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'''Mailbox''', (Offset board representation <ref>[http://www.craftychess.com/hyatt/boardrep.html Chess board representations] by [[Robert Hyatt]]</ref>)
a square-centric board representation where the [[Pieces#PieceCoding|encoding]] of every [[Squares|square]] resides in a separately addressable [[Memory|memory]] element, usually an element of an [[Array|array]] for random access. The square number, or its [[Files|file]] and [[Ranks|rank]], acts like an address to a post box, which might be empty or may contain one chess piece. As pointed out by [[Harm Geert Muller]], not only the embedded [[10x12 Board|10x12 board]], but various implementations are all mailbox, independently from elements in the array for padding that can act as a [https://en.wikipedia.org/wiki/Sentinel_value sentinel value] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=48164 mailbox & CPW] by [[Harm Geert Muller]], [[CCC]], May 31, 2013</ref>.
=Pros & cons=
* Not efficient to generate moves in stages since generating all moves, captures only, non-captures may take quite similar periods
Implementations= * [[ 8x8 Board]] * [[ 10x12 Board]] * [[ Vector Attacks]] : [[ 0x88]]