| Event | 2012 Snowdonia - Marathon |
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| Name | Dewi Williams | Club | Eryri Harriers | Race Number | 1765 | Date | 27/10/2012 |
| Gender | Male | Gender Position | DNF of 1212 | Category | MOPEN | Category Position | DNF of 499 |
| Half Marathon | 01:43:08 | Stage Position | 320 |
| Gun Time | DNF | Overall Position | DNF |
| Chip Time | DNF | Chip Position | DNF |