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| Date | Chess tournament name | Status | ||
|---|---|---|---|---|
| No results | No results | No results | No results | No results |
| Date | Players & Opening | Result | ECO | View |
|---|---|---|---|---|
| No results | No results | No results | No results | No results |
| Date | Players & Opening | Result | ECO | View |
|---|---|---|---|---|
| 2025.06.22 | Koster,R (2317) vs (2213) Stolwijk,Colin HSG Open 2025 Nimzo-Indian St. Petersburg (Fischer) |
1/2-1/2 | E44 | |
| 2025.06.22 | De Jong,Lode (2108) vs (2317) Koster,R HSG Open 2025 Sicilian Scheveningen Najdorf - Byrne |
1-0 | B90 | |
| 2025.06.21 | Koster,R (2317) vs (2053) De Vries,Leon HSG Open 2025 Gruenfeld Exchange (Classical) |
1-0 | D86 | |
| 2025.06.21 | Thijssen,Freek (2122) vs (2317) Koster,R HSG Open 2025 Sicilian Scheveningen Najdorf |
0-1 | B90 | |
| 2025.05.18 | Ritzerveld,Noah (2272) vs (2123) Koster,Chiel 15th WLC Weekender 2025 Sicilian - Pelikan |
1/2-1/2 | B33 | |
| 2025.05.18 | Koster,Chiel (2123) vs (2211) Kazarjan,Gachatur 15th WLC Weekender 2025 Reti King's Indian |
1/2-1/2 | A08 | |
| 2025.05.17 | Vennix,Tom (1971) vs (2123) Koster,Chiel 15th WLC Weekender 2025 Benko's opening - Taimanov |
0-1 | A25 | |
| 2025.05.17 | Koster,Chiel (2123) vs (1995) De Vries,Emma 15th WLC Weekender 2025 Gruenfeld Kemeri (Kashdan) - King's Indian |
1-0 | D79 | |
| 2025.05.16 | Blijlevens,P (1890) vs (2123) Koster,Chiel 15th WLC Weekender 2025 Indian - Trompowsky |
1/2-1/2 | A45 | |
| 2025.06.08 | Koster,Chiel (2141) vs (2312) Kurt,Sascha 17th BPB Limburg Open English Three Knights - Dutch |
1/2-1/2 | A27 | |
| 2025.06.07 | Barzen,P (2348) vs (2141) Koster,Chiel 17th BPB Limburg Open Sicilian |
1-0 | B30 | |
| 2024.12.30 | Mareau,Timothe (2168) vs (2330) Koster,R 60th Groningen Open 2024 Sicilian Closed |
0-1 | B23 | |
| 2024.12.29 | Koster,R (2330) vs (2187) Cernov,Henrik 60th Groningen Open 2024 Nimzo-Indian St. Petersburg Rubinstein (Normal) |
1/2-1/2 | E47 | |
| 2024.12.28 | Albers,Sasa (2268) vs (2330) Koster,R 60th Groningen Open 2024 Sicilian Scheveningen Najdorf - Byrne |
1/2-1/2 | B90 | |
| 2024.12.27 | Koster,R (2330) vs (2446) De Winter,Arthur 60th Groningen Open 2024 Irregular Queen's Pawn - English |
0-1 | A40 | |
| 2024.12.26 | Weber,Samuel (2263) vs (2330) Koster,R 60th Groningen Open 2024 Sicilian Scheveningen Najdorf - Adams |
0-1 | B90 | |
| 2024.12.24 | Koster,R (2330) vs (2183) Grooten,H 60th Groningen Open 2024 Nimzo-Indian Rubinstein |
1-0 | E42 | |
