trust problem

[cecilia hana]

hello,

im a Gnupg beginner, in Gnupg user guide i know how to
use trust to validate keys.
It has two conditions 1 and 2, i understand the first
but i don't understand the second,
following is the second condition:

2. the path of signed keys leading from K back to your
own key is five steps or shorter.

                                                      
            
peter------->blake------->elena------->chloe------->alex------->simon------->K
    

above figure shows that peter signed blake and blake
signed elena then on and on,
if peter just fully trusts simon, i think K's key is
valid, however K is beyond the range of five steps,
can anyone tell me why and i want more clearly
nderstanding
about the second condition, thanks.

cecilia

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