"Wisely and slow. They stumble that run fast." -- William Shakespeare, Romeo and Juliet.
* Combinations do not usually come out of nowhere - they are based on a superiority in position, and you can tell when a combination is likely to be around: 1. Exposed or "stalemated" Kings are always vulnerable 2. Undefended or 'hanging' pieces aften lead to trouble. 3. Pieces which are defended only as often as they are attacked can also lead to trouble, because their defenders are at least partly immobilised..