This will explain it.
We get the green light then go and first one to the end wins.
That is heads up racing.
If you are bracket racing you dial in an ET and run as close to that without going over.
Racing the clock is not what I do on grudge night. yea his is faster but my finish light came on first.
Video explains it best.
And the grand national I raced ..look at his lights at the end they came on first. he won.