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Used to tie two ropes of equal thickness together.It is pretty easy to tie and untie but under tention,it may be diffcult to untie.It is also not sutible for smooth ropes.(eg.nylon ropes)
The reef knot is basically a parcel knot and likely to capsize under strain, i.e. it will turn into a cow hitch sliding along the line being heaved on. The preferred knot for anything being lifted overhead or supporting body weight would be some form of the sheet bend or becket bend regardless of the relative sizes of the line.
Never use a reef knot(square knot) for lines under strain.
Never use a reef knot(square knot) for lines under strain.