Author: Jorge Pichard
Date: 16:14:15 11/20/03
Ruffian 2.0 by Per-Ola Valfridsson (Sweden) is the strongest Winboard compatible engine in the world today. The freely available and downloadable version of Ruffian (ver. 1.0.5) is placed first on the Winboard Engines Rating List. Its successor, coming more than one year later, with improved features and much higher playing strength, compared with 1.0.5. Ruffian 2.0 is not only capable of holding his own against the strongest commercial chess programs in the world, but also able to compete successfully against any of them. WB I / II & UCI protocol support Linux engine included 11 playing levels, interesting settings! Opening books by Prof. Dr. Djordje Vidanovic !! Our Chess GUI Arena 1.0 by Martin Blume !! Ruffian 2.0 is a much improved engine that is considerably stronger than version 1.0.1 / 1.0.5. More chess knowledge has been added and many other areas have been enhanced and improved. Piece mobility has been completely rewritten and the new version has a more active positional playing style. The engine is written in portable ANSI C and has been tested on a number of platforms such as Windows, Mac OSX, Linux, Solaris, Pocket PC and PalmOS. Ruffian is a fast program that reaches high search depth very quickly, and this gives it excellent tactical abilities. Extensions, pruning and evaluation have been carefully tuned to maximize Ruffian's playing strength. Mobility is based on precalculated tables that can recognize special patterns; this is one of the major evaluation terms. Ruffian has a lot of endgame knowledge and can play endgames fairly well. With the combination of endgame tables, Ruffian knows when to convert to a winning endgame. Search is based on iterative deepening, principal variation search algorithm (PVS), extension, SEE, transposition tables, recursive null-move and forward pruning.
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