When I wrote charts at a greyhound park, the lengths behind the winner was calculated at the wire. If the winner won in 30.00 seconds, and the second place finisher finished in 30.14, he would be listed as 2 lengths behind (.07 seconds = one length). A runner that was 8th when the winner crossed, but passed two tiring rivals in the stretch after the winner crossed would be listed as 6th with his lengths behind calculated at the wire based upon his finishing time. So he/she could be 20 lengths behind the winner when the winner crosses the line, but make up some time late and be listed as 18 lengths behind.
I would think it is the same for thoroughbreds.
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