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This kind of algorithm is used by [[Crafty]]. Another, perhaps more basic example is the [[CPW-Engine]] as implemented in [[CPW-Engine_eval]], and the one demonstrated in the [[Evaluation Function Draft]].
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=Virtual Mobility=
Another heuristic is to temporary replace the king by a [[Queen|queen]], to use her virtual [[Mobility|mobility]] as a measure of opponent's [[Sliding Pieces|sliding piece]] attacking changes and therefore an unsafe king.
One may even temporary modify the [[Occupancy|occupancy]] to improve this virtual mobility, e.g by removing mobile opponent pieces.
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=Scaling=
