| Athletes |
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Biographical data for: Tjerk DE BOER
| Classifications in season 2009/2010: |
| 10/10/09 | Turnhout BEL | Opening Games | Boys Junior E | | Overall Ranking: 1st, 222 meter: 1st, 333 meter: 1st | | 13/12/09 | Enschede NED | Twente Bokaal | Jongens Pupillen 1 | | Overall Ranking: 8th, 500 meter: 9th, 777 meter: 6th | | 17/01/10 | Enschede NED | Regio Noord-Oost 3 | Pupillen 1 | | Overall Ranking: 3rd, 500 meter: 3rd | | 12/02/10 | Leeuwarden NED | StarClass-5 (ABCNS-3) - Friesland Cup | Boys Novice | | Overall Ranking: 5th, 500 meter: 8th, 777 meter: 4th | | 20/02/10 | Groningen NED | Finale Regiocompetitie NoordOost | Pupillen 1 | | Overall Ranking: 1st, 500 meter: 1st | | 03/04/10 | Gent BEL | Easter Tournement 30th - Golden Sun Award | Boys Junior E | | Overall Ranking: 6th, 222 meter: 6th, 333 meter: 4th | | 10/04/10 | Amsterdam NED | Open Dutch Juniors | Boys Junior E/F | | Overall Ranking: 1st, 333 meter: 1st, 500 meter: 1st, 800 meter: 1st | | 17/04/10 | Turnhout BEL | Closing Games | Boys Junior E | | Overall Ranking: 5th, 222 meter: 2nd, 333 meter: 6th |
| Results in season 2009/2010: |
| 222 meter |
| 24 | .370 | 17/04/10 | Turnhout BEL | Closing Games | Final | |
| 24 | .510 | 17/04/10 | Turnhout BEL | Closing Games | Heats | |
| 25 | .593 | 04/04/10 | Gent BEL | Easter Tournement 30th - Golden Sun Award | Heats, Group 1 | |
| 25 | .681 | 04/04/10 | Gent BEL | Easter Tournement 30th - Golden Sun Award | Final, Group 2 | |
| 25 | .84 | 10/10/09 | Turnhout BEL | Opening Games | Final | |
| 25 | .85 | 10/10/09 | Turnhout BEL | Opening Games | Heats | |
| 52 | .069 | 04/04/10 | Gent BEL | Easter Tournement 30th - Golden Sun Award | Semi Final, Group 1 | |
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| 333 meter |
| 35 | .988 | 11/04/10 | Amsterdam NED | Open Dutch Juniors | Final, Group 1 | |
| 36 | .290 | 17/04/10 | Turnhout BEL | Closing Games | Heats | |
| 36 | .415 | 03/04/10 | Gent BEL | Easter Tournement 30th - Golden Sun Award | Semi Final, Group 1 | |
| 36 | .61 | 20/03/10 | Leiden NED | Arie Ravensbergen Bokaal | Heats, Groep 1 | |
| 36 | .681 | 10/04/10 | Amsterdam NED | Open Dutch Juniors | Heats, Group 1 | |
| 36 | .944 | 11/04/10 | Amsterdam NED | Open Dutch Juniors | Semi Finals, Group 1 | |
| 37 | .272 | 03/04/10 | Gent BEL | Easter Tournement 30th - Golden Sun Award | Heats, Group 1 | |
| 37 | .44 | 10/10/09 | Turnhout BEL | Opening Games | Final | |
| 37 | .51 | 10/10/09 | Turnhout BEL | Opening Games | Heats | |
| 1:25 | .790 | 03/04/10 | Gent BEL | Easter Tournement 30th - Golden Sun Award | Final, Group 1 | |
| DQ | 17/04/10 | Turnhout BEL | Closing Games | Final | |
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| 444 meter |
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| 500 meter |
| 51 | .805 | 14/02/10 | Leeuwarden NED | StarClass-5 (ABCNS-3) - Friesland Cup | Semi Final, Group 1 | |
| 51 | .85 | 20/02/10 | Groningen NED | Finale Regiocompetitie NoordOost | Finale, Groep 1 | |
