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RE: Is Berlin the fastest marathon course out there? Could Kipchoge have run faster today on a different record eligible course?
Dubai is the fastest course layout with few turns and perfectly flat. But Dubai is generally just too warm and humid. It can also be smoggy. It is pretty rare to get the lows down under 60 deg in January. They have to start before the sun comes up to keep conditions manageable.
Also, I think Kipchoge is a bit of a showman and feeds off of the crowds. There are almost no spectators on the course in Dubai, except for the grandstands at the finish that are mostly filled with Ethiopian ex-pats.
Frankfurt and Chicago are very fast courses. The weather in Chicago just isn't reliable for WR attempts. If it isn't hot it is windy. Frankfurt is in late October and has conditions that are usually as good as Berlin but seem to get a little more rain/wind as they are later in the fall. So, if all the money went to one race for a WR attempt, Frankfurt might arguably be slightly better than Berlin.
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