 
                                    | Date | Players & Opening | Result | ECO | View | 
|---|---|---|---|---|
| 2019.07.21 | Peramunetilleke, Seth (1408)  vs (1815) Madrid Sole, Antonio XXI Obert Internacional Sant Martí 2019 French - Spielmann | 1-0 | C00 | |
| 2019.07.20 | Peramunetilleke, Seth (1408)  vs (1784) Corominas Garrido, Jordi XXI Obert Internacional Sant Martí 2019 French - Spielmann | 1-0 | C00 | |
| 2019.07.19 | Farre Buil, Carles (1772)  vs (1408) Peramunetilleke, Seth XXI Obert Internacional Sant Martí 2019 Semi-Slav - Anti-Meran | 0-1 | D43 | |
| 2019.07.18 | Peramunetilleke, Seth (1408)  vs (1856) Costa Trave, Jaume XXI Obert Internacional Sant Martí 2019 French - Spielmann | 0-1 | C00 | |
| 2019.07.17 | Sumelzo Lozano, Jose (1870)  vs (1408) Peramunetilleke, Seth XXI Obert Internacional Sant Martí 2019 Petrov - Indian | 1/2-1/2 | C42 | |
| 2019.07.16 | Peramunetilleke, Seth (1408)  vs (1879) Cornejo Vera, Danilo XXI Obert Internacional Sant Martí 2019 Sicilian Alapin | 1/2-1/2 | B22 | |
| 2019.07.15 | Pujal Moncho, Joaquim (1797)  vs (1408) Peramunetilleke, Seth XXI Obert Internacional Sant Martí 2019 Queen's Pawn | 0-1 | D00 | |
| 2019.07.14 | Peramunetilleke, Seth (1408)  vs (1807) Corominas Garrido, Antonio XXI Obert Internacional Sant Martí 2019 Caro-Kann Exchange | 1/2-1/2 | B13 | |
| 2019.07.13 | Garcia Clemente, Julian Fco. (1813)  vs (1408) Peramunetilleke, Seth XXI Obert Internacional Sant Martí 2019 Slav | 0-1 | D10 | |
| 2018.01.14 | Liu, Max Yuan vs (1379) Peramunetilleke, Seth Hong Kong National Junior Chess Championship 2018 Petrov - Kaufmann | 0-1 | C42 | |
| 2018.01.14 | Peramunetilleke, Seth (1379)  vs (1264) Du, Zongrui Hong Kong National Junior Chess Championship 2018 Sicilian Alapin | 0-1 | B22 | |
| 2018.01.13 | Deng, Yu Dong Michael (1821)  vs (1379) Peramunetilleke, Seth Hong Kong National Junior Chess Championship 2018 Queen's Indian Fianchetto - Nimzovich | 1/2-1/2 | E15 | |
| 2018.01.13 | Peramunetilleke, Seth (1379)  vs (1044) Wu, Shu Hong Hong Kong National Junior Chess Championship 2018 Giuoco Piano - Greco (Moller) | 1-0 | C54 | |
| 2018.01.13 | Kwok, Hiu Nok Taylor (1068)  vs (1379) Peramunetilleke, Seth Hong Kong National Junior Chess Championship 2018 Slav | 0-1 | D10 | |
| 2017.11.12 | Peramunetilleke, Seth (1386)  vs Chang, Nathan The Chess Academy ActiveKids Fall Open 2017 (Rated Standard) Philidor | 1-0 | C41 | |
| 2017.11.05 | Ho, In Hei Henry (1768)  vs (1386) Peramunetilleke, Seth The Chess Academy ActiveKids Fall Open 2017 (Rated Standard) Petrov - Three Knights | 1-0 | C42 | |
| 2017.10.29 | Peramunetilleke, Seth (1386)  vs (1371) Dai, Andrew Sicheng The Chess Academy ActiveKids Fall Open 2017 (Rated Standard) Scandinavian | 1-0 | B01 | |
| 2017.10.22 | Peramunetilleke, Seth (1386)  vs (1990) Leung, Ho Yan Andrew The Chess Academy ActiveKids Fall Open 2017 (Rated Standard) Sicilian Center Game - Smith-Morra | 0-1 | B21 | |
| 2017.10.08 | Yan, Joseph (1328)  vs (1386) Peramunetilleke, Seth The Chess Academy ActiveKids Fall Open 2017 (Rated Standard) Queen's Pawn - London | 0-1 | D02 | |
| 2017.01.22 | Peramunetilleke, Seth vs (1394) Hu, Yik Kwan CAISSA Hong Kong National Junior Chess Championships 2017 Caro-Kann Exchange | 0-1 | B13 | |
| 2017.01.22 | Peramunetilleke, Seth vs (1088) Pang, Bo CAISSA Hong Kong National Junior Chess Championships 2017 Two Knights - Blackburne | 1-0 | C58 | |
| 2017.01.22 | Fung, Wilbert vs Peramunetilleke, Seth CAISSA Hong Kong National Junior Chess Championships 2017 Queen's Pawn Zukertort - London | 0-1 | D02 | |
| 2017.01.21 | Peramunetilleke, Seth vs Yin, Richard CAISSA Hong Kong National Junior Chess Championships 2017 Giuoco Piano - Greco (Aitken) | 0-1 | C54 | |
| 2017.01.21 | Yeung, Lok Yan Michelle vs Peramunetilleke, Seth CAISSA Hong Kong National Junior Chess Championships 2017 Italian | 0-1 | C50 | |
| 2017.01.21 | Peramunetilleke, Seth vs (1337) Bao, Jin Wen CAISSA Hong Kong National Junior Chess Championships 2017 Sicilian Center Game - Smith-Morra | 1/2-1/2 | B21 | |
| 2017.01.21 | King, Alistair (1264)  vs Peramunetilleke, Seth CAISSA Hong Kong National Junior Chess Championships 2017 Slav Two Knights | 0-1 | D15 | 
| Date | Players & Opening | Result | ECO | View | 
|---|---|---|---|---|
| 2025.06.09 | Peramunetilleke,Seth (2010) vs (1959) Anup Kumar,Vihaan NSW Open 2025 Petrov Modern - Symmetrical | 1-0 | C43 | |
| 2025.06.09 | Lo,Willis (2064) vs (2010) Peramunetilleke,Seth NSW Open 2025 Queen's Pawn Zukertort - London | 1/2-1/2 | D02 | |
| 2025.06.07 | Peramunetilleke,Seth (2010) vs (1956) Vincent,Alaina NSW Open 2025 Sicilian Alapin - Smith-Morra | 0-1 | B22 | |
| 2023.01.24 | Peramunetilleke,Seth (1841) vs (2405) Bjelobrk,I Oceania Zonal 2023 Sicilian Alapin - Smith-Morra | 1/2-1/2 | B22 | |
| 2022.06.11 | Peramunetilleke,Savin Kavindu (1496) vs (2332) Lane,G NSW Open 2022 Four Knights - Scotch | 0-1 | C47 |