Usually it works like this.. Say the fastest time of the night is a 15.0..That 15.0 is the winning 1D time.

1D - 15.0 then you have to add 1/2 second split..15.0 is 1/2 faster than a 15.5..

The winning 2D time would have to be a 15.5 or so..it cannot be faster than a 15.5..

Then the 3D would have to be a 16.0.. It cannot be faster than a 16.0.. That's the 1 second "split".. 15.0 is one second faster than the 16.0..

Then the 4D would have to be a 16.5.. that 16.5 is two seconds off of the fastest time of the day.. that's the 2 second split..

So it would go

1D - 15.0

2D - 15.5

3D - 16.0

4D - 16.5

And so on and so forth.. Those are the "splits"

Here is another good example from another user.

1D = fastest time of the day

2D = fastest horse that is equal to or slower than the agreed-upon split (typically 1/2 second from the 1D time)

3D = fastest horse that is equal to or slower than the agreed-upon split (typically 1 second from the 1D time)

4D = fastest horse that is equal to or slower than the agreed-upon split (typically 2 seconds from the 1D time)

Read more:

PLS explain the 1-D 2-D 3-D 4-D
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Here is a link to an actual show results sheet..You can look over the results and see the "splits" and get a feel for what I'm talking about.

http://www.southeasternarena.com/pdf...02-25-2012.pdf