position has 11 white pieces and nine black pieces, the simplest evaluation function might be: 11 - 9 = 2 Obviously, for chess that formula is way too simple, because some pieces are more valuable than others. So the formula might apply a weight to each type of piece. As the programmer thinks about it, he or she makes the evaluation function more and more complicated by adding things like board Vienna best isp, Vienna, MD isp best ViennaVienna isp, best Maryland, Vienna best isp
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