| Athletes |
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Biographical data for: Siebren TIEMERSMA
| Classifications in season 2011/2012: |
| 22/10/11 | Groningen NED | Autumn Tournament | Boys Junior C | | Overall Ranking: 4th, 500 meter: 2nd, 1000 meter: 4th, 1500 meter: 3rd | | 28/10/11 | Malmö SWE | StarClass 2 (NC) | Men Junior C | | Overall Ranking: 21st, 500 meter: 16th, 1000 meter: 38th, 1500 meter: 16th | | 13/11/11 | Amsterdam NED | KNSB Cup 1 - Jaap Edentrofee | Divisie B | | Overall Ranking: 4th, 1000 meter: 4th |
| Results in season 2011/2012: |
| 500 meter |
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| 1000 meter |
| 1:42 | .073 | 22/10/11 | Groningen NED | Autumn Tournament | Semi Final, Group 1 | |
| 1:42 | .340 | 28/10/11 | Malmö SWE | StarClass 2 (NC) | Quarter Finals, Group 1 | |
| 1:42 | .496 | 28/10/11 | Malmö SWE | StarClass 2 (NC) | Semi Final, Group 2 | |
| 1:43 | .197 | 13/11/11 | Amsterdam NED | KNSB Cup 1 - Jaap Edentrofee | Heats, Groep 1 | |
| 1:43 | .877 | 28/10/11 | Malmö SWE | StarClass 2 (NC) | Heats, Group 1 | |
| 1:44 | .363 | 13/11/11 | Amsterdam NED | KNSB Cup 1 - Jaap Edentrofee | Halve Finale, Groep 1 | |
| 1:45 | .860 | 22/10/11 | Groningen NED | Autumn Tournament | Heats, Group 1 | |
| 1:47 | .765 | 30/10/11 | Malmö SWE | StarClass 2 (NC) | Final, Group 10 | |
| 1:49 | .890 | 22/10/11 | Groningen NED | Autumn Tournament | Final, Group 1 | |
| 1:55 | .075 | 29/10/11 | Malmö SWE | StarClass 2 (NC) | Preliminaries, Group 1 | |
| 1:57 | .975 | 29/10/11 | Malmö SWE | StarClass 2 (NC) | Quarter Finals, Group 2 | |
| 1:59 | .786 | 13/11/11 | Amsterdam NED | KNSB Cup 1 - Jaap Edentrofee | Finale, Groep 1 | |
| 2:02 | .812 | 28/10/11 | Malmö SWE | StarClass 2 (NC) | Final, Group 3 | |
| P | 30/10/11 | Malmö SWE | StarClass 2 (NC) | Semi Final, Group 5 | |
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| 1500 meter |
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| 3000 meter relay |
| 4:48 | .410 | 22/10/11 | Groningen NED | Autumn Tournament | Final, Group 1 | |
| (Trias / GO: Leon Bloemhof, Bram de Jong, Tijmen Steunenberg, Siebren Tiemersma) |
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