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What is the difference between thickness and heavy stones?

Many beginners and even advanced players have difficulties telling apart thick from heavy or over-concentrated groups. How are these terms defined, and how can I quickly decide if a result in a certain position is good or bad for me based on that?

Is influence the same as thickness, or is there a difference?

merged by mafu Feb 9 '12 at 15:09

This question was merged with What is the difference between thickness and heavy stones? because it is an exact duplicate of that question.

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