Split rings are great to learn to help climb out of a pattern from one round to another. If it calls for ring on rings. Later we will try and learn the split chain which also helps in a continuous thread method.
 
Here is a celtic bookmark with a row of split rings that I did. The original design is by Wally Sosa. If you want to see the pattern you can,
This should give you a little idea on how the splits work for the rings, if you should come across a pattern with them in it. This is just an example for rings coming off rings. Using two shuttles. Mark your shuttles if using all one color threads to help you remember which shuttle is 1 or 2, unless you have two different kinds of shuttles.

	Make your first ring in the usual manner with shuttle1 3ds -3ds - 3ds - 3ds cl rw Make your first half of the ring with sh 2 in the reverse order, so the ds are on the same  side, 3ds -3ds Take them off your fingers, and turn the work over on your fingers, so now your stitches just made are on the bottom.  Now some people do the other half on the bottom thread while still in the same position. I find this a bit easier to take it and turn it over. The green thread is actually on the bottom half of the wrapped thread. See next photo also for second half.
	Once turned  over, so your pinching the pink and first ring. Do the stitch's in normal order so they are on the right side. BUT do not make the flip. If you make the flip it will not close. Start making your second half of the ring with shuttle1  3ds - 3ds, cl rw. This is closed by pulling shuttle two thread.
	Turn again so you are starting with shuttle2 and do the first half of the next ring, turn and do the other half with shuttle1. DO NOT  make the flip on the second half again.
	This is how it would start to look as you build ring on ring. If using all one color you would have two shuttles wound the same color thread off the ball.