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'''[[Main Page|Home]] * [[Chess]] * [[Squares]] * Occupancy'''
[[FILE:ZappaBesetzt20160916.JPG|border|right|thumb|Occupied <ref>[https://de-de.facebook.com/umspannwerk.recklinghausen/posts/10153757793891429 Besetzt!] (Occupied) - [https://en.wikipedia.org/wiki/Toilet Toilet] exhibition at [https://de.wikipedia.org/wiki/Umspannwerk_Recklinghausen Umspannwerk Recklinghausen], today [https://en.wikipedia.org/wiki/RWE RWE] [https://en.wikipedia.org/wiki/Technology_museum Technology museum] in [https://en.wikipedia.org/wiki/Recklinghausen Recklinghausen], Germany, and part of [[:Category:Industrial Heritag Heritage Trail|The Industrial Heritage Trail]] of the [https://en.wikipedia.org/wiki/Ruhr Ruhr area] - [https://en.wikipedia.org/wiki/Toilet#Others Portable toilet] labeled Rock:Klo with [[Videos#FrankZappa:Category:Frank Zappa|Frank Zappa]] [http://wiki.killuglyradio.com/wiki/The_Toilet_Poster Toilet Poster] inside, Photo by [[Gerd Isenberg]], September 16, 2016</ref> ]]
The '''Occupancy''' refers to the boolean property of a square. It is occupied if any [[Pieces|piece]] exclusively resides on that square, otherwise the square is empty. In [[Bitboards|bitboards]], the occupancy or ''occupied bitboard'' refers the set of all squares occupied by any piece. Thus, it is the [[General Setwise Operations#Union|union]] of all [[Bitboard Board-Definition|piece bitboards]], which is used for instance in calculating [[Sliding Piece Attacks|sliding piece attacks]]. Likely, while the piece bitboards are [[Incremental Updates|updated incrementally]], the occupancy is updated incrementally as well, rather than calculated from up to 12 piece bitboards each time.
'''[[Squares|Up one Level]]'''
[[Category:Industrial Heritag Heritage Trail]][[Category:Frank Zappa]]
