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VirtuaChess is the commercial version of the [[Écume]] and [[Cumulus|Cumulus 2]] chess programs (which finished second in the blitz tournament in Munich and which tied 2nd/3rd in the [[WCCC 1992|7th World Championships in Madrid]]). It runs on a [[IBM PC|PC]] with [[MS-DOS]] and can use all of the available memory for its [[Transposition Table|hash tables]]. It has a splendid graphical interface written by the French firm [[Titus]] <ref>[https://en.wikipedia.org/wiki/Titus_Software Titus Software]</ref>. Most of the chess engine is written in 32 bit assembler, and the program includes dynamic [[Evaluation|evaluation]] of [[King Safety|king safety]] and [[Pawn Structure|pawn structure]]. It is based on [[Principal Variation Search|PVS]] and uses [[Null Move Pruning|null-move pruning]]. The program has perfect knowledge of [[KPK]] endgames. The evaluation function attempts to build plans whenever it recognizes important features in a position. VirtuaChess runs at 20,000 [[Nodes per Second|nodes per second ]] on a Pentium 90.