How many knots do you really need to know?

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Pull a half in rope on a big tree with a truck using a Bowline and I bet it will break at the Bowline . Not saying a Bowline isn't great I use them every day at work.

Using a truck to pull a tree with 1/2" sounds like a bad idea right from the start.

But did the rope break at the bowline or did the bowline fail?
 
As soon as you make a loop around something or the rope itself by making a knot you loose strength. These are some numbers I found.
Knot Strength

NO Knot 100%
Bowline 70-75%
Water Knot 60-70%
Figure 8 75-80%
Clove Hitch 60-65%
Overhand 60-65%
Sheat bend 48-58%
Square 38%
 

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