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| Date | Chess tournament name | Status |
|---|---|---|
| 2025-06-06 to 2025-06-09 | BPB Limburg Open 2025 - C group |
Finished |
| 2024-12-26 to 2024-12-30 | Chessfestival Groningen 2024 Compact B |
Finished |
| 2024-05-17 to 2024-05-20 | 16th BPB Limburg Open B |
Finished |
| 2023-03-30 to 2023-03-31 | LIVE-Games under http://live.chess.at/ (Fr 17:00, Sa 15:00, So 10:00)  |
Finished |
| 2022-12-26 to 2022-12-30 | Chessfestival Groningen Compact A |
Finished |
| 2019-08-17 to 2019-08-24 | Vienna Chess Open 2019 Group A  |
Finished |
| 2018-07-11 to 2018-07-11 | Team-Blitz at WTC 50+, 65+ 2018  |
Finished |
| 2018-07-07 to 2018-07-15 | World Team Championship 50+ 2018 |
Finished |
| 2013-08-17 to 2013-08-25 | Vienna Chess Open 2013 A-Turnier (A-Tournament) |
Finished |
| 2008-06-29 to 2008-07-06 | OPEN DURAS BVK FIDE  |
Finished |
| 2005-06-19 to 2005-06-26 | 19 th INTERNATIONAL TOURNAMENT OPEN PULA 2005 |
Finished |
| Date | Players & Opening | Result | ECO | View |
|---|---|---|---|---|
| No results | No results | No results | No results | No results |
| Date | Players & Opening | Result | ECO | View |
|---|---|---|---|---|
| 2023.08.05 | Dauner,Benedikt (2377) vs (1834) Koelmans,J 10th Arber Open 2023 Queen's Pawn Zukertort - London |
1-0 | D02 | |
| 2017.07.30 | Dgebuadze, A. (2524) vs (1916) Koelmans, J. Pays de Charleroi Open Sicilian - Keres |
1-0 | B20 | |
| 2013.07.08 | Koelmans, J. (2007) vs (2177) Van Osch, Mees 3rd SPAChess Open Benko Gambit Accepted - Half-Accepted |
0-1 | A58 | |
| 2010.07.10 | Lobzhanidze, D. (2513) vs (2034) Koelmans, J. 1st Open Sicilian Scheveningen Najdorf - Byrne |
1-0 | B90 | |
| 2009.08.07 | Koelmans, J. (2008) vs (2173) Admiraal, M. HZ Open Modern Benoni King's Pawn |
0-1 | A65 | |
| 2009.08.06 | Stange, S. (2130) vs (2008) Koelmans, J. HZ Open Semi-Slav |
1/2-1/2 | D43 | |
| 2009.08.05 | Koelmans, J. (2008) vs (2156) Riemens, A. HZ Open Modern Averbakh |
1/2-1/2 | A42 | |
| 2009.08.04 | Van der Linde, Ma (2171) vs (2008) Koelmans, J. HZ Open Sicilian Open - Prins |
1/2-1/2 | B55 | |
| 2009.08.03 | Koelmans, J. (2008) vs (2165) Smits, S. HZ Open King's Indian Schwarz |
1/2-1/2 | E70 | |
| 2009.08.02 | Vroombout, E. (2190) vs (2008) Koelmans, J. HZ Open Sicilian Scheveningen Najdorf - Byrne |
1/2-1/2 | B90 | |
| 2009.08.02 | Koelmans, J. (2008) vs (2205) Dek, L. HZ Open Modern |
1/2-1/2 | A41 | |
| 2002.06.15 | Valenti, R. (2152) vs Koelmans, Jan Wille Open Sicilian |
1/2-1/2 | B50 | |
| 2002.06.13 | Cedikova, K. (2168) vs Koelmans, Jan Wille Open Slav Dutch |
1-0 | D19 | |
| 2002.06.11 | Dickhoff, R. (2230) vs Koelmans, Jan Wille Open Slav Czech - Krause |
1-0 | D17 | |
| 2002.06.08 | Drazic, S. (2474) vs Koelmans, Jan Wille Open Nimzovich - Modern |
1-0 | A01 | |
| 2007.10.28 | Koelmans, J. (2008) vs (2103) Schrott, E. Open A Benko Gambit |
1/2-1/2 | A57 | |
| 2007.10.27 | Picone, F. (1864) vs (2008) Koelmans, J. Open A Queen's Pawn - Mason |
0-1 | D00 | |
| 2007.10.26 | Schaefer, Mi1 (2247) vs (2008) Koelmans, J. Open A Slav Two Knights - Geller-Tolush |
1-0 | D15 | |
| 2007.10.25 | Koelmans, J. (2008) vs (2170) Nicholson, JG. Open A King's Indian Yugoslav (Aronin) - Normal |
0-1 | E98 | |
| 2007.10.24 | Koelmans, J. (2008) vs (2100) Cardili, M. Open A Slav Dutch |
1-0 | D18 | |
| 2007.10.23 | Isonzo, D. (2339) vs (2008) Koelmans, J. Open A Sicilian Scheveningen Najdorf - Byrne |
1-0 | B90 | |
| 2007.10.22 | Koelmans, J. (2008) vs (2145) La Manna, A. Open A Dutch Indian - Semi-Leningrad |
1-0 | A81 | |
| 2007.10.21 | Giaracuni, C. (1759) vs (2008) Koelmans, J. Open A Queen's Pawn Richter-Veresov - Chigorin |
0-1 | D01 | |
| 2007.10.20 | Koelmans, J. (2008) vs Collato, Luca Open A Dutch Indian - Semi-Leningrad |
1/2-1/2 | A81 |
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