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| The term pre-processing is normally used in the context of an evaluation function. It's a process where you make most of your evaluation decisions BEFORE the [[Search|search]] begins. Typically you determine where each piece should go and essentially build a 64 square table for each piece type of each color on the chess board. You might decide that the c file is [[Open fileFile|open]] and so you give rooks a big bonus if they can get to the c file. Once you make this decision it doesn't change during the search. So if the c file suddenly gets blocked during the search, the rooks won't know this and still try to get on the c file.
Pre-processing has many advantages and disadvantages. Here is a list of them:

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