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a [[Chess Engine Communication Protocol]] compliant chess engine by [[Alessandro Damiani]], written in [[C]], first released in October 1998 <ref>[http://wbec-ridderkerk.nl/html/details1/Fortress.html Fortress] from [[WBEC|WBEC Ridderkerk]]</ref>. Fortress pioneered in [[Rotated Indices]], a deconcentrated version of [[Rotated Bitboards|rotated bitboards]]. Alessandro once mentioned improving a version of [[Günther Schrüfer|Schrüfer's]] "most selective" [[Quiescence Search|quiescence search]] <ref>[http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/375e65821715995f futility cut-offs] by [[Alessandro Damiani]], [[Computer Chess Forums|rgcc]], November 14, 1997</ref>, found in Schrüfer's Ph.D. thesis ''Minimax-Suchen'' <ref>[[Günther Schrüfer]] ('''1988'''). ''Minimax-Suchen : Kosten, Qualität und Algorithmen''. [https://en.wikipedia.org/wiki/Technical_University_of_Braunschweig TU Braunschweig] (German)</ref>.

<ref>based on Fortress 1.62.zip / readme.doc, [http://www.computer-chess.org/doku.php?id=computer_chess:wiki:download:engine_download_list Engine Download List] from [[Ron Murawski|Ron Murawski's]] [http://computer-chess.org/doku.php?id=home Computer-Chess Wiki], Fortress 1.62.zip / readme.doc</ref>