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| Date | Players & Opening | Result | ECO | View |
|---|---|---|---|---|
| 2025.03.18 | Muhammed, Shuaau (2107) vs (2010) Amarathunga, Kosala Sandeepa Chamikara Asian Zonal Chess Championship 2025 - Zone 3.2 (Open) French Tarrasch |
1-0 | C03 | |
| 2024.08.02 | Amarathunga, Kosala Sandeepa Chamikara (1992) vs (2324) Barsov, Alexei DINI International Chess Championship 2024 French - Exchange |
0-1 | C01 | |
| 2024.08.01 | Deepan, Chakkravarthy J. (2423) vs (1992) Amarathunga, Kosala Sandeepa Chamikara DINI International Chess Championship 2024 French - Exchange |
1-0 | C01 | |
| 2024.07.31 | Amarathunga, Kosala Sandeepa Chamikara (1992) vs (1726) Samaranayake, Pamok Methdinu DINI International Chess Championship 2024 Sicilian Rossolimo (Fianchetto) - Rossolimo |
1/2-1/2 | B31 | |
| 2024.07.31 | Induwara, T H D Thisarindu (1835) vs (1992) Amarathunga, Kosala Sandeepa Chamikara DINI International Chess Championship 2024 French Advance - Milner-Barry |
0-1 | C02 | |
| 2024.07.29 | Amarathunga, Kosala Sandeepa Chamikara (1992) vs (1857) Insara, S D Nadev DINI International Chess Championship 2024 Sicilian Rossolimo (Fianchetto) - Rossolimo |
1/2-1/2 | B31 | |
| 2024.07.09 | Manon, Reja Neer (2424) vs (1992) Amarathunga, Kosala Sandeepa Chamikara 7th Western Asian Youth Chess Championship 2024 - Under 18 Open (2006 & 2007) French Advance Winawer - Classical |
1-0 | C18 | |
| 2024.04.29 | Amarathunga, Kosala Sandeepa Chamikara (1772) vs (2101) Azali, Tannaz Asian Cities Chess Team Championship 2024 Sicilian - Anderssen |
1/2-1/2 | B40 | |
| 2024.04.28 | Manelyuk, Daniil (2267) vs (1772) Amarathunga, Kosala Sandeepa Chamikara Asian Cities Chess Team Championship 2024 French Advance Winawer - Bogolubov |
1-0 | C17 | |
| 2024.04.27 | Amarathunga, Kosala Sandeepa Chamikara (1772) vs (2230) Khudyakov, Stanislav Asian Cities Chess Team Championship 2024 Two Knights - Pianissimo |
0-1 | C54 | |
| 2024.04.26 | Al-Ali, Hussein Ali Hussein (2135) vs (1772) Amarathunga, Kosala Sandeepa Chamikara Asian Cities Chess Team Championship 2024 Reti King's Indian |
1-0 | A08 | |
| 2024.04.25 | Malygin, Vladislav (2268) vs (1772) Amarathunga, Kosala Sandeepa Chamikara Asian Cities Chess Team Championship 2024 English Agincourt |
1/2-1/2 | A13 | |
| 2024.04.24 | Amarathunga, Kosala Sandeepa Chamikara (1772) vs (2584) Daneshvar, Bardiya Asian Cities Chess Team Championship 2024 Sicilian |
0-1 | B50 | |
| 2024.04.23 | Amarathunga, Kosala Sandeepa Chamikara (1772) vs (2044) Al Maashani, Amer Asian Cities Chess Team Championship 2024 Sicilian Dragon - Hungarian |
1-0 | B70 | |
| 2024.04.22 | Alazzah, Ahmad (1836) vs (1772) Amarathunga, Kosala Sandeepa Chamikara Asian Cities Chess Team Championship 2024 French - Hanham |
0-1 | C00 | |
| 2024.04.21 | Amarathunga, Kosala Sandeepa Chamikara (1772) vs (2536) Iljiushenok, Ilia Asian Cities Chess Team Championship 2024 Sicilian Scheveningen Najdorf - Byrne |
0-1 | B90 | |
| 2024.03.11 | Amarathunga, Kosala Sandeepa Chamikara (1772) vs (1860) Dabarera, G W D M Sri Lanka National Premier Division Chess Championship - 2024 Sicilian |
1-0 | B40 | |
| 2024.03.11 | Dandeniya, D D L N (1800) vs (1772) Amarathunga, Kosala Sandeepa Chamikara Sri Lanka National Premier Division Chess Championship - 2024 Indian Knight - Catalan |
