I was wondering what kind of tactics training is better: working with puzzle book ("The Ultimate Chess Puzzle Book" by John Emms is my favorite) or training on a website like chesstempo.
I find that each one has its strong sides. Book examples are carefully selected and probably have higher instructional value. The problem is that when working with a book I don't have enough determination to calculate variations rigorously. Quite often it goes like "I almost got it right".
Chesstempo on another hand has zero tolerance and "almost" is not enough – you have to give winning exact line move by move, otherwise your rating goes down. And that makes me think just as hard as in real OTB game.