Fortress, a Chess Engine Communication Protocol compliant chess engine written by Alessandro Damiani in C, first released in October 1998 [1]. Fortress pioneered in Rotated Indices, a deconcentrated version of rotated bitboards. Alessandro once mentioned improving a version of Schrüfer's "most selective" quiescence search [2], found in Schrüfer's Ph.D. thesis Minimax-Suchen [3].
Buhen fortress [4]

Technical Details

• 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

References

1. ^ Fortress from WBEC Ridderkerk
2. ^ futility cut-offs by Alessandro Damiani, rgcc, November 14, 1997
3. ^ Günther Schrüfer (1988). Minimax-Suchen : Kosten, Qualität und Algorithmen. TU Braunschweig (German)
4. ^ Artists impression of the battlements at Buhen fortress in Ancient Egypt about 1800 BC, Source: Franck Monnier (2010). Les forteresses égyptiennes. Du Prédynastique au Nouvel Empire, collection Connaissance de l'Égypte ancienne. Safran (éditions), Bruxelles, 978-2-87457-033-9, Fortification from Wikipedia
5. ^ based on Downloads from RWBC by Günther Simon, Fortress 1.62.zip / readme.doc

What links here?