Found what I posted below on the IAAF site. near the bottom, it says they added (!!) two extra laps to make sure they covered the right distance. Three points...if they used the Championchip (the way it sounds), why would this even be necessary; 2)does this make the new world record even more amazing, as it's really the new record for 100 miles + 800 meters; and 3)imagine getting to the finish line at Chicago or Boston and being told to go around the block 1 time just to make sure you really ran the full 26.2187 mile distance.
"The 150km mark was reached in 10:34:30 by Jalybin, breaking Don Ritchie's previous world mark of 10:36:42. At this point the race began in earnest, as both men strove for the prize on offer for any runner breaking Ritchie's 100 mile mark.
Kharitonov at this point was some four laps behind Jalybin but began running 6 minutes miles despite having run 93 miles/150km already, and Jalybin was struggling, looking pale and as if he would drop out.
Jalybin clung on to the lead until the end of the 402nd lap, a mere 135 metres from the finish. At that point Kharitonov passed by, pushing on to clock a new 100 Mile world best of 11:28:03. It was to take Denis Jalybin nearly two minutes to cover the last 135 metres, whereupon he collapsed. Jalybin also broke Don Ritchie's mark, recording 11:29:32.
The lap recording was done by electronic chip, with manual back up, but as a precaution under the organisers advice, Kharitonov ran an additional two laps."