Brokestrand,
Let me see if I can explain it a couple of different ways. One of them might make more sense to you.
First, just to be clear, let's assume that you have six strands numbered 1-6 left to right.
First way:
Step 1 :Take strand #1 and go to the right under the next 4 strands: #2, #3, #4, and #5. Now go back to the left over two strands: #5 and #4. The numbers l-r are now 2,3,1,4,5,6.
Step 2: Take strand six and go to the left under four strands: #5, #4, #1, and #3. Now go back to the right over two strands: #3 and #1. The order should now be 2,3,1,6,4,5.
Step 3: Strand #2 right under four, back to the left over two.
Step 4: Strand #5 left under four, Back to the right over two.
Step 5: Strand #3 right under four, left over two
Step 6: Strand #4 left under four, right over two.
Start over with step one.
Second way.
Divide the strands so there are three in each hand. Take the outside strand in your left hand around the back and come up between the two outermost strands in your right hand(#5 and #6.) Add it back to the group in your left hand so that it is the inside strand. Now take the outside strand in your right hand around the back and bring it up between the two outermost strands in your left hand (#2 and #3). Add it back to the right hand group so that it is the inside strand. Repeat indefinately. All That changes are the numbers in parentheses, and they shouldn't matter after you get started.
Both of these should make the braid shown above with a herringbone front and a basketweave back. With a core it will be round. Coreless, the front will be flat and the back round.
I usually find that when I can't figure something out its because I get locked into a certain way of thinking, so I try to figure out different ways to look at things. Of course, it might just be that I'm stupid.
To me u4o2 does work, you just have to add some directions to it.(No offense meant, Horsehairbraider) When I was a kid Dad told me a four strand round braid was over 2 under 1. I never figured it out, and finally got him to show me how. Thats what I thought of when I saw the problem.
I hope this helps.
Tim