0-1 | D02 | |
| 2024.03.10 | Liyanage, Pesandu Rashmitha (1871) vs (1772) Amarathunga, Kosala Sandeepa Chamikara Sri Lanka National Premier Division Chess Championship - 2024 Indian - Trompowsky |
1-0 | A45 | |
| 2024.03.09 | Amarathunga, Kosala Sandeepa Chamikara (1772) vs (1705) Hansana, G Haritha Sri Lanka National Premier Division Chess Championship - 2024 Two Knights - Italian |
1/2-1/2 | C55 | |
| 2024.03.09 | Peiris, T S S (1886) vs (1772) Amarathunga, Kosala Sandeepa Chamikara Sri Lanka National Premier Division Chess Championship - 2024 Bird |
0-1 | A02 | |
| 2024.02.03 | Dabarera, G W D M (1771) vs (1493) Amarathunga, Kosala Sandeepa Chamikara 10th Kalutara Chess Festival 2024 French Advance - Milner-Barry |
1-0 | C02 | |
| 2024.02.02 | Amarathunga, Kosala Sandeepa Chamikara (1493) vs (1584) Rathnayake, R M Dulinma Hemalni 10th Kalutara Chess Festival 2024 Sicilian Moscow |
1/2-1/2 | B52 | |
| 2024.02.02 | Amarathunga, Kosala Sandeepa Chamikara (1493) vs (1678) Amarasinghe, A A C B 10th Kalutara Chess Festival 2024 Sicilian |
1-0 | B40 | |
| 2024.09.11 | Quesada Perez, Luis Ernesto (2578) vs (1956) Amarathunga, Kosala Sandeepa Chamikara 45th Olympiad Budapest 2024 Irregular Indian |
1-0 | E10 | |
| 2023.08.06 | Amarathunga, Kosala Sandeepa Chamikara (1513) vs (1616) Manuwaruna, Sethun Neththaru 9th National Amateur International Rated Open Chess Championship 2023 Pirc Austrian - Dragon |
1/2-1/2 | B09 | |
| 2023.08.05 | Amarathunga, Kosala Sandeepa Chamikara (1513) vs (1601) Gunawardhana, Devindya Oshini 9th National Amateur International Rated Open Chess Championship 2023 Two Knights Blackburne - Suhle |
0-1 | C59 | |
| 2023.07.01 | Liyanage, Pesandu Rashmitha (1893) vs (1464) Amarathunga, Kosala Sandeepa Chamikara Sri Lanka Open International Rating Chess Championship 2023 Reti Symmetrical - King's Indian |
1-0 | A05 | |
| 2023.06.30 | Amarathunga, Kosala Sandeepa Chamikara (1464) vs (1843) Amarasinghe, A A C B Sri Lanka Open International Rating Chess Championship 2023 |
1-0 | ||
| 2023.03.05 | Amarathunga, Kosala Sandeepa Chamikara (1561) vs (1830) Ilampoornan, Raguparan Sri Lanka National B Chess Championships - 2023 French - Exchange |
0-1 | C01 | |
| 2022.11.16 | Kiriella, K G T S D (1845) vs (1394) Amarathunga, Kosala Sandeepa Chamikara Commonwealth Youth Chess Championship 2022 - U 18 Open & Girls French Open Tarrasch (Exchange) |
1-0 | C08 | |
| 2022.03.16 | Amarathunga, Kosala Sandeepa Chamikara (1401) vs (1844) Amarasinghe, A A C B Sri Lanka National B Chess Championship 2022 Robatsch |
0-1 | B06 | |
| 2021.12.22 | Amarathunga, Kosala Sandeepa Chamikara (1319) vs (1827) Liyanage, Pesandu Rashmitha Asian Juniors Chess Championship - 2021 Sicilian Scheveningen Najdorf |
0-1 | B90 | |
| 2021.12.20 | Amarathunga, Kosala Sandeepa Chamikara (1319) vs (1579) Tennakoon, Lisara Samadhith Asian Juniors Chess Championship - 2021 Sicilian Moscow |
0-1 | B51 | |
| 2021.12.19 | Saravanabaavan, Brijeash (1525) vs (1319) Amarathunga, Kosala Sandeepa Chamikara Asian Juniors Chess Championship - 2021 |
1/2-1/2 | ||
| 2021.12.19 | Amarathunga, Kosala Sandeepa Chamikara (1319) vs (1479) Jayawardana, Chenuka Nethvidu Asian Juniors Chess Championship - 2021 Sicilian |
1-0 | B40 | |
