From a DPT: Centers Pass Thru and face in (Pass In), same four Pass Thru and face out (Pass Out); all then: 1) Pass Thru and face in (Pass In) for Chisel In; 2) Pass Thru and face out (Pass Out) for Chisel Out; 3) Outsides only Partner Trade for Chisel By.
Chisel By can also be done from a trade by formation (i.e. Centers Pass In and Pass Out as outsides Partner Trade).
This definition is from SCVSDA Note Service by Bill Davis.
It is provided here for informational and educational purposes only.