| 2024.12.23 | Narayanan,SL (2647) vs (2330) Koster,R 60th Groningen Open 2024 Reti Symmetrical |
1-0 | A05 | |
| 2024.12.22 | Koster,R (2330) vs (2160) Hummel,Pau 60th Groningen Open 2024 Nimzo-Indian St. Petersburg Rubinstein (Normal) |
1-0 | E47 | |
| 2024.12.21 | Grooten,Tommy (2153) vs (2330) Koster,R 60th Groningen Open 2024 Slav Rubinstein |
1/2-1/2 | D11 | |
| 2024.06.02 | Koster,Chiel (2046) vs (2220) Baselmans,Sam 14th WLC Weekender 2024 Two Knights - Modern Bishop |
0-1 | C55 | |
| 2024.06.02 | Coronel,Joshua (2055) vs (2046) Koster,Chiel 14th WLC Weekender 2024 Sicilian Rossolimo (Fianchetto) - Rossolimo |
0-1 | B31 | |
| 2024.06.01 | Koster,Chiel (2046) vs (2065) Kools,Thomas 14th WLC Weekender 2024 English Closed Sicilian - Taimanov |
1/2-1/2 | A25 | |
| 2024.06.01 | Matthijssen,Mitchell (1893) vs (2046) Koster,Chiel 14th WLC Weekender 2024 Sicilian - Pelikan (Chelyabinsk) |
0-1 | B33 | |
| 2024.06.01 | Koster,Chiel (2046) vs (2501) Beerdsen,Thomas 14th WLC Weekender 2024 Caro-Kann |
0-1 | B11 | |
| 2024.05.31 | Van Happen,Niels (1692) vs (2046) Koster,Chiel 14th WLC Weekender 2024 Sicilian - Pelikan (Chelyabinsk) |
0-1 | B33 | |
| 2024.08.01 | Koster,Chiel (2058) vs (2146) Grooten,Tommy Dutch Open 2024 Sicilian Scheveningen - Anderssen |
1/2-1/2 | B80 | |
| 2024.07.31 | Zwirs,Jasper (2088) vs (2058) Koster,Chiel Dutch Open 2024 Indian |
1/2-1/2 | A45 | |
| 2024.07.30 | Koster,Chiel (2058) vs (2478) Buckels,Valentin Dutch Open 2024 Caro-Kann |
0-1 | B11 | |
| 2024.07.29 | Stillger,B (2263) vs (2058) Koster,Chiel Dutch Open 2024 Reti King's Indian |
0-1 | A07 | |
| 2024.07.27 | Koster,Chiel (2058) vs (1969) Smit,Manuel Dutch Open 2024 Reti Symmetrical - King's Fianchetto |
1-0 | A15 | |
| 2024.07.26 | Van Kuijk,Vadim (2131) vs (2058) Koster,Chiel Dutch Open 2024 Sicilian - Pelikan (Chelyabinsk) |
1/2-1/2 | B33 | |
| 2024.07.25 | Koster,Chiel (2058) vs (2157) Shakhverdian,William Dutch Open 2024 King's Indian Fianchetto (Panno-Yugoslav) |
0-1 | E66 | |
| 2024.07.24 | Ritzerveld,Noah (2181) vs (2058) Koster,Chiel Dutch Open 2024 French Paulsen - Rubinstein (Capablanca) |
1/2-1/2 | C10 | |
| 2024.07.23 | Koster,Chiel (2058) vs (2211) Grooten,H Dutch Open 2024 Caro-Kann |
1/2-1/2 | B11 | |
| 2023.08.02 | Op den Dries,J (2093) vs (2052) Koster,Chiel Dutch Open 2023 Sicilian Closed - Zukertort |
1-0 | B23 | |
| 2023.08.01 | Koster,Chiel (2052) vs (2178) Vos,T Dutch Open 2023 Bishop's Opening Berlin |
0-1 | C24 | |
| 2023.07.31 | Duijker,R (2198) vs (2052) Koster,Chiel Dutch Open 2023 Benko's opening |
1-0 | A00 | |
| 2023.07.29 | Koster,Chiel (2052) vs (2114) Weidemann,Jakob Dutch Open 2023 Sicilian - Anderssen |
