Fortress (Engine)

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Fortress, a Chess Engine Communication Protocol compliant chess engine by Alessandro Damiani, written 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.

=Technical Details=
 * Bitboards Rotated Indices
 * Fail-Soft Alpha-Beta
 * Iterative Deepening
 * Aspiration Windows
 * Null Move Pruning
 * Search Extensions
 * Check Extensions
 * Promotion Threats
 * Piece Threats
 * Transposition Table
 * Killer Heuristic
 * History Heuristic
 * Evaluation mostly calculated incrementally

=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

 * Engine Download List from Ron Murawski's Computer-Chess Wiki
 * Fortress « G 6
 * Fortress 1.62 in CCRL 40/4

Chess

 * Fortress (chess) from Wikipedia
 * Fortress chess (Variant) from Wikipedia

Misc

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

=References= Up one level