In go, good move stretches as far as possible, but not further. Moving too far away from your group is just as bad as moving too close. If both players follow the flow of the game, neither can expect to crush the other, the game is symmetric. This is why you just take the board position and see how the game should flow from there. If your opponent is weak, he loses much because his moves don't accomplish enough, and maybe even actively defeat each other. You can't do anything but avoid falling prey for that same thing, making each of your move count as much as possible, being as sharp as possible.

It's easiest to win against those players who have something like intention to kill. When they stretch further than they actually could, you can just lazily defend yourself. Defending is much easier than attacking in go. After a while, opponent has overstretched formations around the board, and you can start retaliating with no noticeable weaknesses, making the game totally one-sided. You just can't do better than playing the sharpest move possible. If opponent answers well, the result is even, but that's just how the game is.