1-0 | B40 | |
| 2023.07.28 | Kurt,Sascha (1986) vs (2052) Koster,Chiel Dutch Open 2023 Sicilian - Mengarini |
1/2-1/2 | B20 | |
| 2023.07.27 | Koster,Chiel (2052) vs (2270) De Boer,Eelke Dutch Open 2023 Polish Sokolsky opening |
0-1 | A00 | |
| 2023.07.26 | Shakhverdian,William (2129) vs (2052) Koster,Chiel Dutch Open 2023 Catalan Open (Classical) |
0-1 | E04 | |
| 2023.07.25 | Koster,Chiel (2052) vs (2362) Maatman,Nick Dutch Open 2023 French - King's Knight |
0-1 | C00 | |
| 2023.05.07 | Bollen,G (2182) vs (2010) Koster,Chiel 13th WLC Weekender 2023 King's Indian Fianchetto (Panno) |
1/2-1/2 | E63 | |
| 2023.05.07 | Koster,Chiel (2010) vs (2240) Sprangers,R 13th WLC Weekender 2023 Sicilian Scheveningen Najdorf - Adams |
1-0 | B90 | |
| 2023.05.06 | Beerdsen,Thomas (2507) vs (2010) Koster,Chiel 13th WLC Weekender 2023 Sicilian Rossolimo (Fianchetto) - Rossolimo |
1-0 | B31 | |
| 2023.05.06 | Koster,Chiel (2010) vs (2340) Baselmans,Luuk 13th WLC Weekender 2023 French - Queen's Knight |
1-0 | C00 | |
| 2023.05.06 | Koes,R (1809) vs (2010) Koster,Chiel 13th WLC Weekender 2023 Sicilian - Wing Gambit |
0-1 | B20 | |
| 2022.05.15 | Koster,Chiel (1924) vs (2264) Van Roon,Sjoerd 12th WLC Weekender 2022 Sicilian Scheveningen Najdorf - Adams |
1/2-1/2 | B90 | |
| 2022.05.15 | Slagboom,Leandro (1997) vs (1924) Koster,Chiel 12th WLC Weekender 2022 Irregular Indian |
0-1 | E10 | |
| 2022.05.14 | Koster,Chiel (1924) vs (2133) Van Helvoort,R 12th WLC Weekender 2022 Robatsch |
1-0 | B06 | |
| 2022.05.14 | Van der Valk,N (2200) vs (1924) Koster,Chiel 12th WLC Weekender 2022 English Four Knights (Fianchetto) |
1/2-1/2 | A29 | |
| 2022.05.14 | Koster,Chiel (1924) vs (1774) Kools,Jasper 12th WLC Weekender 2022 Sicilian Paulsen - Polugaevsky |
1/2-1/2 | B42 | |
| 2022.05.13 | Roebers,Eline (2369) vs (1924) Koster,Chiel 12th WLC Weekender 2022 Sicilian - Pelikan (Chelyabinsk) |
1/2-1/2 | B33 | |
| 2021.03.13 | Koster,Chiel (1913) vs (2294) Styazhkina,A 1st FIDE World Uni BlitzB Italian |
1-0 | C50 | |
| 2021.03.13 | Antonov,Andrey P. (2137) vs (1913) Koster,Chiel 1st FIDE World Uni BlitzB Sicilian |
0-1 | B20 | |
| 2021.03.13 | Koster,Chiel (1913) vs (1327) Obeid,Omar 1st FIDE World Uni BlitzB Scandinavian |
1-0 | B01 | |
| 2021.03.13 | Amaro Alfonso,Raynner (2186) vs (1913) Koster,Chiel 1st FIDE World Uni BlitzB Sicilian - Keres |
1-0 | B20 | |
| 2021.03.13 | Koster,Chiel (1913) vs (2361) Jirasek,Ladia 1st FIDE World Uni BlitzB Scandinavian |
0-1 | B01 | |
