Here's the River's Inlet Knot (a.k.a. a double clinch knot) shown step-by-step as tied on the following web page: http://www.steelheader.net/knots/double_clinch.htm
When properly tied and trimmed you'll have three tag ends. If I'm splitshoting...I'll put it on one of the tag ends and if the shot hangs up in the rocks...it just pulls off and leaves my leader to drift free.
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See ya on the River!