Boris Tannenbaum
ID 469370
Born : 1955 Cat. M70 Ultrarunner since 2013 USA
39
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
40
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?USAUnited States
79,2%
Rank quotient ?This runner's calculation uses 39 eligible race(s): Σ(rank − 1) = 2 399; Σ finishers = 3 029. 2 399 / 3 029 × 100 = 79.20%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed39
Km — ultra races2 024 km
Longest race100,0 km
5th The Great New York 100 km Running Exposition — 18/6/2016

Km per year (ultra races)

100
2 races
2022
200
4 races
2023
50
1 race
2024
2025
2026

Race types (share of distance)

Road39,3%
Trail60,7%

Records

50 km5h41'13100 km19h22'2750 mi14h18'45

HISTORY

39 race(s)
DateRacePerf.Rk
2024
27.01 50km USA3rd Snowbird Challenge 7:15:00 h60
2023
02.12 50km USA2nd Arctic Frog 50 km Run 8:03:00 h49
11.11 50km USA11th Paleozoic Trail Runs - Ordovician Fall 50K 8:23:16 h70
28.10 50km USA24th Chicago Lakefront Fall 50km Race 7:42:56 h87
25.03 50km USA24th Chicago Lakefront Spring 50km Race 8:15:45 h54
2022
29.10 50km USA23th Chicago Lakefront Fall 50km Race 7:39:24 h81
26.03 50km USA23th Chicago Lakefront Spring 50km Race 8:15:46 h54
2021
31.10 50km USA22th Chicago Lakefront Fall 50km Race 7:52:14 h92
27.03 50km USA22nd Chicago Lakefront Spring 50km Race 7:48:57 h70
2019
24.08 8h USA3rd Terra Sans Pave - Terathlon 8-Hour 48.478 km15
27.07 50km USA5th Hot Hilly Hairy Ultra 50 km 9:21:06 h14
20.04 50km USA8th Earth Day 50k 9:00:34 h149
2018
10.11 50km USA6th Paleozoic Trail Runs - Ordovician Fall 50K 7:07:53 h41
27.10 50km USA19th Chicago Lakefront Fall 50km Race 6:26:02 h76
09.09 50km USA15th Rock Cut Hobo 50K 8:06:04 h55
08.09 8h USA2nd Terra Sans Pave - Terathlon 8-Hour 48.280 km13
28.07 50km USA4th Hot Hilly Hairy Ultra 50 km 8:11:39 h24
24.03 50km USA6th Paleozoic Trail Runs - Silurian Spring 50K 7:06:56 h48
2017
08.10 50km USA31st Glacial Trail 50 km Race 9:39:46 h106
07.10 30mi USA12th Farmdale Trail Run 30 Mile 9:07:44 h35
09.09 8h USA1st Terra Sans Pave - Terathlon 8-Hour 48.280 km10
29.07 50km USA3rd Hot Hilly Hairy Ultra 50 km 7:08:42 h22
08.04 50km USA18th Chicago Lakefront Spring 50km Race 6:26:40 h80
2016
03.12 50km USA3rd Arctic Frog 50 km Race 5:55:25 h47
12.11 50km USA4th Paleozoic Trail Runs - Permian Fall 50K 6:26:57 h51
28.07 50km USA2nd Hot Hilly Hairy Ultra 50 km 7:54:39 h38
18.06 100km USA5th The Great New York 100 km Running Exposition 19:22:27 h32
30.04 50mi USA4th Indiana Trail 50 Mile 14:18:45 h106
26.03 50km USA4th Paleozoic Trail Runs - Silurian Spring 50K 6:36:14 h46
2015
05.12 50km USA2nd Arctic Frog 50 km Race 6:36:12 h81
14.11 50km USA3rd Paleozoic Trail Runs - Permian Fall 50K 6:29:05 h41
31.10 50km USA16th Chicago Lakefront Fall 50km Race 5:54:30 h77
2014
20.12 50km USA18th Huff 50K Trail Run 7:30:26 h270
06.12 50km USA1st Arctic Frog 50 km Race 6:18:14 h40
01.11 50km USA15th Chicago Lakefront Fall 50km Race 5:52:42 h73
05.04 50km USA15th Chicago Lakefront Spring 50km Race 5:44:47 h86
22.03 50km USA2nd Paleozoic Trail Runs - Carboniferous Spring 50K 7:22:59 h37
2013
16.11 50km USA1st Paleozoic Trail Runs - Carboniferous Fall 50K 6:04:01 h16
02.11 50km USA14th Chicago Lakefront Fall 50km Race 5:41:13 h92