Turn By
This is basically a Single Trade By. The outsides always turn to the right.
\pvfour{b2n,g2s,b1n,g1s} | \pvfour{b2s,b1n,g2s,g1n} |
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before Turn By | after |
Well, not really. It's actually a Single Eight Chain or Single Trade By,
as needed. This allows for such things as this extremely common usage:
\pvfour{g2s,b2n,g1s,b1n} | \pvdiamond{b2e,g2s,g1w,b1n} |
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before Turn By 1-1/2 | after |