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a Dutch computer chess programmer, and author of the [[UCI]] compliant chess engines [[RofChade]] <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68311 New uci engine: Rofchade] by [[Ronald Friederich]], [[CCC]], August 27, 2018</ref> and its experimental spinoff [[PeSTO]] <ref>[https://rofchade.nl/?p=307 PeSTO: Piece Square Tables Only – RofChade]</ref>, which . PeSTO performs a [[Tapered Eval|tapered evaluation]] to interpolate by current [[Game Phases|game stage]] between [[Piece-Square Tables|piece-square tables]] values for [[Opening|opening]] and [[Endgame|endgame]],optimized by [[Texel's Tuning Method|Texel's tuning method]], yielding in mentioned as [[PeSTO's Evaluation Function]].