| 2021.03.21 | Koster,Chiel (1913) vs (2415) Burri,Quentin 1st FIDE World Uni RapidC Sicilian Scheveningen Najdorf - Adams |
0-1 | B90 | |
| 2021.03.21 | Wienegge,Sophie vs (1913) Koster,Chiel 1st FIDE World Uni RapidC Sicilian - Pelikan (Bird) |
1/2-1/2 | B33 | |
| 2021.03.13 | Bellissimo,Joseph F. (2203) vs (1913) Koster,Chiel 1st FIDE World Uni BlitzB Sicilian |
0-1 | B30 | |
| 2021.03.21 | Koster,Chiel (1913) vs Kulvinder 1st FIDE World Uni RapidC Sicilian Dragon - Classical Dragon |
1/2-1/2 | B72 | |
| 2021.03.13 | Koster,Chiel (1913) vs Souza,Igor Esquivel 1st FIDE World Uni BlitzB Pirc |
1-0 | B07 | |
| 2021.03.21 | Koster,Chiel (1913) vs (1986) Nur Abidah,Shanti 1st FIDE World Uni RapidC Scandinavian |
1-0 | B01 | |
| 2021.03.21 | Thanga Manickam M (1623) vs (1913) Koster,Chiel 1st FIDE World Uni RapidC Neo-Indian - Exchange |
1-0 | D35 | |
| 2021.03.13 | Abbott,Thomas vs (1913) Koster,Chiel 1st FIDE World Uni BlitzB Sicilian Alapin |
0-1 | B22 | |
| 2021.03.21 | Koster,Chiel (1913) vs (2026) Salah,Nadezhda 1st FIDE World Uni RapidC French - Queen's Knight |
1-0 | C00 | |
| 2021.03.20 | Gesyan,Suren (1945) vs (1913) Koster,Chiel 1st FIDE World Uni RapidC Sicilian Closed |
1-0 | B24 | |
| 2021.03.13 | Koster,Chiel (1913) vs (2505) Laurusas,T 1st FIDE World Uni BlitzB Sicilian |
0-1 | B40 | |
| 2021.03.20 | Koster,Chiel (1913) vs (2206) Arpita,Mukherjee 1st FIDE World Uni RapidC Sicilian Scheveningen Najdorf - Adams |
1/2-1/2 | B90 | |
| 2021.03.13 | Jundana,M. Qudwah vs (1913) Koster,Chiel 1st FIDE World Uni BlitzB Van't Kruijs opening |
0-1 | A00 | |
| 2021.03.20 | Sudhanva K V vs (1913) Koster,Chiel 1st FIDE World Uni RapidC English Four Knights (Fianchetto) |
0-1 | A29 | |
| 2021.03.20 | Koster,Chiel (1913) vs Fuentes Flores,Estrella Azucena 1st FIDE World Uni RapidC Two Knights - Modern Bishop |
1-0 | C55 | |
| 2021.03.20 | Albornoz Cabrera,Carlos Daniel (2573) vs (1913) Koster,Chiel 1st FIDE World Uni RapidC Sicilian - Pelikan (Bird) |
1-0 | B33 | |
| 2021.03.20 | Koster,Chiel (1913) vs Murali,Hariprasad 1st FIDE World Uni RapidC Scandinavian |
1-0 | B01 | |
| 2016.09.13 | Koster, Jeroen Louis (1879) vs (2335) Mwali, C. 42nd Olympiad 2016 Polish Sokolsky opening |
0-1 | A00 | |
| 2016.09.12 | Koster, Jeroen Louis (1879) vs (1766) Darwish, Hashim 42nd Olympiad 2016 King's Knight - Scotch Gambit |
1-0 | C44 | |
| 2016.09.11 | Ali Abdullahi Farah vs (1879) Koster, Jeroen Louis 42nd Olympiad 2016 Slav - Neo-Gruenfeld (Schlechter) |
0-1 | D70 | |
| 2016.09.10 | Koster, Jeroen Louis (1879) vs (1670) Benschop, Jomar 42nd Olympiad 2016 Two Knights - Open (Dubois) |
