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}
2 2 1 1 2 1 2 1
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}
2 2 1 1 2 2 1 1
before Turn By 1-1/2 after