Editing Universal Chess Interface (section)

==Design==
By design, UCI assigns some tasks to the user interface (i.e., presentation layer) which have traditionally been handled by the engine (at the business layer) itself.{{citation needed|date=July 2016}}

Most notably, the [[opening book]] is usually expected to be handled by the [[User interface|UI]], by simply selecting moves to play until it is out of book, and only then starting up the engine for calculation in the resulting position. UCI does not specify any on-disk format for the opening book. Different UIs usually have their own proprietary formats.{{citation needed|date=July 2016}}

While the UI can also take responsibility for handling [[endgame tablebase]]s, this is arguably better handled in the engine itself, as having tablebase information can be useful for considering possible future positions.<ref>{{cite book|title=Chess Life|url=https://books.google.com/books?id=w2JLAAAAYAAJ|year=2003|publisher=United States Chess Federation}}</ref>

Stefan-Meyer Kahlen's UCI protocol in Shredder uses a variation of [[Algebraic notation (chess)#Long algebraic notation|long algebraic notation]] for moves. A "nullmove" from an engine to a GUI should be sent as 0000.<ref name="wbec_UCIp">{{Cite web| title = UCI protocol| work = www.wbec-ridderkerk.nl| access-date = 2018-06-14| url = http://www.wbec-ridderkerk.nl/html/UCIProtocol.html}}</ref>

;Examples:
*e2e4
*e7e5
*e1g1 (white short castling)
*e7e8q (for promotion)