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a sophisticated, commercial [[Windows]] [[GUI]] by [[ChessOK]], developed by [[Victor Zakharov]] and [[Vladimir Makhnychev]] <ref>[http://chessok.com/?page_id=27966 Lomonosov Endgame Tablebases - History Note] - [[ChessOK]]</ref>, supporting [[UCI]] and [[WinBoard]] engines. Aquarium is based on the fluent design as introduced by [[Microsoft]] [https://en.wikipedia.org/wiki/Microsoft_Office_2007 Office 2007], featuring a [https://en.wikipedia.org/wiki/Ribbon_%28computing%29 ribbon], which is a set of [https://en.wikipedia.org/wiki/Toolbar toolbars] placed on [https://en.wikipedia.org/wiki/Tab_%28GUI%29 tabs] <ref>[http://www.computerworld.com/s/article/9003994/Final_Review_The_Lowdown_on_Office_2007 Final Review: The Lowdown on Office 2007] by Richard Ericson, [[Computerworld]], October 11, 2006</ref> <ref>[http://www.exceluser.com/explore/surveys/ribbon/ribbon-survey-results.htm Excel 2007's Ribbon Hurts Productivity, Survey Shows] by [http://www.exceluser.com/contact/kyd.htm Charley Kyd], [http://www.exceluser.com/index.htm Excel User--Reports, analyses, charts, & formulas for business], May, 2009</ref>. Beside the ribbon, the main window is tiled by a navigation window with multiple [https://en.wikipedia.org/wiki/Paned_window panes] to switch modes and documents, and a bigger working area with various views on that documents, that is [[Databases|game databases]], generated game lists and move variation trees as result of database queries, and a single [[Chess Game|chess game]], optional with variation trees and [[Game Notation|notations]]. In game playing or analyzing mode, the working area is dominated by a board view associated with [https://en.wikipedia.org/wiki/Dock_%28computing%29 dockable] and [https://en.wikipedia.org/wiki/Stacking_window_manager stackable] notation-, multiple column tree-, header-, analysis- and information windows. First released as [https://en.wikipedia.org/wiki/Aquarium aquarium] for the [[Various Classifications#:Category:Fish|fish]] dubbed [[Rybka]], the Aquarium GUI is also bundled with [[Houdini]] <ref>[http://chessok.com/ ChessOK.com: Chess shop from the developers of Rybka 4 Aquarium]</ref>.