ROJO I am just the messenger here:
Agree the WA tables don't reflect the effort, but...
Go to Runnerspace.com, then "Tools", then Performance predictor and enter his 61:01 half time. Two of the four predictions are very close and the other two now far off. And even the average of the four is 2:08
Pete Riegel's is the closest at 2:07:12 Here is a quote from the explanation/credits page from this calculator:
"Pete Riegel's Model: t2 = t1 * (d2 / d1)^1.06
where t1 equals the initial time, d1 equals the initial distance, d2 equals the new distance being calculated for, and t2 equals the predicted time for the new distance.
The formula was developed by Pete Riegel and published first in a slightly different form in Runner's World, August 1977, in an article in that issue entitled "Time Predicting." The formula was refined for other sports (swimming, bicycling, walking) in an article "Athletic Records and Human Endurance," also written by Pete Riegel, which appeared in American Scientist, May-June 1981."
IMHO this is an excellent prediction calculator. I have used it for several year. It is often so accurate, that there have been times after racing hard after a 10 milers (Flint Crim) or Half Marathons (USATF Masters championships), that boggles my mind; < 00:00:10 off.
Link:
Great site and very useful tool - kudos to them to making this calculator public and free!