1-0 | C55 | |
| 2016.09.08 | Mlawa, Hemed (1782) vs (1879) Koster, Jeroen Louis 42nd Olympiad 2016 Reti Symmetrical |
1/2-1/2 | A05 | |
| 2016.09.05 | Borigas, E. (1894) vs (1879) Koster, Jeroen Louis 42nd Olympiad 2016 Indian Knight |
1-0 | A46 | |
| 2016.09.03 | Sohib, O. (2153) vs (1879) Koster, Jeroen Louis 42nd Olympiad 2016 Irregular Queen's Pawn - Franco-Indian |
1-0 | A40 | |
| 2016.09.02 | Koster, Jeroen Louis (1879) vs (2542) Ismagambetov, An 42nd Olympiad 2016 English Carls (Keres) - Carls |
0-1 | A23 | |
| 2017.10.05 | Bernstein, Jonas Aug (1645) vs (1538) Kalkman de Koster, F. Oslo Open 2017 Queen's Gambit - Exchange |
1-0 | D35 | |
| 2017.10.04 | Kalkman de Koster, F. (1538) vs (1430) Beitnes, Andreas Rob Oslo Open 2017 Modern Benoni |
1-0 | A60 | |
| 2017.10.03 | Roque Sola, Andrea (1900) vs (1538) Kalkman de Koster, F. Oslo Open 2017 English Sicilian |
1-0 | A20 | |
| 2017.10.02 | Grover, Sigurd Loe (1816) vs (1538) Kalkman de Koster, F. Oslo Open 2017 Italian - Hungarian (Benima) |
1-0 | C50 | |
| 2017.10.01 | Kalkman de Koster, F. (1538) vs (1169) Madsen, Oystein Oslo Open 2017 Irregular Queen's Pawn - Kotov (Robatsch) |
1-0 | A40 | |
| 2017.09.30 | Svanholm, B. (1806) vs (1538) Kalkman de Koster, F. Oslo Open 2017 English Sicilian (Two Knights) |
0-1 | A22 | |
| 2017.09.30 | Kalkman de Koster, F. (1538) vs (1918) Kleinert, J. Oslo Open 2017 Queen's Gambit Accepted - Saduleto |
0-1 | D20 | |
| 2018.10.02 | Kalkman de Koster, F (1510) vs (1216) Lundesgaard, Elling Oslo Open 2018 Queen's Gambit - Marshall |
1-0 | D06 | |
| 2018.10.04 | Kalkman de Koster, F (1510) vs (1409) Eiding, Amanda Mai Irgens Oslo Open 2018 Semi-Slav - Marshall |
1/2-1/2 | D43 | |
| 2018.10.04 | Larre, Linnea (1485) vs (1510) Kalkman de Koster, F Oslo Open 2018 English Symmetrical |
1-0 | A30 | |
| 2018.10.02 | Nordquelle, Amelia (1575) vs (1510) Kalkman de Koster, F Oslo Open 2018 Queen's Gambit - Marshall |
1-0 | D06 | |
| 2018.10.03 | Jorgensen, Asle (1611) vs (1510) Kalkman de Koster, F Oslo Open 2018 King's Gambit Declined - Nimzovich |
1-0 | C30 | |
| 2018.10.01 | Kalkman de Koster, F (1510) vs (1823) Wright, Haakon Oslo Open 2018 Modern Benoni |
0-1 | A60 | |
| 2018.09.30 | Lindbol, Aleksander (2086) vs (1510) Kalkman de Koster, F Oslo Open 2018 English Asymmetrical |
1-0 | A34 | |
| 2019.08.05 | Koster, Paul (1764) vs (1874) De Kleuver, Jonathan 23rd HZ Open 2019 English Anglo-Indian (Queen's Knight) |
1-0 | A16 | |
| 2019.08.06 | Hoffman, Ro (1987) vs (1764) Koster, Paul 23rd HZ Open 2019 English Four Knights - Romanishin |
1-0 | A28 |