Depends on your style. Even weak computer never overlooks simple tactics. If you are good positional player not TOO prone to tactical mistakes you have good chance to beat a weak computer.
Why can't I beat somewhat stronger computer?
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My rating here is around 1400. Computer rating that I play against here is 1600. Difference of 200 is quite a lot. But shouldn't I be able to win at least a few of the games? I played many games but I can't win even once.