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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]] [[Sliding Piece Attacks|attacking changes ]] chances 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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