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| Player: Justin Koopman |  |
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| Participant in the following teamtournaments: | Score * | ||||
| Youthtournament North/South Holland KNDB 2022 | 15 | - | 30 | D | |
| Dutch Teamcompetition KNDB 2022/2023 | 9 | - | 7 | D | F |
| Youth meeting DCIJ - HDC Noord-Holland 2022 | 6 | - | 12 | D | |
| Dutch Teamcompetition KNDB 2021/2022 | 9 | - | 8 | D | F |
| Dutch Teamcompetition KNDB 2020/2021 | 1 | - | 0 | D | F |
| Dutch Teamcompetition KNDB 2019/2020 | 9 | - | 5 | D | F |
| Zilveren Ooievaar Toernooi Zuid-Holland 2019 | 3 | - | 3 | D | F |
| NK Sneldammen Jeugdteams KNDB 2019 | 8 | - | 3 | D | F |
| National Youth-Draughts-Day KNDB 2018 | 10 | - | 10 | D | F |
| Dutch Teamcompetition KNDB 2018/2019 | 11 | - | 5 | D | F |
| Nationale Jeugddamdag KNDB 2017 | 7 | - | 4 | D | F |
| Total score: | 88 | - | 87 | ||
| * Scores based on registrated games in Toernooibase | |||||