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[[File:machackdisplay02.jpg|border|right|thumb| Mac Hack [[Lawrence J. Krakauer#DEC340|display]] <ref>[http://ljkrakauer.com/LJK/60s/resign.htm I resign] by [[Lawrence J. Krakauer]]</ref> <ref>[http://ljkrakauer.com/LJK/60s/chess1.htm Chess stories] by [[Lawrence J. Krakauer]]</ref> <ref>see also [http://projects.csail.mit.edu/video/history/aifilms/63-chess.mp4 63-chess.mp4] hosted by [https://www.csail.mit.edu/ MIT CSAIL]</ref>]]
'''Graphical User Interface''' (GUI),<br/>
a user interface where [https://en.wikipedia.org/wiki/Interaction interaction] between user and a (chess) program takes place. Opposed to the sequential nature of a pure text based [[CLI|command-line interface]], where a program prints its output and prompts for input, a [https://en.wikipedia.org/wiki/Graphical_user_interface graphical user interface] allows a more sophisticated, graphical presentation of the programs output, as well within its [https://en.wikipedia.org/wiki/Event-driven_architecture event-driven architecture] a more flexible user interaction not only by typing text commands, but using a [https://en.wikipedia.org/wiki/Pointing_device pointingdevice], a [https://en.wikipedia.org/wiki/Mouse_%28computing%29 mouse] or a pen or finger pointing on and touching a [https://en.wikipedia.org/wiki/Graphics_tablet graphics tablet] with its [https://en.wikipedia.org/wiki/Touchscreen touchscreen], for random and [https://en.wikipedia.org/wiki/Direct_manipulation direct manipulation] of graphical elements. A GUI dedicated to play chess typically has a graphical [[Chessboard|board]] and [[Chess Game|game]] representation, where the user may [[Entering Moves|enter moves]] by [https://en.wikipedia.org/wiki/Point-and-click clicking] and [https://en.wikipedia.org/wiki/Drag-and-drop dragging] a piece, quite similar to moving a piece on a "real" chess board.
* [[Banksia GUI]]
* [[Banksia GUI for iOS]]
* [[Caddell Chess]]
* [[Chess Academy]]
* [[Chess Assistant]]
* [[Fancy]]
* [[Fritz#FritzGUI|Fritz GUI]]
* [[Gavon]]
* [[Glaurung#GUI|Glaurung GUI]]
* [[glChess]]
<span id="NotationWindow"></span>
==Notation Window==
The notation window represents the [[Game Notation|game notation]] or score-sheet of the chess game, the [[Move List|list of moves]] of the game. It works like a multiple line [https://en.wikipedia.org/wiki/Text_box text box] or multiple column [https://en.wikipedia.org/wiki/Grid_view grid view] or [https://en.wikipedia.org/wiki/List_box list box] often scrollable and indicated by a vertical [https://en.wikipedia.org/wiki/Scrollbar scrollbar]. A [https://en.wikipedia.org/wiki/Cursor_%28computers%29 cursor] inside the notation window might be associated with a [[Ply|half-move index]] in the range from zero (before first half-move played, [[Initial Position|initial position]]), to N (after last half-move played, current game position), and determines the position displayed in the board window. If the game window has keyboard [https://en.wikipedia.org/wiki/Focus_%28computing%29 focus], it receives input of moves via move coordinates or [[Algebraic chess notationChess Notation|algebraic notation]].
==Information Windows==
Information windows are associated with an engine actually playing or analyzing a game. It displays [[Search|search]] information like [[Principal variationVariation|principal variations]] and associated [[Score|scores]], times and that like. It is often implemented as scrollable logging window, always appending text at top or bottom lines.
=Mobile GUIs=
Beware that writing a GUI is between 10 and 100 times more work than writing an engine.
=See also=
* [[Chess Game]]
* [[Chess Server]]
* [[CLI|Command Line Interface]]
* [[CPW-Engine_com]]
