I need very strong, reliable at the same time trickiest most surprising defence against e4 as my first move as black , Classical time controls or rapid
Best, most complex, highly recommended, trickiest defence against .... !?


1...a6 If Miles used it to beat Karpov, then it is as good a surprise weapon as anything. And it's a sound opening.

Many transpositional possibilities, good way to play for a win.
But I wouldn't call it "reliable" since sometimes you're going to get squashed no matter how well you learn it.
I never play it. Good luck.
E4 !
Explain your choice