Look at it like a machine learning problem. If you slavishly match the test set ...

msg on Feb 1, 2011 | parent | context | favorite | on: Google: Bing Is Cheating, Copying Our Search Resul...

Look at it like a machine learning problem. If you slavishly match the test set you are doing something called overfitting. Your performance on the rest of the web will decrease, because you inherit bias from the test set.