I really don't think there is a best one.
Best opening?
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well, its you're opinion.
The ruy is probably the best. It gives white a slight advantage even with perfect play from black. White can still play for the win too.
English Defence is golden.
Jun 20, 2009
0
#6
Don't think it is really this important as I'm blundering anyway. At the lvl of most average player openings don't matter for this cause 
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English , CK, Leningrader here.
I like them all.
To me openings are a way of keeping chess interesting.
If I played the same opening every game I would get bored.
All the Chess Gods played many different openings and I do the same.
The only difference between me and them is they were great chess players.
And isn't getting good the easy part?
What do you think is the best opening? I personally like the four knights