| 2021.12.18 | Al Shamsi, Hamad Naseer (1667) vs (1319) Amarathunga, Kosala Sandeepa Chamikara Asian Juniors Chess Championship - 2021 French Closed Tarrasch |
1-0 | C05 | |
| 2021.12.17 | Amarathunga, Kosala Sandeepa Chamikara (1319) vs (1017) Upeksha, L H I Asian Juniors Chess Championship - 2021 French - Exchange |
1-0 | C01 | |
| 2021.12.17 | Raahul, V S (2387) vs (1319) Amarathunga, Kosala Sandeepa Chamikara Asian Juniors Chess Championship - 2021 English Mikenas - French |
1-0 | A18 | |
| 2021.11.26 | Amarathunga, Kosala Sandeepa Chamikara (1353) vs (1286) Babaei, Amir Hossein Asian Academies Hybrid Chess Championship Caro-Kann Knight Classical |
0-1 | B19 | |
| 2021.11.25 | Amarathunga, Kosala Sandeepa Chamikara (1353) vs (1988) Sakline Mostafa, Sajid Asian Academies Hybrid Chess Championship Sicilian |
0-1 | B40 | |
| 2021.11.24 | Naimanov, Galymzhan (1256) vs (1353) Amarathunga, Kosala Sandeepa Chamikara Asian Academies Hybrid Chess Championship French - Hanham |
1/2-1/2 | C00 | |
| 2021.11.23 | Amarathunga, Kosala Sandeepa Chamikara (1353) vs (1410) Kazi Afsan Rawnak, Anan Asian Academies Hybrid Chess Championship Sicilian Moscow |
0-1 | B52 | |
| 2021.11.22 | Waleed Abdullah, Khaled (1568) vs (1353) Amarathunga, Kosala Sandeepa Chamikara Asian Academies Hybrid Chess Championship French Advance Winawer - Poisoned Pawn |
1/2-1/2 | C18 | |
| 2021.11.05 | Akrami, Tohid (1075) vs (1353) Amarathunga, Kosala Sandeepa Chamikara Asian Club Hybrid Chess Championship Neo-Indian - Seirawan |
0-1 | E00 | |
| 2021.11.03 | Tin, Jingyao (2485) vs (1353) Amarathunga, Kosala Sandeepa Chamikara Asian Club Hybrid Chess Championship Irregular Indian |
1-0 | E10 | |
| 2021.10.31 | Li, Shing Hei (1342) vs (1071) Amarathunga, Kosala Sandeepa Chamikara Eastern Asia Youth Online Chess Championship - Under 10 Girls Irregular Indian |
1/2-1/2 | E10 | |
| 2021.10.31 | Amarathunga, Kosala Sandeepa Chamikara (1071) vs (1697) Velarde, Jerish John Eastern Asia Youth Online Chess Championship - Under 10 Girls Pirc |
0-1 | B07 | |
| 2021.10.31 | Biriya, Mohammadamin (1616) vs (1071) Amarathunga, Kosala Sandeepa Chamikara Eastern Asia Youth Online Chess Championship - Under 10 Girls Indian |
1-0 | A45 | |
| 2021.10.30 | Amarathunga, Kosala Sandeepa Chamikara (1071) vs (1569) Tavazo, Amirparsa Eastern Asia Youth Online Chess Championship - Under 10 Girls Caro-Kann Knight Classical |
0-1 | B19 | |
| 2021.10.30 | Loo, Pin Xie (1593) vs (1071) Amarathunga, Kosala Sandeepa Chamikara Eastern Asia Youth Online Chess Championship - Under 10 Girls French - Exchange |
0-1 | C01 | |
| 2021.10.30 | Amarathunga, Kosala Sandeepa Chamikara (1071) vs (1737) Vu, Hoang Gia Bao Eastern Asia Youth Online Chess Championship - Under 10 Girls Sicilian Rossolimo (Fianchetto) - Rossolimo |
0-1 | B31 | |
| 2021.10.29 | Hisham, Nik Emer (1535) vs (1071) Amarathunga, Kosala Sandeepa Chamikara Eastern Asia Youth Online Chess Championship - Under 10 Girls French Closed Tarrasch |
0-1 | C05 | |
| 2021.10.29 | Amarathunga, Kosala Sandeepa Chamikara (1071) vs (1435) Lam, Theodore Lukas Eastern Asia Youth Online Chess Championship - Under 10 Girls Pirc |
1-0 | B07 | |
| 2021.10.29 | S, Harshad (1627) vs (1071) Amarathunga, Kosala Sandeepa Chamikara Eastern Asia Youth Online Chess Championship - Under 10 Girls French - Schlechter |
1-0 | C01 |
