Depends on the cord. A good jacketed polyester braided cord works better for almost any knot (especially friction knots) compared to Zing-it, Amsteel etc.
I've had excellent results with Midshimpman's (variation of tautline), Grip hitch, Farrimond and anything else imaginable using Lawson Glowire and Guywire with very few wraps. Farrimond is really nice because it is an 'exploding' hitch when released... zero reeving (feeding line thru loops).
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