| 52 | .22 | 20/02/10 | Groningen NED | Finale Regiocompetitie NoordOost | Halve Finales, Groep 1 | |
| 52 | .851 | 13/02/10 | Leeuwarden NED | StarClass-5 (ABCNS-3) - Friesland Cup | Quarter Finals, Group 1 | |
| 53 | .04 | 17/01/10 | Enschede NED | Regio Noord-Oost 3 | Finale, Groep 1 | |
| 53 | .70 | 20/02/10 | Groningen NED | Finale Regiocompetitie NoordOost | Kwart Finales, Groep 1 | |
| 53 | .89 | 17/01/10 | Enschede NED | Regio Noord-Oost 3 | Halve Finale, Groep 1 | |
| 53 | .995 | 13/02/10 | Leeuwarden NED | StarClass-5 (ABCNS-3) - Friesland Cup | Heats, Group 1 | |
| 54 | .559 | 10/04/10 | Amsterdam NED | Open Dutch Juniors | Semi Finals, Group 1 | |
| 54 | .62 | 20/02/10 | Groningen NED | Finale Regiocompetitie NoordOost | Heats, Groep 1 | |
| 54 | .64 | 17/01/10 | Enschede NED | Regio Noord-Oost 3 | Kwartfinale, Groep 1 | |
| 54 | .70 | 13/12/09 | Enschede NED | Twente Bokaal | Heats, Groep 1 | |
| 54 | .98 | 29/11/09 | Leeuwarden NED | Regio competitie Noord/Oost 2 | Heats, Groep 1 | |
| 55 | .41 | 17/01/10 | Enschede NED | Regio Noord-Oost 3 | Heats, Groep 1 | |
| 55 | .69 | 13/12/09 | Enschede NED | Twente Bokaal | Halve Finale, Groep 2 | |
| 55 | .81 | 13/12/09 | Enschede NED | Twente Bokaal | Finale, Groep 3 | |
| 55 | .859 | 10/04/10 | Amsterdam NED | Open Dutch Juniors | Final, Group 1 | |
| 55 | .859 | 10/04/10 | Amsterdam NED | Open Dutch Juniors | Heats, Group 1 | |
| 1:01 | .66 | 20/03/10 | Leiden NED | Arie Ravensbergen Bokaal | Finale, Groep 1 | |
| 1:32 | .27 | 13/12/09 | Enschede NED | Twente Bokaal | Kwart Finale, Groep 1 | |
| DQ | 14/02/10 | Leeuwarden NED | StarClass-5 (ABCNS-3) - Friesland Cup | Final, Group 2 | |
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| 777 meter |
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| 800 meter |
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| 2000 meter relay |
| 3:30 | .93 | 20/03/10 | Leiden NED | Arie Ravensbergen Bokaal | Finale, Groep 1 | |
| (TRL: Tjerk de Boer, Bram de Jong, Siebren Tiemersma) |
| 3:34 | .39 | 17/01/10 | Enschede NED | Regio Noord-Oost 3 | Finale, Groep 1 | |
| (Trias Tijgers 3: Tjerk de Boer, Manon de Boer, Bram de Jong, Tineke den Dulk) |
| 3:35 | .44 | 13/12/09 | Enschede NED | Twente Bokaal | Finale, Groep 1 | |
| (TRL-1: Tjerk de Boer, Bram de Jong, Tineke den Dulk, Siebren Tiemersma) |
| 3:37 | .27 | 29/11/09 | Leeuwarden NED | Regio competitie Noord/Oost 2 | Finale, Groep 1 | |
| (TRL: Tjerk de Boer, Bram de Jong, Tineke den Dulk, Siebren Tiemersma) |
| 3:44 | .215 | 11/04/10 | Amsterdam NED | Open Dutch Juniors | Final, Group 1 | |
| (Trias Leeuwarden: Jelle de Boer, Tjerk de Boer, Bram de Jong, Siebren Tiemersma) |
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| 3000 meter relay |
| 5:18 | .94 | 20/02/10 | Groningen NED | Finale Regiocompetitie NoordOost | Heats, Groep 1 | |
| (TRL2: Tjerk de Boer, Jelle de Boer, Bram de Jong, Siebren Tiemersma) |
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