Discussion
What properties should a good evaluation function have?
Answer: C
The function is called at every leaf, so it must be cheap, and it must order positions in the same way their true values do, since only the ordering affects the move chosen. Exact values are unobtainable, searching within the evaluation confuses the two mechanisms, and three values would discard the distinctions the search needs. A requirement stated as a correlation rather than an equality is much easier to satisfy and is all that the algorithm actually depends on.
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