• Careful design of the move generator so that equivalent structures are not generated again:
  CH3-CH2- vs. -CH2-CH3
• Rules that detect particular substructures in the mass spectrogram predict some parts of the molecular structure; these parts are put on a GOODLIST and are generated first.
  Rule: M-44 is a high peak, and 44 is a high peak
  Prediction: aldehyde:

  
      O
    | |
   -C-C-H
    |
  

• A BADLIST contains substructures which are unstable or could not be present because their signatures do not appear in the mass spectrogram: H-C-N=O, O-O, S-S-S are forbidden substructures because they are unstable. Any move which results in a BADLIST substructure is immediately detected and eliminated, pruning the whole search tree below that node.

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