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ChessBase and Chess Assistant have functions to show you in what lines your future opponent scores well and in what lines he scores badly. It is very easy to be tempted to play a line in which your opponent has not done well. However, it is also quite dangerous. If you know nothing about the line, you will be in dire straits if your opponent deviates at a point where you did not expect it. Christian Kongsted, How To Use Computers To Improve Your Chess