Changes

determines whether a [[Squares|square]] is [[Attacks|attacked ]] and/or defended by various or specific [[Pieces|pieces]]. So far, as elaborated in [[Pawn Pattern and Properties|pawn]]-, [[Knight Pattern|knight]]- and [[King Pattern|king pattern]], as well as [[Sliding Piece Attacks|sliding piece attacks]], we are able to generate all attacks and target-sets of all pieces, sufficient to [[Move Generation|generate]] all [[Pseudo-Legal Move|pseudo legal moves]]. It is often useful to generate [[Attacks|attacks]] '''to''' a certain square, or to look whether [[Moves|moves]] retrieved elsewhere are pseudo legal or [[Legal Move|legal]]. Some programs maintain [[Incremental Updates|incremental updated]] [[Attack and Defend Maps|attack tables]] for that purpose. The techniques proposed on this page are intended to use on the fly.