub Junior Open and Girls Chess Championship 2024 | Sicilian Defense: Lasker-Pelikan Variation | |
| Nov 6, 2024 | Siddhanth Poonja | ½–½ | Madhvendra Pratap Sharma | National Sub Junior Open and Girls Chess Championship 2024 | English Opening: Agincourt Defense | |
| Nov 5, 2024 | Surya | 0–1 | Siddhanth Poonja | National Sub Junior Open and Girls Chess Championship 2024 | Sicilian Defense: Nyezhmetdinov-Rossolimo Attack | |
| Sep 13, 2024 | Yeshas H | 0–1 | Siddhanth Poonja | Round 9: Yeshas H - Siddhanth Poonja | Bogo-Indian Defense: Retreat Variation | |
| Sep 13, 2024 | Siddhanth Poonja | ½–½ | Niranjan J Warrier | Round 8: Siddhanth Poonja - Niranjan J Warrier | King's Indian Defense: Fianchetto Variation, Uhlmann-Szabo System | |
| Sep 13, 2024 | Siddhanth Poonja | 1–0 | Avyan Shah | Round 7: Siddhanth Poonja - Avyan Shah | Catalan Opening | |
| Sep 13, 2024 | Vishwajit S | 0–1 | Siddhanth Poonja | Round 6: Vishwajit S - Siddhanth Poonja | Rapport-Jobava System | |
| Sep 13, 2024 | Siddhanth Poonja | 1–0 | Vikrant Krishnakumar | Round 5: Siddhanth Poonja - Vikrant Krishnakumar | Indian Defense: King's Indian Variation, Fianchetto Variation | |
| Sep 13, 2024 | Vrishank Royadu | 0–1 | Siddhanth Poonja | Round 4: Vrishank Royadu - Siddhanth Poonja | Queen's Pawn Game: Colle System, Grünfeld Formation | |
| Sep 13, 2024 | Siddhanth Poonja | 1–0 | Hari K Annamalai | Round 3: Siddhanth Poonja - Hari K Annamalai | English Opening: King's English Variation | |
| Jul 2, 2024 | Zhang | 1–0 | Siddhanth Poonja | Game 2: Zhang, Haoxuan(ZJ) - Siddhanth Poonja | Sicilian Defense: Hyperaccelerated Dragon | |
| Jul 1, 2024 | Siddhanth Poonja | ½–½ | Zhang | Game 1: Siddhanth Poonja - Zhang, Haoxuan(ZJ) | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Jun 29, 2024 | Syed Abdul Khader | 1–0 | Siddhanth Poonja | Round 7: Syed Abdul Khader - Siddhanth Poonja | Nimzo-Indian Defense: Sämisch Variation | |
| Jun 28, 2024 | Siddhanth Poonja | 1–0 | Haresh | Round 6: Siddhanth Poonja - Haresh, Venkata Narayanaswamy | English Opening: Symmetrical Variation, Mecking Variation | |
| Jun 27, 2024 | Siddhanth Poonja | 0–1 | Guo | Round 5: Siddhanth Poonja - Guo, Ethan | Queen's Pawn Game: London System | |
| Jun 25, 2024 | Yang | ½–½ | Siddhanth Poonja | Round 3: Yang, ZiLong - Siddhanth Poonja | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jun 24, 2024 | Siddhanth Poonja | 1–0 | Yin | Round 2: Siddhanth Poonja - Yin, Zeming | English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense | |
| Jun 23, 2024 | Lee | 0–1 | Siddhanth Poonja | Round 1: Lee, Daniel Joshua - Siddhanth Poonja | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Jun 21, 2024 | Obidov | ½–½ | Siddhanth Poonja | Round 4: Obidov, Biloliddin - Siddhanth Poonja | Sicilian Defense: Hyperaccelerated Dragon | |
| Jun 20, 2024 | Kakavand | 0–1 | Siddhanth Poonja | Round 1: Kakavand, Ramtin - Siddhanth Poonja | Sicilian Defense: Hyperaccelerated Fianchetto | |
| Jun 19, 2024 | Siddhanth Poonja | 1–0 | Aadik Theophane Lenin | Round 9: Siddhanth Poonja - Aadik Theophane Lenin | Rapport-Jobava System | |
| Jun 15, 2024 | Siddhanth Poonja | 1–0 | Sanches-Shananin | Round 5: Siddhanth Poonja - Sanches-Shananin, Adrian | Queen's Pawn Game: London System | |
| Jun 11, 2024 | Siddhanth Poonja | 0–1 | Kakavand | Round 7: Siddhanth Poonja - Kakavand, Ramtin | Queen's Pawn Game: London System | |
| Jun 11, 2024 | Siddhanth Poonja | 1–0 | Nguyen | Round 7: Siddhanth Poonja - Nguyen, Le Nguyen | Indian Defense | |
| Mar 30, 2024 | Pranesh M | 1–0 | Siddhanth Poonja | 6th SHAASTRA Rapid FIDE Rated Chess Tournament 2024 - IIT Madras | Sicilian Defense: Accelerated Dragon, Maróczy Bind | |
| Dec 23, 2024 | Mehul Sondhi | ½–½ | Siddhanth Poonja | Round 11: Mehul Sondhi - Siddhanth Poonja | Sicilian Defense: Alapin Variation | |
| Dec 21, 2024 | Siddhanth Poonja | 0–1 | Adhiraj Mitra | Round 8: Siddhanth Poonja - Adhiraj Mitra | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Dec 21, 2024 | Jval Saurin Patel | 1–0 | Siddhanth Poonja | Round 7: Jval Saurin Patel - Siddhanth Poonja | Queen's Gambit Declined: Janowski Variation | |