Fortress+(Engine)

a Chess Engine Communication Protocol compliant chess engine written by Alessandro Damiani in C, first released in October 1998. Fortress pioneered in Rotated Indices, a deconcentrated version of rotated bitboards. Alessandro once mentioned improving a version of Schrüfer's "most selective" quiescence search, found in Schrüfer's Ph.D. thesis //Minimax-Suchen//. || toc =Technical Details=
 * Home * Engines * Fortress**
 * [[image:Buhen3.jpg link="http://en.wikipedia.org/wiki/File:Buhen3.jpg"]] ||~ || **Fortress**,
 * Buhen fortress ||~ ||^ ||
 * Based on bitboards (not the same rotated bitboards as in Crafty)
 * Search algorithm is Fail-Soft Alpha-Beta
 * Iterative Deepening
 * Iterative Aspiration Window
 * Null Move Pruning
 * Search extensions (checks, promotion threats, piece threats)
 * Transposition table
 * Killer Heuristic
 * History Heuristic
 * Static evaluation: important information is calculated incrementally (e.g. passed pawns).

=See also=
 * Fortress (Chess term)
 * Gk
 * Rotated Indices
 * Stonewall
 * Ziggurat

=Forum Posts=
 * [|futility cut-offs] by Alessandro Damiani, rgcc, November 14, 1997
 * [|New Version: FORTRESS V1.5, the new Morphy?] by Alessandro Damiani, CCC, January 15, 1999
 * [|Re: Home page for Fortress! ToDo: Opening book, ...] by Alessandro Damiani, CCC, September 09, 1999
 * [|Fortress 1.62 is available !] by Frank Quisinsky, Winboard Forum, May 22, 2000
 * [|Fortress 1.62 and Draw by 50 moves rule ?] by Brice Boissel, Winboard Forum, May 08, 2002

=External Links=

Chess Engine

 * [|Fortress] from WBEC Ridderkerk
 * [|Fortress « G 6]
 * [|Downloads] from RWBC by Günther Simon

Chess

 * [|Fortress (chess) from Wikipedia]
 * [|Fortress chess (Variant) from Wikipedia]

Misc

 * [|Fortress (programming language) - Wikipedia]
 * [|Fortification from Wikipedia]
 * [|Fort (disambiguation) from Wikipedia]

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