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King [https://en.wikipedia.org/wiki/Tropism tropism] is a simplified form of king safety evaluation. It takes into account the [[Distance|distance]] between the King and the attacking pieces, possibly weighted against [[Point Value|piece value]]. For example, one may double the distance value for a queen, and halve it for bishops and rooks. This kind of evaluation acts in a probabilistic way - it is by no means certain that being close to the king helps in attacking it. For example, if white castles short, black rook on h8 gets a higher tropism value regardless whether it stands on an open file. Nevertheless, using this kind of crude evaluation term increases a probability of building up an attack.
This kind of algorithm is used by [[Crafty]]. Another, perhaps more basic example is the [[CPW-engineEngine]] as implemented in [[CPW-Engine_eval]], and the one demonstrated in the [[Evaluation Function Draft]].
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